# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# IMPORTANT:
# Please don't directly include this file if you are building via gyp_chromium,
# since gyp_chromium is automatically forcing its inclusion.
{
  # Variables expected to be overriden on the GYP command line (-D) or by
  # ~/.gyp/include.gypi.
  'variables': {
    # Putting a variables dict inside another variables dict looks kind of
    # weird.  This is done so that 'host_arch', 'chromeos', etc are defined as
    # variables within the outer variables dict here.  This is necessary
    # to get these variables defined for the conditions within this variables
    # dict that operate on these variables.
    'variables': {
      'variables': {
        'variables': {
          'variables': {
            # Whether we're building a ChromeOS build.
            'chromeos%': 0,

            # Whether or not we are using the Aura windowing framework.
            'use_aura%': 0,

            # Whether or not we are building the Ash shell.
            'use_ash%': 0,

            # Use a raw surface abstraction.
            'use_ozone%': 0,
          },
          # Copy conditionally-set variables out one scope.
          'chromeos%': '<(chromeos)',
          'use_aura%': '<(use_aura)',
          'use_ash%': '<(use_ash)',
          'use_ozone%': '<(use_ozone)',

          # Whether we are using Views Toolkit
          'toolkit_views%': 0,

          # Use OpenSSL instead of NSS. Under development: see http://crbug.com/62803
          'use_openssl%': 0,

          # Disable viewport meta tag by default.
          'enable_viewport%': 0,

          # Enable HiDPI support.
          'enable_hidpi%': 0,

          # Enable touch optimized art assets and metrics.
          'enable_touch_ui%': 0,

          # Override buildtype to select the desired build flavor.
          # Dev - everyday build for development/testing
          # Official - release build (generally implies additional processing)
          # TODO(mmoss) Once 'buildtype' is fully supported (e.g. Windows gyp
          # conversion is done), some of the things which are now controlled by
          # 'branding', such as symbol generation, will need to be refactored
          # based on 'buildtype' (i.e. we don't care about saving symbols for
          # non-Official # builds).
          'buildtype%': 'Dev',

          # Override branding to select the desired branding flavor.
          'branding%': 'Chromium',

          'conditions': [
            # ChromeOS implies ash.
            ['chromeos==1', {
              'use_ash%': 1,
              'use_aura%': 1,
            }],

            # For now, Windows builds that |use_aura| should also imply using
            # ash. This rule should be removed for the future when Windows is
            # using the aura windows without the ash interface.
            ['use_aura==1 and OS=="win"', {
              'use_ash%': 1,
            }],
            ['use_ash==1', {
              'use_aura%': 1,
            }],

            # Compute the architecture that we're building on.
            ['OS=="win" or OS=="mac" or OS=="ios"', {
              'host_arch%': 'ia32',
            }, {
              # This handles the Unix platforms for which there is some support.
              # Anything else gets passed through, which probably won't work
              # very well; such hosts should pass an explicit target_arch to
              # gyp.
              'host_arch%':
                '<!(uname -m | sed -e "s/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/;s/i86pc/ia32/")',
            }],
          ],
        },
        # Copy conditionally-set variables out one scope.
        'chromeos%': '<(chromeos)',
        'use_aura%': '<(use_aura)',
        'use_ash%': '<(use_ash)',
        'use_ozone%': '<(use_ozone)',
        'use_openssl%': '<(use_openssl)',
        'enable_viewport%': '<(enable_viewport)',
        'enable_hidpi%': '<(enable_hidpi)',
        'enable_touch_ui%': '<(enable_touch_ui)',
        'buildtype%': '<(buildtype)',
        'branding%': '<(branding)',
        'host_arch%': '<(host_arch)',

        # Default architecture we're building for is the architecture we're
        # building on.
        'target_arch%': '<(host_arch)',

        # This is set when building the Android WebView inside the Android
        # build system, using the 'android' gyp backend. The WebView code is
        # still built when this is unset, but builds using the normal chromium
        # build system.
        'android_webview_build%': 0,

        # Sets whether chrome is built for google tv device.
        'google_tv%': 0,

        # Set ARM architecture version.
        'arm_version%': 7,

        'conditions': [
          # Set default value of toolkit_views based on OS.
          ['OS=="win" or chromeos==1 or use_aura==1', {
            'toolkit_views%': 1,
          }, {
            'toolkit_views%': 0,
          }],

          # Set toolkit_uses_gtk for the Chromium browser on Linux.
          ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and use_aura==0 and use_ozone==0', {
            'toolkit_uses_gtk%': 1,
          }, {
            'toolkit_uses_gtk%': 0,
          }],

          # Enable HiDPI on Mac OS and Chrome OS.
          ['OS=="mac" or chromeos==1', {
            'enable_hidpi%': 1,
          }],

          # Enable touch UI on Metro.
          ['OS=="win"', {
            'enable_touch_ui%': 1,
          }],

          # Enable App Launcher only on ChromeOS, Windows and OSX.
          ['use_ash==1 or OS=="win" or OS=="mac"', {
            'enable_app_list%': 1,
          }, {
            'enable_app_list%': 0,
          }],

          ['use_aura==1 or (OS!="win" and OS!="mac" and OS!="ios" and OS!="android")', {
            'use_default_render_theme%': 1,
          }, {
            'use_default_render_theme%': 0,
          }],

          # TODO(thestig) Remove the linux_lsb_release check after all the
          # official Ubuntu Lucid builder are gone.
          ['OS=="linux" and branding=="Chrome" and buildtype=="Official" and chromeos==0', {
            'linux_lsb_release%': '<!(lsb_release -r -s)',
          }, {
            'linux_lsb_release%': '',
          }], # OS=="linux" and branding=="Chrome" and buildtype=="Official" and chromeos==0
        ],
      },

      # Copy conditionally-set variables out one scope.
      'chromeos%': '<(chromeos)',
      'host_arch%': '<(host_arch)',
      'target_arch%': '<(target_arch)',
      'toolkit_views%': '<(toolkit_views)',
      'toolkit_uses_gtk%': '<(toolkit_uses_gtk)',
      'use_aura%': '<(use_aura)',
      'use_ash%': '<(use_ash)',
      'use_ozone%': '<(use_ozone)',
      'use_openssl%': '<(use_openssl)',
      'enable_viewport%': '<(enable_viewport)',
      'enable_hidpi%': '<(enable_hidpi)',
      'enable_touch_ui%': '<(enable_touch_ui)',
      'android_webview_build%': '<(android_webview_build)',
      'google_tv%': '<(google_tv)',
      'enable_app_list%': '<(enable_app_list)',
      'use_default_render_theme%': '<(use_default_render_theme)',
      'buildtype%': '<(buildtype)',
      'branding%': '<(branding)',
      'arm_version%': '<(arm_version)',
      'linux_lsb_release%': '<(linux_lsb_release)',

      # Set to 1 to enable fast builds. Set to 2 for even faster builds
      # (it disables debug info for fastest compilation - only for use
      # on compile-only bots).
      'fastbuild%': 0,

      # Set to 1 to enable dcheck in release without having to use the flag.
      'dcheck_always_on%': 0,

      # Disable file manager component extension by default.
      'file_manager_extension%': 0,

      # Disable image loader component extension by default.
      'image_loader_extension%': 0,

      # Python version.
      'python_ver%': '2.6',


      # Set NEON compilation flags.
      'arm_neon%': 1,

      # Detect NEON support at run-time.
      'arm_neon_optional%': 0,

      # The system root for cross-compiles. Default: none.
      'sysroot%': '',

      # The system libdir used for this ABI.
      'system_libdir%': 'lib',

      # On Linux, we build with sse2 for Chromium builds.
      'disable_sse2%': 0,

      # Use libjpeg-turbo as the JPEG codec used by Chromium.
      'use_libjpeg_turbo%': 1,

      # Use system libjpeg. Note that the system's libjepg will be used even if
      # use_libjpeg_turbo is set.
      'use_system_libjpeg%': 0,

      # By default, component is set to static_library and it can be overriden
      # by the GYP command line or by ~/.gyp/include.gypi.
      'component%': 'static_library',

      # Set to select the Title Case versions of strings in GRD files.
      'use_titlecase_in_grd_files%': 0,

      # Use translations provided by volunteers at launchpad.net.  This
      # currently only works on Linux.
      'use_third_party_translations%': 0,

      # Remoting compilation is enabled by default. Set to 0 to disable.
      'remoting%': 1,

      # Configuration policy is enabled by default. Set to 0 to disable.
      'configuration_policy%': 1,

      # Variable safe_browsing is used to control the build time configuration
      # for safe browsing feature. Safe browsing can be compiled in 3 different
      # levels: 0 disables it, 1 enables it fully, and 2 enables only UI and
      # reporting features without enabling phishing and malware detection. This
      # is useful to integrate a third party phishing/malware detection to
      # existing safe browsing logic.
      'safe_browsing%': 1,

      # Speech input is compiled in by default. Set to 0 to disable.
      'input_speech%': 1,

      # Notifications are compiled in by default. Set to 0 to disable.
      'notifications%' : 1,

      # Use dsymutil to generate real .dSYM files on Mac. The default is 0 for
      # regular builds and 1 for ASan builds.
      'mac_want_real_dsym%': 'default',

      # If this is set, the clang plugins used on the buildbot will be used.
      # Run tools/clang/scripts/update.sh to make sure they are compiled.
      # This causes 'clang_chrome_plugins_flags' to be set.
      # Has no effect if 'clang' is not set as well.
      'clang_use_chrome_plugins%': 1,

      # Enable building with ASAN (Clang's -fsanitize=address option).
      # -fsanitize=address only works with clang, but asan=1 implies clang=1
      # See https://sites.google.com/a/chromium.org/dev/developers/testing/addresssanitizer
      'asan%': 0,

      # Enable building with TSAN (Clang's -fsanitize=thread option).
      # -fsanitize=thread only works with clang, but tsan=1 implies clang=1
      # See http://clang.llvm.org/docs/ThreadSanitizer.html
      'tsan%': 0,
      'tsan_blacklist%': '<(PRODUCT_DIR)/../../tools/valgrind/tsan_v2/ignores.txt',

      # Enable building with MSAN (Clang's -fsanitize=memory option).
      # MemorySanitizer only works with clang, but msan=1 implies clang=1
      # See http://clang.llvm.org/docs/MemorySanitizer.html
      'msan%': 0,

      # Use a modified version of Clang to intercept allocated types and sizes
      # for allocated objects. clang_type_profiler=1 implies clang=1.
      # See http://dev.chromium.org/developers/deep-memory-profiler/cpp-object-type-identifier
      # TODO(dmikurube): Support mac.  See http://crbug.com/123758#c11
      'clang_type_profiler%': 0,

      # Set to true to instrument the code with function call logger.
      # See src/third_party/cygprofile/cyg-profile.cc for details.
      'order_profiling%': 0,

      # Use the provided profiled order file to link Chrome image with it.
      # This makes Chrome faster by better using CPU cache when executing code.
      # This is known as PGO (profile guided optimization).
      # See https://sites.google.com/a/google.com/chrome-msk/dev/boot-speed-up-effort
      'order_text_section%' : "",

      # Set to 1 compile with -fPIC cflag on linux. This is a must for shared
      # libraries on linux x86-64 and arm, plus ASLR.
      'linux_fpic%': 1,

      # Whether one-click signin is enabled or not.
      'enable_one_click_signin%': 0,

      # Enable Chrome browser extensions
      'enable_extensions%': 1,

      # Enable browser automation.
      'enable_automation%': 1,

      # Enable Google Now.
      'enable_google_now%': 1,

      # Enable language detection.
      'enable_language_detection%': 1,

      # Enable printing support and UI.
      'enable_printing%': 1,

      # Webrtc compilation is enabled by default. Set to 0 to disable.
      'enable_webrtc%': 1,

      # Enables use of the session service, which is enabled by default.
      # Support for disabling depends on the platform.
      'enable_session_service%': 1,

      # Enables theme support, which is enabled by default.  Support for
      # disabling depends on the platform.
      'enable_themes%': 1,

      # Enables autofill dialog and associated features; disabled by default.
      'enable_autofill_dialog%' : 0,

      # Uses spring wallpaper resources on Spring.
      'use_spring_wallpaper%': 0,

      # Uses OEM-specific wallpaper resources on Chrome OS.
      'use_oem_wallpaper%': 0,

      # Enables support for background apps.
      'enable_background%': 1,

      # Enable the task manager by default.
      'enable_task_manager%': 1,

      # Enable FTP support by default.
      'disable_ftp_support%': 0,

      # XInput2 multitouch support is disabled by default (use_xi2_mt=0).
      # Setting to non-zero value enables XI2 MT. When XI2 MT is enabled,
      # the input value also defines the required XI2 minor minimum version.
      # For example, use_xi2_mt=2 means XI2.2 or above version is required.
      'use_xi2_mt%': 0,

      # Use of precompiled headers on Windows.
      #
      # This variable may be explicitly set to 1 (enabled) or 0
      # (disabled) in ~/.gyp/include.gypi or via the GYP command line.
      # This setting will override the default.
      #
      # See
      # http://code.google.com/p/chromium/wiki/WindowsPrecompiledHeaders
      # for details.
      'chromium_win_pch%': 0,

      # Set this to true when building with Clang.
      # See http://code.google.com/p/chromium/wiki/Clang for details.
      'clang%': 0,

      # Enable plug-in installation by default.
      'enable_plugin_installation%': 1,

      # Enable PPAPI and NPAPI by default.
      # TODO(nileshagrawal): Make this flag enable/disable NPAPI as well
      # as PPAPI; see crbug.com/162667.
      'enable_plugins%': 1,

      # Specifies whether to use canvas_skia.cc in place of platform
      # specific implementations of gfx::Canvas. Affects text drawing in the
      # Chrome UI.
      # TODO(asvitkine): Enable this on all platforms and delete this flag.
      #                  http://crbug.com/105550
      'use_canvas_skia%': 0,

      # Set to "tsan", "memcheck", or "drmemory" to configure the build to work
      # with one of those tools.
      'build_for_tool%': '',

      # If no directory is specified then a temporary directory will be used.
      'test_isolation_outdir%': '',
      # True if isolate should fail if the isolate files refer to files
      # that are missing.
      'test_isolation_fail_on_missing': 0,

      'sas_dll_path%': '<(DEPTH)/third_party/platformsdk_win7/files/redist/x86',
      'wix_path%': '<(DEPTH)/third_party/wix',

      # Managed users are enabled by default.
      'enable_managed_users%': 1,

      'spdy_proxy_auth_origin%' : '',
      'spdy_proxy_auth_property%' : '',
      'spdy_proxy_auth_value%' : '',

      'conditions': [
        # A flag for POSIX platforms
        ['OS=="win"', {
          'os_posix%': 0,
        }, {
          'os_posix%': 1,
        }],

        # A flag for BSD platforms
        ['OS=="freebsd" or OS=="openbsd"', {
          'os_bsd%': 1,
        }, {
          'os_bsd%': 0,
        }],

        # Set armv7 for backward compatibility.
        ['arm_version==7', {
          'armv7': 1,
        }, {
          'armv7': 0,
        }],

        # NSS usage.
        ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and use_openssl==0', {
          'use_nss%': 1,
        }, {
          'use_nss%': 0,
        }],

        # Flags to use X11 on non-Mac POSIX platforms.
        ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android" or use_ozone==1', {
          'use_x11%': 0,
        }, {
          'use_x11%': 1,
        }],

        # Flags to use pango and glib on non-Mac POSIX platforms.
        ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android"', {
          'use_glib%': 0,
          'use_pango%': 0,
        }, {
          'use_glib%': 1,
          'use_pango%': 1,
        }],

        # We always use skia text rendering in Aura on Windows, since GDI
        # doesn't agree with our BackingStore.
        # TODO(beng): remove once skia text rendering is on by default.
        ['use_aura==1 and OS=="win"', {
          'enable_skia_text%': 1,
        }],

        # A flag to enable or disable our compile-time dependency
        # on gnome-keyring. If that dependency is disabled, no gnome-keyring
        # support will be available. This option is useful
        # for Linux distributions and for Aura.
        ['chromeos==1 or use_aura==1', {
          'use_gnome_keyring%': 0,
        }, {
          'use_gnome_keyring%': 1,
        }],

        ['toolkit_uses_gtk==1 or OS=="mac" or OS=="ios"', {
          # GTK+, Mac and iOS want Title Case strings
          'use_titlecase_in_grd_files%': 1,
        }],

        # Enable file manager and image loader extensions on Chrome OS.
        ['chromeos==1', {
          'file_manager_extension%': 1,
          'image_loader_extension%': 1,
        }, {
          'file_manager_extension%': 0,
          'image_loader_extension%': 0,
        }],

        ['OS=="win" or OS=="mac" or (OS=="linux" and chromeos==0)', {
          'enable_one_click_signin%': 1,
        }],

        ['OS=="android"', {
          'enable_automation%': 0,
          'enable_extensions%': 0,
          'enable_google_now%': 0,
          'enable_language_detection%': 1,
          'enable_printing%': 0,
          'enable_themes%': 0,
          'proprietary_codecs%': 1,
          'remoting%': 0,
          'arm_neon%': 0,
          'arm_neon_optional%': 1,
        }],

        # Enable autofill dialog for Android and Views-enabled platforms for now.
        ['toolkit_views==1 or (OS=="android" and android_webview_build==0) or OS=="mac"', {
          'enable_autofill_dialog%': 1
        }],

        ['OS=="android" and android_webview_build==0', {
          'enable_webrtc%': 1,
        }],

        # Disable WebRTC for building WebView as part of Android system.
        # TODO(boliu): Decide if we want WebRTC, and if so, also merge
        # the necessary third_party repositories.
        ['OS=="android" and android_webview_build==1', {
          'enable_webrtc%': 0,
        }],

        ['OS=="ios"', {
          'configuration_policy%': 0,
          'disable_ftp_support%': 1,
          'enable_automation%': 0,
          'enable_extensions%': 0,
          'enable_google_now%': 0,
          'enable_language_detection%': 0,
          'enable_printing%': 0,
          'enable_session_service%': 0,
          'enable_themes%': 0,
          'enable_webrtc%': 0,
          'notifications%': 0,
          'remoting%': 0,
          'safe_browsing%': 0,
          'enable_managed_users%': 0,
        }],

        # Use GPU accelerated cross process image transport by default
        # on linux builds with the Aura window manager
        ['use_aura==1 and OS=="linux"', {
          'ui_compositor_image_transport%': 1,
        }, {
          'ui_compositor_image_transport%': 0,
        }],

        # Turn precompiled headers on by default.
        ['OS=="win" and buildtype!="Official"', {
          'chromium_win_pch%': 1
        }],

        ['chromeos==1 or OS=="android" or OS=="ios"', {
          'enable_plugin_installation%': 0,
        }, {
          'enable_plugin_installation%': 1,
        }],

        ['(OS=="android" and google_tv!=1) or OS=="ios"', {
          'enable_plugins%': 0,
        }, {
          'enable_plugins%': 1,
        }],

        # linux_use_gold_binary: whether to use the binary checked into
        # third_party/gold.  Gold is not used for 32-bit linux builds
        # as it runs out of address space.
        ['OS=="linux" and (target_arch=="x64" or target_arch=="arm")', {
          'linux_use_gold_binary%': 1,
        }, {
          'linux_use_gold_binary%': 0,
        }],

        # linux_use_gold_flags: whether to use build flags that rely on gold.
        # On by default for x64 Linux.  Temporarily off for ChromeOS as
        # it failed on a buildbot.
        ['OS=="linux" and target_arch=="x64" and chromeos==0', {
          'linux_use_gold_flags%': 1,
        }, {
          'linux_use_gold_flags%': 0,
        }],

        ['chromeos==1', {
          'linux_use_libgps%': 1,
        }, { # chromeos==0
          # Do not use libgps on desktop Linux by default,
          # see http://crbug.com/103751.
          'linux_use_libgps%': 0,
        }],

        ['OS=="android" or OS=="ios"', {
          'enable_captive_portal_detection%': 0,
        }, {
          'enable_captive_portal_detection%': 1,
        }],

        # Enable Skia UI text drawing incrementally on different platforms.
        # http://crbug.com/105550
        #
        # On Aura, this allows per-tile painting to be used in the browser
        # compositor.
        ['OS!="mac" and OS!="android"', {
          'use_canvas_skia%': 1,
        }],

        ['chromeos==1', {
          # When building for ChromeOS we dont want Chromium to use libjpeg_turbo.
          'use_libjpeg_turbo%': 0,
        }],

        ['OS=="android"', {
          # When building as part of the Android system, use system libraries
          # where possible to reduce ROM size.
          'use_system_libjpeg%': '<(android_webview_build)',
        }],

        # Enable Settings App only on Windows.
        ['enable_app_list==1 and OS=="win"', {
          'enable_settings_app%': 1,
        }, {
          'enable_settings_app%': 0,
        }],

        ['OS=="linux" and target_arch=="arm" and chromeos==0', {
          # Set some defaults for arm/linux chrome builds
          'linux_breakpad%': 0,
          'linux_use_tcmalloc%': 0,
          # sysroot needs to be an absolute path otherwise it generates
          # incorrect results when passed to pkg-config
          'sysroot%': '<!(cd <(DEPTH) && pwd -P)/arm-sysroot',
        }], # OS=="linux" and target_arch=="arm" and chromeos==0

        ['linux_lsb_release=="12.04"', {
          'conditions': [
            ['target_arch=="x64"', {
              'sysroot%': '<!(cd <(DEPTH) && pwd -P)/chrome/installer/linux/debian_wheezy_amd64-sysroot',
            }],
            ['target_arch=="ia32"', {
              'sysroot%': '<!(cd <(DEPTH) && pwd -P)/chrome/installer/linux/debian_wheezy_i386-sysroot',
            }],
        ],
        }], # linux_lsb_release=="12.04"

        ['target_arch=="mipsel"', {
          'sysroot%': '<!(cd <(DEPTH) && pwd -P)/mipsel-sysroot/sysroot',
          'CXX%': '<!(cd <(DEPTH) && pwd -P)/mipsel-sysroot/bin/mipsel-linux-gnu-gcc',
        }],

        # Whether tests targets should be run, archived or just have the
        # dependencies verified. All the tests targets have the '_run' suffix,
        # e.g. base_unittests_run runs the target base_unittests. The test
        # target always calls tools/swarm_client/isolate.py. See the script's
        # --help for more information and the valid --mode values. Meant to be
        # overriden with GYP_DEFINES.
        # TODO(maruel): Remove the conditions as more configurations are
        # supported.
        # TODO(csharp): Remove OS!="mac" once xcode can run the isolate code
        # again.
        # NOTE: The check for disable_nacl==0 and component=="static_library"
        # can't be used here because these variables are not defined yet, but it
        # is still not supported.
        ['OS!="mac" and OS!="ios" and OS!="android" and chromeos==0', {
          'test_isolation_mode%': 'check',
        }, {
          'test_isolation_mode%': 'noop',
        }],
        # Whether Android ARM build uses OpenMAX DL FFT.
        ['OS=="android" and target_arch=="arm" and android_webview_build==0', {
          # Currently only supported on Android ARM, without webview.
          # When enabled, this will also enable WebAudio on Android
          # ARM.  Default is enabled.
          'use_openmax_dl_fft%': 1,
        }, {
          'use_openmax_dl_fft%': 0,
        }],
      ],

      # Set this to 1 to enable use of concatenated impulse responses
      # for the HRTF panner in WebAudio.
      'use_concatenated_impulse_responses': 1,

      # You can set the variable 'use_official_google_api_keys' to 1
      # to use the Google-internal file containing official API keys
      # for Google Chrome even in a developer build.  Setting this
      # variable explicitly to 1 will cause your build to fail if the
      # internal file is missing.
      #
      # The variable is documented here, but not handled in this file;
      # see //google_apis/determine_use_official_keys.gypi for the
      # implementation.
      #
      # Set the variable to 0 to not use the internal file, even when
      # it exists in your checkout.
      #
      # Leave it unset in your include.gypi to have the variable
      # implicitly set to 1 if you have
      # src/google_apis/internal/google_chrome_api_keys.h in your
      # checkout, and implicitly set to 0 if not.
      #
      # Note that official builds always behave as if the variable
      # was explicitly set to 1, i.e. they always use official keys,
      # and will fail to build if the internal file is missing.
      #
      # NOTE: You MUST NOT explicitly set the variable to 2 in your
      # include.gypi or by other means. Due to subtleties of GYP, this
      # is not the same as leaving the variable unset, even though its
      # default value in
      # //google_apis/determine_use_official_keys.gypi is 2.

      # Set these to bake the specified API keys and OAuth client
      # IDs/secrets into your build.
      #
      # If you create a build without values baked in, you can instead
      # set environment variables to provide the keys at runtime (see
      # src/google_apis/google_api_keys.h for details).  Features that
      # require server-side APIs may fail to work if no keys are
      # provided.
      #
      # Note that if you are building an official build or if
      # use_official_google_api_keys has been set to 1 (explicitly or
      # implicitly), these values will be ignored and the official
      # keys will be used instead.
      'google_api_key%': '',
      'google_default_client_id%': '',
      'google_default_client_secret%': '',
    },

    # Copy conditionally-set variables out one scope.
    'branding%': '<(branding)',
    'buildtype%': '<(buildtype)',
    'target_arch%': '<(target_arch)',
    'host_arch%': '<(host_arch)',
    'toolkit_views%': '<(toolkit_views)',
    'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
    'use_aura%': '<(use_aura)',
    'use_ash%': '<(use_ash)',
    'use_openssl%': '<(use_openssl)',
    'use_nss%': '<(use_nss)',
    'os_bsd%': '<(os_bsd)',
    'os_posix%': '<(os_posix)',
    'use_glib%': '<(use_glib)',
    'use_pango%': '<(use_pango)',
    'use_ozone%': '<(use_ozone)',
    'toolkit_uses_gtk%': '<(toolkit_uses_gtk)',
    'use_x11%': '<(use_x11)',
    'use_gnome_keyring%': '<(use_gnome_keyring)',
    'linux_fpic%': '<(linux_fpic)',
    'chromeos%': '<(chromeos)',
    'enable_viewport%': '<(enable_viewport)',
    'enable_hidpi%': '<(enable_hidpi)',
    'enable_touch_ui%': '<(enable_touch_ui)',
    'use_xi2_mt%':'<(use_xi2_mt)',
    'file_manager_extension%': '<(file_manager_extension)',
    'image_loader_extension%': '<(image_loader_extension)',
    'fastbuild%': '<(fastbuild)',
    'dcheck_always_on%': '<(dcheck_always_on)',
    'python_ver%': '<(python_ver)',
    'arm_version%': '<(arm_version)',
    'armv7%': '<(armv7)',
    'arm_neon%': '<(arm_neon)',
    'arm_neon_optional%': '<(arm_neon_optional)',
    'sysroot%': '<(sysroot)',
    'system_libdir%': '<(system_libdir)',
    'component%': '<(component)',
    'use_titlecase_in_grd_files%': '<(use_titlecase_in_grd_files)',
    'use_third_party_translations%': '<(use_third_party_translations)',
    'remoting%': '<(remoting)',
    'enable_one_click_signin%': '<(enable_one_click_signin)',
    'enable_webrtc%': '<(enable_webrtc)',
    'chromium_win_pch%': '<(chromium_win_pch)',
    'configuration_policy%': '<(configuration_policy)',
    'safe_browsing%': '<(safe_browsing)',
    'input_speech%': '<(input_speech)',
    'notifications%': '<(notifications)',
    'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
    'mac_want_real_dsym%': '<(mac_want_real_dsym)',
    'asan%': '<(asan)',
    'msan%': '<(msan)',
    'tsan%': '<(tsan)',
    'tsan_blacklist%': '<(tsan_blacklist)',
    'clang_type_profiler%': '<(clang_type_profiler)',
    'order_profiling%': '<(order_profiling)',
    'order_text_section%': '<(order_text_section)',
    'enable_extensions%': '<(enable_extensions)',
    'enable_plugin_installation%': '<(enable_plugin_installation)',
    'enable_plugins%': '<(enable_plugins)',
    'enable_session_service%': '<(enable_session_service)',
    'enable_themes%': '<(enable_themes)',
    'enable_autofill_dialog%': '<(enable_autofill_dialog)',
    'use_spring_wallpaper%': '<(use_spring_wallpaper)',
    'use_oem_wallpaper%': '<(use_oem_wallpaper)',
    'enable_background%': '<(enable_background)',
    'linux_use_gold_binary%': '<(linux_use_gold_binary)',
    'linux_use_gold_flags%': '<(linux_use_gold_flags)',
    'linux_use_libgps%': '<(linux_use_libgps)',
    'use_canvas_skia%': '<(use_canvas_skia)',
    'test_isolation_mode%': '<(test_isolation_mode)',
    'test_isolation_outdir%': '<(test_isolation_outdir)',
    'test_isolation_fail_on_missing': '<(test_isolation_fail_on_missing)',
    'enable_automation%': '<(enable_automation)',
    'enable_printing%': '<(enable_printing)',
    'enable_google_now%': '<(enable_google_now)',
    'enable_language_detection%': '<(enable_language_detection)',
    'enable_captive_portal_detection%': '<(enable_captive_portal_detection)',
    'disable_ftp_support%': '<(disable_ftp_support)',
    'enable_task_manager%': '<(enable_task_manager)',
    'sas_dll_path%': '<(sas_dll_path)',
    'wix_path%': '<(wix_path)',
    'use_libjpeg_turbo%': '<(use_libjpeg_turbo)',
    'use_system_libjpeg%': '<(use_system_libjpeg)',
    'android_webview_build%': '<(android_webview_build)',
    'gyp_managed_install%': 0,
    'google_tv%': '<(google_tv)',
    'enable_app_list%': '<(enable_app_list)',
    'use_default_render_theme%': '<(use_default_render_theme)',
    'enable_settings_app%': '<(enable_settings_app)',
    'google_api_key%': '<(google_api_key)',
    'google_default_client_id%': '<(google_default_client_id)',
    'google_default_client_secret%': '<(google_default_client_secret)',
    'enable_managed_users%': '<(enable_managed_users)',
    'spdy_proxy_auth_origin%': '<(spdy_proxy_auth_origin)',
    'spdy_proxy_auth_property%': '<(spdy_proxy_auth_property)',
    'spdy_proxy_auth_value%': '<(spdy_proxy_auth_value)',

    # Use system mesa instead of bundled one.
    'use_system_mesa%': 0,

    # Use system nspr instead of the bundled one.
    'use_system_nspr%': 0,

    # Use system protobuf instead of bundled one.
    'use_system_protobuf%': 0,

    # Use system yasm instead of bundled one.
    'use_system_yasm%': 0,

    # Use system ICU instead of bundled one.
    'use_system_icu%' : 0,

    # Default to enabled PIE; this is important for ASLR but we may need to be
    # able to turn it off for various reasons.
    'linux_disable_pie%': 0,

    # The release channel that this build targets. This is used to restrict
    # channel-specific build options, like which installer packages to create.
    # The default is 'all', which does no channel-specific filtering.
    'channel%': 'all',

    # Override chromium_mac_pch and set it to 0 to suppress the use of
    # precompiled headers on the Mac.  Prefix header injection may still be
    # used, but prefix headers will not be precompiled.  This is useful when
    # using distcc to distribute a build to compile slaves that don't
    # share the same compiler executable as the system driving the compilation,
    # because precompiled headers rely on pointers into a specific compiler
    # executable's image.  Setting this to 0 is needed to use an experimental
    # Linux-Mac cross compiler distcc farm.
    'chromium_mac_pch%': 1,

    # The default value for mac_strip in target_defaults. This cannot be
    # set there, per the comment about variable% in a target_defaults.
    'mac_strip_release%': 1,

    # Set to 1 to enable code coverage.  In addition to build changes
    # (e.g. extra CFLAGS), also creates a new target in the src/chrome
    # project file called "coverage".
    # Currently ignored on Windows.
    'coverage%': 0,

    # Set to 1 to force Visual C++ to use legacy debug information format /Z7.
    # This is useful for parallel compilation tools which can't support /Zi.
    # Only used on Windows.
    'win_z7%' : 0,

    # Although base/allocator lets you select a heap library via an
    # environment variable, the libcmt shim it uses sometimes gets in
    # the way.  To disable it entirely, and switch to normal msvcrt, do e.g.
    #  'win_use_allocator_shim': 0,
    #  'win_release_RuntimeLibrary': 2
    # to ~/.gyp/include.gypi, gclient runhooks --force, and do a release build.
    'win_use_allocator_shim%': 1, # 1 = shim allocator via libcmt; 0 = msvcrt

    # Whether usage of OpenMAX is enabled.
    'enable_openmax%': 0,

    # Whether proprietary audio/video codecs are assumed to be included with
    # this build (only meaningful if branding!=Chrome).
    'proprietary_codecs%': 0,

    # TODO(bradnelson): eliminate this when possible.
    # To allow local gyp files to prevent release.vsprops from being included.
    # Yes(1) means include release.vsprops.
    # Once all vsprops settings are migrated into gyp, this can go away.
    'msvs_use_common_release%': 1,

    # TODO(bradnelson): eliminate this when possible.
    # To allow local gyp files to override additional linker options for msvs.
    # Yes(1) means set use the common linker options.
    'msvs_use_common_linker_extras%': 1,

    # TODO(sgk): eliminate this if possible.
    # It would be nicer to support this via a setting in 'target_defaults'
    # in chrome/app/locales/locales.gypi overriding the setting in the
    # 'Debug' configuration in the 'target_defaults' dict below,
    # but that doesn't work as we'd like.
    'msvs_debug_link_incremental%': '2',

    # Needed for some of the largest modules.
    'msvs_debug_link_nonincremental%': '1',

    # Turns on Use Library Dependency Inputs for linking chrome.dll on Windows
    # to get incremental linking to be faster in debug builds.
    'incremental_chrome_dll%': '0',

    # Experimental setting to break chrome.dll in to multiple parts (currently
    # two, split primarily along browser/render lines).
    'chrome_split_dll%': '0',

    # The default settings for third party code for treating
    # warnings-as-errors. Ideally, this would not be required, however there
    # is some third party code that takes a long time to fix/roll. So, this
    # flag allows us to have warnings as errors in general to prevent
    # regressions in most modules, while working on the bits that are
    # remaining.
    'win_third_party_warn_as_error%': 'true',

    # This is the location of the sandbox binary. Chrome looks for this before
    # running the zygote process. If found, and SUID, it will be used to
    # sandbox the zygote process and, thus, all renderer processes.
    'linux_sandbox_path%': '',

    # Clang stuff.
    'clang%': '<(clang)',
    'make_clang_dir%': 'third_party/llvm-build/Release+Asserts',

    # These two variables can be set in GYP_DEFINES while running
    # |gclient runhooks| to let clang run a plugin in every compilation.
    # Only has an effect if 'clang=1' is in GYP_DEFINES as well.
    # Example:
    #     GYP_DEFINES='clang=1 clang_load=/abs/path/to/libPrintFunctionNames.dylib clang_add_plugin=print-fns' gclient runhooks

    'clang_load%': '',
    'clang_add_plugin%': '',

    # The default type of gtest.
    'gtest_target_type%': 'executable',

    # Enable sampling based profiler.
    # See http://google-perftools.googlecode.com/svn/trunk/doc/cpuprofile.html
    'profiling%': '0',

    # Enable strict glibc debug mode.
    'glibcxx_debug%': 0,
    # Compile in Breakpad support by default so that it can be tested,
    # even if it not enabled by default at runtime.
    'linux_breakpad%': 1,
    # And if we want to dump symbols for Breakpad-enabled builds.
    'linux_dump_symbols%': 0,
    # And if we want to strip the binary after dumping symbols.
    'linux_strip_binary%': 0,
    # Strip the test binaries needed for Linux reliability tests.
    'linux_strip_reliability_tests%': 0,

    # Enable TCMalloc.
    'linux_use_tcmalloc%': 1,
    'android_use_tcmalloc%': 0,

    # Disable TCMalloc's heapchecker.
    'linux_use_heapchecker%': 0,

    # Disable shadow stack keeping used by heapcheck to unwind the stacks
    # better.
    'linux_keep_shadow_stacks%': 0,

    # Set to 1 to link against libgnome-keyring instead of using dlopen().
    'linux_link_gnome_keyring%': 0,
    # Set to 1 to link against gsettings APIs instead of using dlopen().
    'linux_link_gsettings%': 0,

    # Default arch variant for MIPS.
    'mips_arch_variant%': 'mips32r2',

    # Enable use of OpenMAX DL FFT routines.
    'use_openmax_dl_fft%': '<(use_openmax_dl_fft)',

    # Enable new NPDevice API.
    'enable_new_npdevice_api%': 0,

    # Enable EGLImage support in OpenMAX
    'enable_eglimage%': 1,

    # Enable a variable used elsewhere throughout the GYP files to determine
    # whether to compile in the sources for the GPU plugin / process.
    'enable_gpu%': 1,

    # .gyp files or targets should set chromium_code to 1 if they build
    # Chromium-specific code, as opposed to external code.  This variable is
    # used to control such things as the set of warnings to enable, and
    # whether warnings are treated as errors.
    'chromium_code%': 0,

    'release_valgrind_build%': 0,

    # TODO(thakis): Make this a blacklist instead, http://crbug.com/101600
    'enable_wexit_time_destructors%': 0,

    # Set to 1 to compile with the built in pdf viewer.
    'internal_pdf%': 0,

    # Set to 1 to compile with the OpenGL ES 2.0 conformance tests.
    'internal_gles2_conform_tests%': 0,

    # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'
    # so Cocoa is happy (http://crbug.com/20441).
    'locales': [
      'am', 'ar', 'bg', 'bn', 'ca', 'cs', 'da', 'de', 'el', 'en-GB',
      'en-US', 'es-419', 'es', 'et', 'fa', 'fi', 'fil', 'fr', 'gu', 'he',
      'hi', 'hr', 'hu', 'id', 'it', 'ja', 'kn', 'ko', 'lt', 'lv',
      'ml', 'mr', 'ms', 'nb', 'nl', 'pl', 'pt-BR', 'pt-PT', 'ro', 'ru',
      'sk', 'sl', 'sr', 'sv', 'sw', 'ta', 'te', 'th', 'tr', 'uk',
      'vi', 'zh-CN', 'zh-TW',
    ],

    # Pseudo locales are special locales which are used for testing and
    # debugging. They don't get copied to the final app. For more info,
    # check out https://sites.google.com/a/chromium.org/dev/Home/fake-bidi
    'pseudo_locales': [
      'fake-bidi',
    ],

    'grit_defines': [],

    # If debug_devtools is set to 1, JavaScript files for DevTools are
    # stored as is and loaded from disk. Otherwise, a concatenated file
    # is stored in resources.pak. It is still possible to load JS files
    # from disk by passing --debug-devtools cmdline switch.
    'debug_devtools%': 0,

    # The Java Bridge is not compiled in by default.
    'java_bridge%': 0,

    # Code signing for iOS binaries.  The bots need to be able to disable this.
    'chromium_ios_signing%': 1,

    # This flag is only used when disable_nacl==0 and disables all those
    # subcomponents which would require the installation of a native_client
    # untrusted toolchain.
    'disable_nacl_untrusted%': 0,

    # Disable Dart by default.
    'enable_dart%': 0,

    # The desired version of Windows SDK can be set in ~/.gyp/include.gypi.
    'msbuild_toolset%': '',

    # Native Client is enabled by default.
    'disable_nacl%': 0,

    # Portable Native Client is enabled by default.
    'disable_pnacl%': 0,

    # Whether to build full debug version for Debug configuration on Android.
    # Compared to full debug version, the default Debug configuration on Android
    # has no full v8 debug, has size optimization and linker gc section, so that
    # we can build a debug version with acceptable size and performance.
    'android_full_debug%': 0,

    # Sets the default version name and code for Android app, by default we
    # do a developer build.
    'android_app_version_name%': 'Developer Build',
    'android_app_version_code%': 0,

    'sas_dll_exists': '<!(python <(DEPTH)/build/dir_exists.py <(sas_dll_path))',
    'wix_exists': '<!(python <(DEPTH)/build/dir_exists.py <(wix_path))',

    'windows_sdk_default_path': '<(DEPTH)/third_party/platformsdk_win8/files',
    'directx_sdk_default_path': '<(DEPTH)/third_party/directxsdk/files',

    # Whether we are using the rlz library or not.  Platforms like Android send
    # rlz codes for searches but do not use the library.
    'enable_rlz%': 0,

    # MDNS is disabled by default.
    'enable_mdns%' : 0,

    'conditions': [
      # The version of GCC in use, set later in platforms that use GCC and have
      # not explicitly chosen to build with clang. Currently, this means all
      # platforms except Windows, Mac and iOS.
      # TODO(glider): set clang to 1 earlier for ASan and TSan builds so that
      # it takes effect here.
      ['os_posix==1 and OS!="mac" and OS!="ios" and clang==0 and asan==0 and tsan==0 and msan==0', {
        'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
      }, {
        'gcc_version%': 0,
      }],
      ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(windows_sdk_default_path))"=="True"', {
        'windows_sdk_path%': '<(windows_sdk_default_path)',
      }, {
        'windows_sdk_path%': 'C:/Program Files (x86)/Windows Kits/8.0',
      }],
      ['OS=="win" and "<!(python <(DEPTH)/build/dir_exists.py <(directx_sdk_default_path))"=="True"', {
        'directx_sdk_path%': '<(directx_sdk_default_path)',
      }, {
        'directx_sdk_path%': '$(DXSDK_DIR)',
      }],
      ['OS=="win"', {
        'windows_driver_kit_path%': '$(WDK_DIR)',
        # Set the python arch to prevent conflicts with pyauto on Win64 build.
        # TODO(jschuh): crbug.com/177664 Investigate Win64 pyauto build.
        'python_arch%': 'ia32',
      }],
      ['os_posix==1 and OS!="mac" and OS!="ios"', {
        # Figure out the python architecture to decide if we build pyauto.
        'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/<(system_libdir)/libpython<(python_ver).so.1.0)',
        'conditions': [
          ['target_arch=="mipsel"', {
            'werror%': '',
            'disable_nacl%': 1,
            'nacl_untrusted_build%': 0,
            'linux_use_tcmalloc%': 0,
            'linux_breakpad%': 0,
            'sysroot%': '<(sysroot)',
            'CXX%': '<(CXX)',
          }],
          # All Chrome builds have breakpad symbols, but only process the
          # symbols from official builds.
          ['(branding=="Chrome" and buildtype=="Official")', {
            'linux_dump_symbols%': 1,
          }],
        ],
      }],  # os_posix==1 and OS!="mac" and OS!="ios"
      ['OS=="ios"', {
        'disable_nacl%': 1,
        'enable_background%': 0,
        'enable_gpu%': 0,
        'enable_task_manager%': 0,
        'icu_use_data_file_flag%': 1,
        'use_system_libxml%': 1,
        'use_system_sqlite%': 1,
        'locales==': [
          'ar', 'ca', 'cs', 'da', 'de', 'el', 'en-GB', 'en-US', 'es', 'fi',
          'fr', 'he', 'hr', 'hu', 'id', 'it', 'ja', 'ko', 'ms', 'nl', 'pl',
          'pt', 'pt-PT', 'ro', 'ru', 'sk', 'sv', 'th', 'tr', 'uk', 'vi',
          'zh-CN', 'zh-TW',
        ],

        # The Mac SDK is set for iOS builds and passed through to Mac
        # sub-builds. This allows the Mac sub-build SDK in an iOS build to be
        # overridden from the command line the same way it is for a Mac build.
        'mac_sdk%': '<!(python <(DEPTH)/build/mac/find_sdk.py 10.6)',

        # iOS SDK and deployment target support.  The iOS 5.0 SDK is actually
        # what is required, but the value is left blank so when it is set in
        # the project files it will be the "current" iOS SDK.  Forcing 5.0
        # even though it is "current" causes Xcode to spit out a warning for
        # every single project file for not using the "current" SDK.
        'ios_sdk%': '',
        'ios_sdk_path%': '',
        'ios_deployment_target%': '5.0',

        'conditions': [
          # ios_product_name is set to the name of the .app bundle as it should
          # appear on disk.
          ['branding=="Chrome"', {
            'ios_product_name%': 'Chrome',
          }, { # else: branding!="Chrome"
            'ios_product_name%': 'Chromium',
          }],
          ['branding=="Chrome" and buildtype=="Official"', {
            'ios_breakpad%': 1,
          }, { # else: branding!="Chrome" or buildtype!="Official"
            'ios_breakpad%': 0,
          }],
        ],
      }],  # OS=="ios"
      ['OS=="android"', {
        # Location of Android NDK.
        'variables': {
          'variables': {
             # Unfortuantely we have to use absolute paths to the SDK/NDK beause
             # they're passed to ant which uses a different relative path from
             # gyp.
             'android_ndk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/ndk/',
             'android_sdk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/sdk/',
             'android_host_arch%': '<!(uname -m)',
             # Android API-level of the SDK used for compilation.
             'android_sdk_version%': '17',
          },
          # Copy conditionally-set variables out one scope.
          'android_ndk_root%': '<(android_ndk_root)',
          'android_sdk_root%': '<(android_sdk_root)',
          'android_sdk_version%': '<(android_sdk_version)',
          'android_stlport_root': '<(android_ndk_root)/sources/cxx-stl/stlport',

          'android_sdk%': '<(android_sdk_root)/platforms/android-<(android_sdk_version)',

          # Android API level 14 is ICS (Android 4.0) which is the minimum
          # platform requirement for Chrome on Android, we use it for native
          # code compilation.
          'conditions': [
            ['target_arch == "ia32"', {
              'android_app_abi%': 'x86',
              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86/gdbserver/gdbserver',
              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-x86',
              'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
            }],
            ['target_arch=="arm"', {
              'conditions': [
                ['arm_version<7', {
                  'android_app_abi%': 'armeabi',
                }, {
                  'android_app_abi%': 'armeabi-v7a',
                }],
              ],
              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm/gdbserver/gdbserver',
              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-arm',
              'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
            }],
            ['target_arch == "mipsel"', {
              'android_app_abi%': 'mips',
              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-mips/gdbserver/gdbserver',
              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-mips',
              'android_toolchain%': '<(android_ndk_root)/toolchains/mipsel-linux-android-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
            }],
          ],
        },
        # Copy conditionally-set variables out one scope.
        'android_app_abi%': '<(android_app_abi)',
        'android_gdbserver%': '<(android_gdbserver)',
        'android_ndk_root%': '<(android_ndk_root)',
        'android_ndk_sysroot': '<(android_ndk_sysroot)',
        'android_sdk_root%': '<(android_sdk_root)',
        'android_sdk_version%': '<(android_sdk_version)',
        'android_toolchain%': '<(android_toolchain)',

        'android_ndk_include': '<(android_ndk_sysroot)/usr/include',
        'android_ndk_lib': '<(android_ndk_sysroot)/usr/lib',
        'android_sdk_tools%': '<(android_sdk_root)/platform-tools',
        'android_sdk%': '<(android_sdk)',
        'android_sdk_jar%': '<(android_sdk)/android.jar',

        'android_stlport_root': '<(android_stlport_root)',
        'android_stlport_include': '<(android_stlport_root)/stlport',
        'android_stlport_libs_dir': '<(android_stlport_root)/libs/<(android_app_abi)',

        # Location of the "strip" binary, used by both gyp and scripts.
        'android_strip%' : '<!(/bin/echo -n <(android_toolchain)/*-strip)',

        # Location of the "readelf" binary.
        'android_readelf%' : '<!(/bin/echo -n <(android_toolchain)/*-readelf)',

        # Provides an absolute path to PRODUCT_DIR (e.g. out/Release). Used
        # to specify the output directory for Ant in the Android build.
        'ant_build_out': '`cd <(PRODUCT_DIR) && pwd -P`',

        # Determines whether we should optimize JNI generation at the cost of
        # breaking assumptions in the build system that when inputs have changed
        # the outputs should always change as well.  This is meant purely for
        # developer builds, to avoid spurious re-linking of native files.
        'optimize_jni_generation%': 0,

        # Always uses openssl.
        'use_openssl%': 1,

        'proprietary_codecs%': '<(proprietary_codecs)',
        'enable_task_manager%': 0,
        'safe_browsing%': 2,
        'configuration_policy%': 0,
        'input_speech%': 0,
        'enable_automation%': 0,
        'java_bridge%': 1,
        'build_ffmpegsumo%': 0,
        'linux_use_tcmalloc%': 0,

        # Disable Native Client.
        'disable_nacl%': 1,

        # Android does not support background apps.
        'enable_background%': 0,

        # Sessions are store separately in the Java side.
        'enable_session_service%': 0,

        # Set to 1 once we have a notification system for Android.
        # http://crbug.com/115320
        'notifications%': 0,

        'p2p_apis%' : 0,

        'gtest_target_type%': 'shared_library',

        # Uses system APIs for decoding audio and video.
        'use_libffmpeg%': '0',

        # Always use the chromium skia.
        'use_system_skia%': '0',

        # When building as part of the Android system, use system libraries
        # where possible to reduce ROM size.
        # TODO(steveblock): Investigate using the system version of sqlite.
        'use_system_sqlite%': 0,  # '<(android_webview_build)',
        'use_system_expat%': '<(android_webview_build)',
        'use_system_icu%': '<(android_webview_build)',
        'use_system_stlport%': '<(android_webview_build)',

        'enable_managed_users%': 0,

        # Copy it out one scope.
        'android_webview_build%': '<(android_webview_build)',
      }],  # OS=="android"
      ['android_webview_build==1', {
        # When building the WebView in the Android tree, jarjar will remap all
        # the class names, so the JNI generator needs to know this.
        'jni_generator_jarjar_file': '../android_webview/build/jarjar-rules.txt',
      }],
      ['OS=="mac"', {
        # Enable clang on mac by default!
        'clang%': 1,
      }],  # OS=="mac"
      ['OS=="mac" or OS=="ios"', {
        'variables': {
          # Mac OS X SDK and deployment target support.  The SDK identifies
          # the version of the system headers that will be used, and
          # corresponds to the MAC_OS_X_VERSION_MAX_ALLOWED compile-time
          # macro.  "Maximum allowed" refers to the operating system version
          # whose APIs are available in the headers.  The deployment target
          # identifies the minimum system version that the built products are
          # expected to function on.  It corresponds to the
          # MAC_OS_X_VERSION_MIN_REQUIRED compile-time macro.  To ensure these
          # macros are available, #include <AvailabilityMacros.h>.  Additional
          # documentation on these macros is available at
          # http://developer.apple.com/mac/library/technotes/tn2002/tn2064.html#SECTION3
          # Chrome normally builds with the Mac OS X 10.6 SDK and sets the
          # deployment target to 10.6.  Other projects, such as O3D, may
          # override these defaults.

          # Normally, mac_sdk_min is used to find an SDK that Xcode knows
          # about that is at least the specified version. In official builds,
          # the SDK must match mac_sdk_min exactly. If the SDK is installed
          # someplace that Xcode doesn't know about, set mac_sdk_path to the
          # path to the SDK; when set to a non-empty string, SDK detection
          # based on mac_sdk_min will be bypassed entirely.
          'mac_sdk_min%': '10.6',
          'mac_sdk_path%': '',

          'mac_deployment_target%': '10.6',
        },

        'mac_sdk_min': '<(mac_sdk_min)',
        'mac_sdk_path': '<(mac_sdk_path)',
        'mac_deployment_target': '<(mac_deployment_target)',

        # Compile in Breakpad support by default so that it can be
        # tested, even if it is not enabled by default at runtime.
        'mac_breakpad_compiled_in%': 1,
        'conditions': [
          # mac_product_name is set to the name of the .app bundle as it should
          # appear on disk.  This duplicates data from
          # chrome/app/theme/chromium/BRANDING and
          # chrome/app/theme/google_chrome/BRANDING, but is necessary to get
          # these names into the build system.
          ['branding=="Chrome"', {
            'mac_product_name%': 'Google Chrome',
          }, { # else: branding!="Chrome"
            'mac_product_name%': 'Chromium',
          }],

          ['branding=="Chrome" and buildtype=="Official"', {
            'mac_sdk%': '<!(python <(DEPTH)/build/mac/find_sdk.py --verify <(mac_sdk_min) --sdk_path=<(mac_sdk_path))',
            # Enable uploading crash dumps.
            'mac_breakpad_uploads%': 1,
            # Enable dumping symbols at build time for use by Mac Breakpad.
            'mac_breakpad%': 1,
            # Enable Keystone auto-update support.
            'mac_keystone%': 1,
          }, { # else: branding!="Chrome" or buildtype!="Official"
            'mac_sdk%': '<!(python <(DEPTH)/build/mac/find_sdk.py <(mac_sdk_min))',
            'mac_breakpad_uploads%': 0,
            'mac_breakpad%': 0,
            'mac_keystone%': 0,
          }],
        ],
      }],  # OS=="mac" or OS=="ios"
      ['OS=="win"', {
        'conditions': [
          ['component=="shared_library"', {
            'win_use_allocator_shim%': 0,
          }],
          ['component=="shared_library" and "<(GENERATOR)"=="ninja"', {
            # Only enabled by default for ninja because it's buggy in VS.
            # Not enabled for component=static_library because some targets
            # are too large and the toolchain fails due to the size of the
            # .obj files.
            'incremental_chrome_dll%': 1,
          }],
          # Don't do incremental linking for large modules on 32-bit.
          ['MSVS_OS_BITS==32', {
            'msvs_large_module_debug_link_mode%': '1',  # No
          },{
            'msvs_large_module_debug_link_mode%': '2',  # Yes
          }],
          ['MSVS_VERSION=="2012e" or MSVS_VERSION=="2010e"', {
            'msvs_express%': 1,
            'secure_atl%': 0,
          },{
            'msvs_express%': 0,
            'secure_atl%': 1,
          }],
        ],
        'nacl_win64_defines': [
          # This flag is used to minimize dependencies when building
          # Native Client loader for 64-bit Windows.
          'NACL_WIN64',
        ],
      }],

      ['os_posix==1 and chromeos==0 and OS!="android" and OS!="ios"', {
        'use_cups%': 1,
      }, {
        'use_cups%': 0,
      }],

      ['enable_plugins==1 and (OS=="linux" or OS=="mac" or OS=="win" or google_tv==1)', {
        'enable_pepper_cdms%': 1,
      }, {
        'enable_pepper_cdms%': 0,
      }],

      # Native Client glibc toolchain is enabled
      # by default except on arm and mips.
      ['target_arch=="arm" or target_arch=="mipsel"', {
        'disable_glibc%': 1,
      }, {
        'disable_glibc%': 0,
      }],

      # Disable SSE2 when building for ARM or MIPS.
      ['target_arch=="arm" or target_arch=="mipsel"', {
        'disable_sse2%': 1,
      }, {
        'disable_sse2%': '<(disable_sse2)',
      }],

      # Set the relative path from this file to the GYP file of the JPEG
      # library used by Chromium.
      ['use_system_libjpeg==1 or use_libjpeg_turbo==0', {
        # Configuration for using the system libjeg is here.
        'libjpeg_gyp_path': '../third_party/libjpeg/libjpeg.gyp',
      }, {
        'libjpeg_gyp_path': '../third_party/libjpeg_turbo/libjpeg.gyp',
      }],

      # Options controlling the use of GConf (the classic GNOME configuration
      # system) and GIO, which contains GSettings (the new GNOME config system).
      ['chromeos==1', {
        'use_gconf%': 0,
        'use_gio%': 0,
      }, {
        'use_gconf%': 1,
        'use_gio%': 1,
      }],

      # Set up -D and -E flags passed into grit.
      ['branding=="Chrome"', {
        # TODO(mmoss) The .grd files look for _google_chrome, but for
        # consistency they should look for google_chrome_build like C++.
        'grit_defines': ['-D', '_google_chrome',
                         '-E', 'CHROMIUM_BUILD=google_chrome'],
      }, {
        'grit_defines': ['-D', '_chromium',
                         '-E', 'CHROMIUM_BUILD=chromium'],
      }],
      ['chromeos==1', {
        'grit_defines': ['-D', 'chromeos', '-D', 'scale_factors=2x'],
      }],
      ['toolkit_views==1', {
        'grit_defines': ['-D', 'toolkit_views'],
      }],
      ['use_aura==1', {
        'grit_defines': ['-D', 'use_aura'],
      }],
      ['use_ash==1', {
        'grit_defines': ['-D', 'use_ash'],
      }],
      ['use_nss==1', {
        'grit_defines': ['-D', 'use_nss'],
      }],
      ['use_ozone==1', {
        'grit_defines': ['-D', 'use_ozone'],
      }],
      ['file_manager_extension==1', {
        'grit_defines': ['-D', 'file_manager_extension'],
      }],
      ['image_loader_extension==1', {
        'grit_defines': ['-D', 'image_loader_extension'],
      }],
      ['remoting==1', {
        'grit_defines': ['-D', 'remoting'],
      }],
      ['use_titlecase_in_grd_files==1', {
        'grit_defines': ['-D', 'use_titlecase'],
      }],
      ['use_third_party_translations==1', {
        'grit_defines': ['-D', 'use_third_party_translations'],
        'locales': [
          'ast', 'bs', 'ca@valencia', 'en-AU', 'eo', 'eu', 'gl', 'hy', 'ia',
          'ka', 'ku', 'kw', 'ms', 'ug'
        ],
      }],
      ['OS=="android"', {
        'grit_defines': ['-t', 'android',
                         '-E', 'ANDROID_JAVA_TAGGED_ONLY=true'],
        'conditions': [
          ['google_tv==1', {
            'grit_defines': ['-D', 'google_tv'],
          }],
        ],
      }],
      ['OS=="mac"', {
        'grit_defines': ['-D', 'scale_factors=2x'],
      }],
      ['OS == "ios"', {
        'grit_defines': [
          # define for iOS specific resources.
          '-D', 'ios',
          # iOS uses a whitelist to filter resources.
          '-w', '<(DEPTH)/build/ios/grit_whitelist.txt'
        ],

        # Enable clang and host builds when generating with ninja-ios.
        'conditions': [
          ['"<(GENERATOR)"=="ninja"', {
            'clang%': 1,
            'host_os%': "mac",
          }]
        ],
      }],
      ['enable_extensions==1', {
        'grit_defines': ['-D', 'enable_extensions'],
      }],
      ['enable_printing==1', {
        'grit_defines': ['-D', 'enable_printing'],
      }],
      ['enable_themes==1', {
        'grit_defines': ['-D', 'enable_themes'],
      }],
      ['use_spring_wallpaper==1', {
        'grit_defines': ['-D', 'use_spring_wallpaper'],
      }],
      ['use_oem_wallpaper==1', {
        'grit_defines': ['-D', 'use_oem_wallpaper'],
      }],
      ['enable_app_list==1', {
        'grit_defines': ['-D', 'enable_app_list'],
      }],
      ['enable_settings_app==1', {
        'grit_defines': ['-D', 'enable_settings_app'],
      }],
      ['enable_google_now==1', {
        'grit_defines': ['-D', 'enable_google_now'],
      }],
      ['use_concatenated_impulse_responses==1', {
        'grit_defines': ['-D', 'use_concatenated_impulse_responses'],
      }],
      ['clang_use_chrome_plugins==1 and OS!="win"', {
        'clang_chrome_plugins_flags': [
          '<!@(<(DEPTH)/tools/clang/scripts/plugin_flags.sh)'
        ],
      }],

      ['asan==1 and OS!="win"', {
        'clang%': 1,
      }],
      ['asan==1 and OS=="mac"', {
        # TODO(glider): we do not strip ASan binaries until the dynamic ASan
        # runtime is fully adopted. See http://crbug.com/242503.
        'mac_strip_release': 0,
      }],
      ['tsan==1', {
        'clang%': 1,
      }],
      ['msan==1', {
        'clang%': 1,
      }],

      ['OS=="linux" and clang_type_profiler==1', {
        'clang%': 1,
        'clang_use_chrome_plugins%': 0,
        'conditions': [
          ['host_arch=="x64"', {
            'make_clang_dir%': 'third_party/llvm-allocated-type/Linux_x64',
          }],
          ['host_arch=="ia32"', {
            # 32-bit Clang is unsupported.  It may not build.  Put your 32-bit
            # Clang in this directory at your own risk if needed for some
            # purpose (e.g. to compare 32-bit and 64-bit behavior like memory
            # usage).  Any failure by this compiler should not close the tree.
            'make_clang_dir%': 'third_party/llvm-allocated-type/Linux_ia32',
          }],
        ],
      }],

      # On valgrind bots, override the optimizer settings so we don't inline too
      # much and make the stacks harder to figure out.
      #
      # TODO(rnk): Kill off variables that no one else uses and just implement
      # them under a build_for_tool== condition.
      ['build_for_tool=="memcheck" or build_for_tool=="tsan"', {
        # gcc flags
        'mac_debug_optimization': '1',
        'mac_release_optimization': '1',
        'release_optimize': '1',
        'no_gc_sections': 1,
        'debug_extra_cflags': '-g -fno-inline -fno-omit-frame-pointer '
                              '-fno-builtin -fno-optimize-sibling-calls',
        'release_extra_cflags': '-g -fno-inline -fno-omit-frame-pointer '
                                '-fno-builtin -fno-optimize-sibling-calls',

        # MSVS flags for TSan on Pin and Windows.
        'win_debug_RuntimeChecks': '0',
        'win_debug_disable_iterator_debugging': '1',
        'win_debug_Optimization': '1',
        'win_debug_InlineFunctionExpansion': '0',
        'win_release_InlineFunctionExpansion': '0',
        'win_release_OmitFramePointers': '0',

        'linux_use_tcmalloc': 1,
        'release_valgrind_build': 1,
        'werror': '',
        'component': 'static_library',
        'use_system_zlib': 0,
      }],

      # Build tweaks for DrMemory.
      # TODO(rnk): Combine with tsan config to share the builder.
      # http://crbug.com/108155
      ['build_for_tool=="drmemory"', {
        # These runtime checks force initialization of stack vars which blocks
        # DrMemory's uninit detection.
        'win_debug_RuntimeChecks': '0',
        # Iterator debugging is slow.
        'win_debug_disable_iterator_debugging': '1',
        # Try to disable optimizations that mess up stacks in a release build.
        # DrM-i#1054 (http://code.google.com/p/drmemory/issues/detail?id=1054)
        # /O2 and /Ob0 (disable inline) cannot be used together because of a
        # compiler bug, so we use /Ob1 instead.
        'win_release_InlineFunctionExpansion': '1',
        'win_release_OmitFramePointers': '0',
        # Ditto for debug, to support bumping win_debug_Optimization.
        'win_debug_InlineFunctionExpansion': 0,
        'win_debug_OmitFramePointers': 0,
        # Keep the code under #ifndef NVALGRIND.
        'release_valgrind_build': 1,
      }],

      # Enable RLZ on Win, Mac and ChromeOS.
      ['branding=="Chrome" and (OS=="win" or OS=="mac" or chromeos==1)', {
        'enable_rlz%': 1,
      }],

      # Set default compiler flags depending on ARM version.
      ['arm_version==5 and android_webview_build==0', {
        # Flags suitable for Android emulator
        'arm_arch%': 'armv5te',
        'arm_tune%': 'xscale',
        'arm_fpu%': '',
        'arm_float_abi%': 'soft',
        'arm_thumb%': 0,
      }],
      ['arm_version==6 and android_webview_build==0', {
        'arm_arch%': 'armv6',
        'arm_tune%': '',
        'arm_fpu%': '',
        'arm_float_abi%': 'soft',
        'arm_thumb%': 0,
      }],
      ['arm_version==7 and android_webview_build==0', {
        'arm_arch%': 'armv7-a',
        'arm_tune%': 'cortex-a8',
        'conditions': [
          ['arm_neon==1', {
            'arm_fpu%': 'neon',
          }, {
            'arm_fpu%': 'vfpv3-d16',
          }],
        ],
        'arm_float_abi%': 'softfp',
        'arm_thumb%': 1,
      }],

      ['android_webview_build==1', {
        # The WebView build gets its cpu-specific flags from the Android build system.
        'arm_arch%': '',
        'arm_tune%': '',
        'arm_fpu%': '',
        'arm_float_abi%': '',
        'arm_thumb%': 0,
      }],
    ],

    # List of default apps to install in new profiles.  The first list contains
    # the source files as found in svn.  The second list, used only for linux,
    # contains the destination location for each of the files.  When a crx
    # is added or removed from the list, the chrome/browser/resources/
    # default_apps/external_extensions.json file must also be updated.
    'default_apps_list': [
      'browser/resources/default_apps/external_extensions.json',
      'browser/resources/default_apps/gmail.crx',
      'browser/resources/default_apps/search.crx',
      'browser/resources/default_apps/youtube.crx',
      'browser/resources/default_apps/drive.crx',
      'browser/resources/default_apps/docs.crx',
    ],
    'default_apps_list_linux_dest': [
      '<(PRODUCT_DIR)/default_apps/external_extensions.json',
      '<(PRODUCT_DIR)/default_apps/gmail.crx',
      '<(PRODUCT_DIR)/default_apps/search.crx',
      '<(PRODUCT_DIR)/default_apps/youtube.crx',
      '<(PRODUCT_DIR)/default_apps/drive.crx',
      '<(PRODUCT_DIR)/default_apps/docs.crx',
    ],
  },
  'target_defaults': {
    'variables': {
      # The condition that operates on chromium_code is in a target_conditions
      # section, and will not have access to the default fallback value of
      # chromium_code at the top of this file, or to the chromium_code
      # variable placed at the root variables scope of .gyp files, because
      # those variables are not set at target scope.  As a workaround,
      # if chromium_code is not set at target scope, define it in target scope
      # to contain whatever value it has during early variable expansion.
      # That's enough to make it available during target conditional
      # processing.
      'chromium_code%': '<(chromium_code)',

      # See http://msdn.microsoft.com/en-us/library/aa652360(VS.71).aspx
      'win_release_Optimization%': '2', # 2 = /Os
      'win_debug_Optimization%': '0',   # 0 = /Od

      # See http://msdn.microsoft.com/en-us/library/2kxx5t2c(v=vs.80).aspx
      # Tri-state: blank is default, 1 on, 0 off
      'win_release_OmitFramePointers%': '0',
      # Tri-state: blank is default, 1 on, 0 off
      'win_debug_OmitFramePointers%': '',

      # See http://msdn.microsoft.com/en-us/library/8wtf2dfz(VS.71).aspx
      'win_debug_RuntimeChecks%': '3',    # 3 = all checks enabled, 0 = off

      # See http://msdn.microsoft.com/en-us/library/47238hez(VS.71).aspx
      'win_debug_InlineFunctionExpansion%': '',    # empty = default, 0 = off,
      'win_release_InlineFunctionExpansion%': '2', # 1 = only __inline, 2 = max

      # VS inserts quite a lot of extra checks to algorithms like
      # std::partial_sort in Debug build which make them O(N^2)
      # instead of O(N*logN). This is particularly slow under memory
      # tools like ThreadSanitizer so we want it to be disablable.
      # See http://msdn.microsoft.com/en-us/library/aa985982(v=VS.80).aspx
      'win_debug_disable_iterator_debugging%': '0',

      'release_extra_cflags%': '',
      'debug_extra_cflags%': '',

      'release_valgrind_build%': '<(release_valgrind_build)',

      # the non-qualified versions are widely assumed to be *nix-only
      'win_release_extra_cflags%': '',
      'win_debug_extra_cflags%': '',

      # TODO(thakis): Make this a blacklist instead, http://crbug.com/101600
      'enable_wexit_time_destructors%': '<(enable_wexit_time_destructors)',

      # Only used by Windows build for now.  Can be used to build into a
      # differet output directory, e.g., a build_dir_prefix of VS2010_ would
      # output files in src/build/VS2010_{Debug,Release}.
      'build_dir_prefix%': '',

      # Targets are by default not nacl untrusted code.
      'nacl_untrusted_build%': 0,

      'pnacl_compile_flags': [
        # pnacl uses the clang compiler so we need to supress all the
        # same warnings as we do for clang.
        # TODO(sbc): Remove these if/when they are removed from the clang
        # build.
        '-Wno-unused-function',
        '-Wno-char-subscripts',
        '-Wno-c++11-extensions',
        '-Wno-unnamed-type-template-args',
      ],

      'conditions': [
        ['OS=="win" and component=="shared_library"', {
          # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
          'win_release_RuntimeLibrary%': '2', # 2 = /MD (nondebug DLL)
          'win_debug_RuntimeLibrary%': '3',   # 3 = /MDd (debug DLL)
        }, {
          # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
          'win_release_RuntimeLibrary%': '0', # 0 = /MT (nondebug static)
          'win_debug_RuntimeLibrary%': '1',   # 1 = /MTd (debug static)
        }],
        ['OS=="ios"', {
          # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
          'mac_release_optimization%': 's', # Use -Os unless overridden
          'mac_debug_optimization%': '0',   # Use -O0 unless overridden
        }, {
          # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
          'mac_release_optimization%': '3', # Use -O3 unless overridden
          'mac_debug_optimization%': '0',   # Use -O0 unless overridden
        }],
      ],
    },
    'conditions': [
      ['(OS=="mac" or OS=="ios") and asan==1', {
        'dependencies': [
          '<(DEPTH)/build/mac/asan.gyp:asan_dynamic_runtime',
        ],
      }],
      ['OS=="linux" and linux_use_tcmalloc==1 and clang_type_profiler==1', {
        'cflags_cc!': ['-fno-rtti'],
        'cflags_cc+': [
          '-frtti',
          '-gline-tables-only',
          '-fintercept-allocation-functions',
        ],
        'defines': ['TYPE_PROFILING'],
        'dependencies': [
          '<(DEPTH)/base/allocator/allocator.gyp:type_profiler',
        ],
      }],
      ['chrome_split_dll', {
        'variables': {
          'chrome_split_dll': '<!(python <(DEPTH)/tools/win/split_link/check_installed.py)',
        },
        'defines': ['CHROME_SPLIT_DLL'],
      }],
      ['OS=="linux" and clang==1 and host_arch=="ia32"', {
        # TODO(dmikurube): Remove -Wno-sentinel when Clang/LLVM is fixed.
        # See http://crbug.com/162818.
        'cflags+': ['-Wno-sentinel'],
      }],
      ['OS=="win" and "<(msbuild_toolset)"!=""', {
        'msbuild_toolset': '<(msbuild_toolset)',
      }],
      ['branding=="Chrome"', {
        'defines': ['GOOGLE_CHROME_BUILD'],
      }, {  # else: branding!="Chrome"
        'defines': ['CHROMIUM_BUILD'],
      }],
      ['OS=="mac" and component=="shared_library"', {
        'xcode_settings': {
          'DYLIB_INSTALL_NAME_BASE': '@rpath',
          'LD_RUNPATH_SEARCH_PATHS': [
            # For unbundled binaries.
            '@loader_path/.',
            # For bundled binaries, to get back from Binary.app/Contents/MacOS.
            '@loader_path/../../..',
          ],
        },
      }],
      ['enable_rlz==1', {
        'defines': ['ENABLE_RLZ'],
      }],
      ['component=="shared_library"', {
        'defines': ['COMPONENT_BUILD'],
      }],
      ['toolkit_views==1', {
        'defines': ['TOOLKIT_VIEWS=1'],
      }],
      ['ui_compositor_image_transport==1', {
        'defines': ['UI_COMPOSITOR_IMAGE_TRANSPORT'],
      }],
      ['use_aura==1', {
        'defines': ['USE_AURA=1'],
      }],
      ['use_ash==1', {
        'defines': ['USE_ASH=1'],
      }],
      ['use_ozone==1', {
        'defines': ['USE_OZONE=1'],
      }],
      ['use_default_render_theme==1', {
        'defines': ['USE_DEFAULT_RENDER_THEME=1'],
      }],
      ['use_libjpeg_turbo==1', {
        'defines': ['USE_LIBJPEG_TURBO=1'],
      }],
      ['use_nss==1', {
        'defines': ['USE_NSS=1'],
      }],
      ['use_x11==1', {
        'defines': ['USE_X11=1'],
      }],
      ['enable_one_click_signin==1', {
        'defines': ['ENABLE_ONE_CLICK_SIGNIN'],
      }],
      ['toolkit_uses_gtk==1 and toolkit_views==0', {
        # TODO(erg): We are progressively sealing up use of deprecated features
        # in gtk in preparation for an eventual porting to gtk3.
        'defines': ['GTK_DISABLE_SINGLE_INCLUDES=1'],
      }],
      ['chromeos==1', {
        'defines': ['OS_CHROMEOS=1'],
      }],
      ['google_tv==1', {
        'defines': ['GOOGLE_TV=1'],
      }],
      ['use_xi2_mt!=0', {
        'defines': ['USE_XI2_MT=<(use_xi2_mt)'],
      }],
      ['file_manager_extension==1', {
        'defines': ['FILE_MANAGER_EXTENSION=1'],
      }],
      ['image_loader_extension==1', {
        'defines': ['IMAGE_LOADER_EXTENSION=1'],
      }],
      ['profiling==1', {
        'defines': ['ENABLE_PROFILING=1'],
      }],
      ['OS=="linux" and glibcxx_debug==1', {
        'defines': ['_GLIBCXX_DEBUG=1',],
        'cflags_cc+': ['-g'],
      }],
      ['remoting==1', {
        'defines': ['ENABLE_REMOTING=1'],
      }],
      ['enable_webrtc==1', {
        'defines': ['ENABLE_WEBRTC=1'],
      }],
      ['proprietary_codecs==1', {
        'defines': ['USE_PROPRIETARY_CODECS'],
      }],
      ['enable_viewport==1', {
        'defines': ['ENABLE_VIEWPORT'],
      }],
      ['enable_pepper_cdms==1', {
        'defines': ['ENABLE_PEPPER_CDMS'],
      }],
      ['configuration_policy==1', {
        'defines': ['ENABLE_CONFIGURATION_POLICY'],
      }],
      ['input_speech==1', {
        'defines': ['ENABLE_INPUT_SPEECH'],
      }],
      ['notifications==1', {
        'defines': ['ENABLE_NOTIFICATIONS'],
      }],
      ['enable_hidpi==1', {
        'defines': ['ENABLE_HIDPI=1'],
      }],
      ['fastbuild!=0', {
        'xcode_settings': {
          'GCC_GENERATE_DEBUGGING_SYMBOLS': 'NO',
        },
        'conditions': [
          ['clang==1', {
            # Clang creates chubby debug information, which makes linking very
            # slow. For now, don't create debug information with clang.  See
            # http://crbug.com/70000
            'conditions': [
              ['OS=="linux"', {
                'variables': {
                  'debug_extra_cflags': '-g0',
                },
              }],
              # Android builds symbols on release by default, disable them.
              ['OS=="android"', {
                'variables': {
                  'debug_extra_cflags': '-g0',
                  'release_extra_cflags': '-g0',
                },
              }],
            ],
          }, { # else clang!=1
            'conditions': [
              ['OS=="win" and fastbuild==2', {
                # Completely disable debug information.
                'msvs_settings': {
                  'VCLinkerTool': {
                    'GenerateDebugInformation': 'false',
                  },
                  'VCCLCompilerTool': {
                    'DebugInformationFormat': '0',
                  },
                },
              }],
              ['OS=="win" and fastbuild==1', {
                'msvs_settings': {
                  'VCLinkerTool': {
                    # This tells the linker to generate .pdbs, so that
                    # we can get meaningful stack traces.
                    'GenerateDebugInformation': 'true',
                  },
                  'VCCLCompilerTool': {
                    # No debug info to be generated by compiler.
                    'DebugInformationFormat': '0',
                  },
                },
              }],
              ['OS=="linux" and fastbuild==2', {
                'variables': {
                  'debug_extra_cflags': '-g0',
                },
              }],
              ['OS=="linux" and fastbuild==1', {
                'variables': {
                  'debug_extra_cflags': '-g1',
                },
              }],
              ['OS=="android" and fastbuild==2', {
                'variables': {
                  'debug_extra_cflags': '-g0',
                  'release_extra_cflags': '-g0',
                },
              }],
              ['OS=="android" and fastbuild==1', {
                'variables': {
                  'debug_extra_cflags': '-g1',
                  'release_extra_cflags': '-g1',
                },
              }],
            ],
          }], # clang!=1
        ],
      }],  # fastbuild!=0
      ['dcheck_always_on!=0', {
        'defines': ['DCHECK_ALWAYS_ON=1'],
      }],  # dcheck_always_on!=0
      ['win_use_allocator_shim==0', {
        'conditions': [
          ['OS=="win"', {
            'defines': ['NO_TCMALLOC'],
          }],
        ],
      }],
      ['enable_gpu==1', {
        'defines': [
          'ENABLE_GPU=1',
        ],
      }],
      ['use_openssl==1', {
        'defines': [
          'USE_OPENSSL=1',
        ],
      }],
      ['enable_eglimage==1', {
        'defines': [
          'ENABLE_EGLIMAGE=1',
        ],
      }],
      ['asan==1 and OS=="win"', {
        # Since asan on windows uses Syzygy, we need /PROFILE turned on to
        # produce appropriate pdbs.
        'msvs_settings': {
          'VCLinkerTool': {
            'Profile': 'true',
          },
        },
        'defines': ['ADDRESS_SANITIZER'],
      }],  # asan==1 and OS=="win"
      ['coverage!=0', {
        'conditions': [
          ['OS=="mac" or OS=="ios"', {
            'xcode_settings': {
              'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS': 'YES',  # -fprofile-arcs
              'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',  # -ftest-coverage
            },
          }],
          ['OS=="mac"', {
            # Add -lgcov for types executable, shared_library, and
            # loadable_module; not for static_library.
            # This is a delayed conditional.
            'target_conditions': [
              ['_type!="static_library"', {
                'xcode_settings': { 'OTHER_LDFLAGS': [ '-lgcov' ] },
              }],
            ],
          }],
          ['OS=="linux" or OS=="android"', {
            'cflags': [ '-ftest-coverage',
                        '-fprofile-arcs' ],
            'link_settings': { 'libraries': [ '-lgcov' ] },
          }],
          ['OS=="win"', {
            'variables': {
              # Disable incremental linking for all modules.
              # 0: inherit, 1: disabled, 2: enabled.
              'msvs_debug_link_incremental': '1',
              'msvs_large_module_debug_link_mode': '1',
              # Disable RTC. Syzygy explicitly doesn't support RTC instrumented
              # binaries for now.
              'win_debug_RuntimeChecks': '0',
            },
            'defines': [
              # Disable iterator debugging (huge speed boost without any
              # change in coverage results).
              '_HAS_ITERATOR_DEBUGGING=0',
            ],
            'msvs_settings': {
              'VCLinkerTool': {
                # Enable profile information (necessary for coverage
                # instrumentation). This is incompatible with incremental
                # linking.
                'Profile': 'true',
              },
            }
         }],  # OS==win
        ],  # conditions for coverage
      }],  # coverage!=0
      ['OS=="win"', {
        'defines': [
          '__STD_C',
          '_CRT_SECURE_NO_DEPRECATE',
          '_SCL_SECURE_NO_DEPRECATE',
          # This define is required to pull in the new Win8 interfaces from
          # system headers like ShObjIdl.h.
          'NTDDI_VERSION=0x06020000',
        ],
        'include_dirs': [
          '<(DEPTH)/third_party/wtl/include',
        ],
        'conditions': [
          ['win_z7!=0', {
            'msvs_settings': {
              # Generates debug info when win_z7=1
              # even if fastbuild=1 (that makes GenerateDebugInformation false).
              'VCLinkerTool': {
                'GenerateDebugInformation': 'true',
              },
              'VCCLCompilerTool': {
                'DebugInformationFormat': '1',
              }
            }
          }],
          ['"<(GENERATOR)"=="msvs"', {
            'msvs_settings': {
              'VCLinkerTool': {
                # Make the pdb name sane. Otherwise foo.exe and foo.dll both
                # have foo.pdb. The ninja generator already defaults to this and
                # can't handle the $(TargetPath) macro.
                'ProgramDatabaseFile': '$(TargetPath).pdb',
              }
            },
          }],
        ],  # win_z7!=0
      }],  # OS==win
      ['enable_task_manager==1', {
        'defines': [
          'ENABLE_TASK_MANAGER=1',
        ],
      }],
      ['enable_extensions==1', {
        'defines': [
          'ENABLE_EXTENSIONS=1',
        ],
      }],
      ['OS=="win" and branding=="Chrome"', {
        'defines': ['ENABLE_SWIFTSHADER'],
      }],
      ['enable_dart==1', {
        'defines': ['WEBKIT_USING_DART=1'],
      }],
      ['enable_plugin_installation==1', {
        'defines': ['ENABLE_PLUGIN_INSTALLATION=1'],
      }],
      ['enable_plugins==1', {
        'defines': ['ENABLE_PLUGINS=1'],
      }],
      ['enable_session_service==1', {
        'defines': ['ENABLE_SESSION_SERVICE=1'],
      }],
      ['enable_themes==1', {
        'defines': ['ENABLE_THEMES=1'],
      }],
      ['enable_autofill_dialog==1', {
        'defines': ['ENABLE_AUTOFILL_DIALOG=1'],
      }],
      ['enable_background==1', {
        'defines': ['ENABLE_BACKGROUND=1'],
      }],
      ['enable_automation==1', {
        'defines': ['ENABLE_AUTOMATION=1'],
      }],
      ['enable_google_now==1', {
        'defines': ['ENABLE_GOOGLE_NOW=1'],
      }],
      ['enable_language_detection==1', {
        'defines': ['ENABLE_LANGUAGE_DETECTION=1'],
      }],
      ['enable_printing==1', {
        'defines': ['ENABLE_PRINTING=1'],
      }],
      ['enable_captive_portal_detection==1', {
        'defines': ['ENABLE_CAPTIVE_PORTAL_DETECTION=1'],
      }],
      ['enable_app_list==1', {
        'defines': ['ENABLE_APP_LIST=1'],
      }],
      ['enable_settings_app==1', {
        'defines': ['ENABLE_SETTINGS_APP=1'],
      }],
      ['disable_ftp_support==1', {
        'defines': ['DISABLE_FTP_SUPPORT=1'],
      }],
      ['enable_managed_users==1', {
        'defines': ['ENABLE_MANAGED_USERS=1'],
      }],
      ['spdy_proxy_auth_origin != ""', {
        'defines': ['SPDY_PROXY_AUTH_ORIGIN="<(spdy_proxy_auth_origin)"'],
      }],
      ['spdy_proxy_auth_property != ""', {
        'defines': ['SPDY_PROXY_AUTH_PROPERTY="<(spdy_proxy_auth_property)"'],
      }],
      ['spdy_proxy_auth_value != ""', {
        'defines': ['SPDY_PROXY_AUTH_VALUE="<(spdy_proxy_auth_value)"'],
      }],
      ['enable_mdns==1', {
        'defines': ['ENABLE_MDNS=1'],
      }]
    ],  # conditions for 'target_defaults'
    'target_conditions': [
      ['enable_wexit_time_destructors==1', {
        'conditions': [
          [ 'clang==1', {
            'cflags': [
              '-Wexit-time-destructors',
            ],
            'xcode_settings': {
              'WARNING_CFLAGS': [
                '-Wexit-time-destructors',
              ],
            },
          }],
        ],
      }],
      ['chromium_code==0', {
        'conditions': [
          [ 'os_posix==1 and OS!="mac" and OS!="ios"', {
            # We don't want to get warnings from third-party code,
            # so remove any existing warning-enabling flags like -Wall.
            'cflags!': [
              '-Wall',
              '-Wextra',
            ],
            'cflags_cc': [
              # Don't warn about hash_map in third-party code.
              '-Wno-deprecated',
            ],
            'cflags': [
              # Don't warn about printf format problems.
              # This is off by default in gcc but on in Ubuntu's gcc(!).
              '-Wno-format',
            ],
            'cflags_cc!': [
              # TODO(fischman): remove this.
              # http://code.google.com/p/chromium/issues/detail?id=90453
              '-Wsign-compare',
            ]
          }],
          # TODO: Fix all warnings on chromeos too.
          [ 'os_posix==1 and OS!="mac" and OS!="ios" and (clang!=1 or chromeos==1)', {
            'cflags!': [
              '-Werror',
            ],
          }],
          [ 'os_posix==1 and os_bsd!=1 and OS!="mac" and OS!="android"', {
            'cflags': [
              # Don't warn about ignoring the return value from e.g. close().
              # This is off by default in some gccs but on by default in others.
              # BSD systems do not support this option, since they are usually
              # using gcc 4.2.1, which does not have this flag yet.
              '-Wno-unused-result',
            ],
          }],
          [ 'OS=="win"', {
            'defines': [
              '_CRT_SECURE_NO_DEPRECATE',
              '_CRT_NONSTDC_NO_WARNINGS',
              '_CRT_NONSTDC_NO_DEPRECATE',
              '_SCL_SECURE_NO_DEPRECATE',
            ],
            'msvs_disabled_warnings': [4800],
            'msvs_settings': {
              'VCCLCompilerTool': {
                'WarningLevel': '3',
                'WarnAsError': '<(win_third_party_warn_as_error)',
                'Detect64BitPortabilityProblems': 'false',
              },
            },
            'conditions': [
              ['buildtype=="Official"', {
                'msvs_settings': {
                  'VCCLCompilerTool': { 'WarnAsError': 'false' },
                }
              }],
            ],
          }],
          # TODO(darin): Unfortunately, some third_party code depends on base.
          [ 'OS=="win" and component=="shared_library"', {
            'msvs_disabled_warnings': [
              4251,  # class 'std::xx' needs to have dll-interface.
            ],
          }],
          [ 'OS=="mac" or OS=="ios"', {
            'xcode_settings': {
              'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
            },
            'conditions': [
              ['buildtype=="Official"', {
                'xcode_settings': {
                  'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',    # -Werror
                },
              }],
            ],
          }],
          [ 'OS=="ios"', {
            'xcode_settings': {
              # TODO(ios): Fix remaining warnings in third-party code, then
              # remove this; the Mac cleanup didn't get everything that's
              # flagged in an iOS build.
              'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
              'RUN_CLANG_STATIC_ANALYZER': 'NO',
            },
          }],
        ],
      }, {
        'includes': [
           # Rules for excluding e.g. foo_win.cc from the build on non-Windows.
          'filename_rules.gypi',
        ],
        # In Chromium code, we define __STDC_foo_MACROS in order to get the
        # C99 macros on Mac and Linux.
        'defines': [
          '__STDC_CONSTANT_MACROS',
          '__STDC_FORMAT_MACROS',
        ],
        'conditions': [
          ['OS=="win"', {
            # turn on warnings for signed/unsigned mismatch on chromium code.
            'msvs_settings': {
              'VCCLCompilerTool': {
                'AdditionalOptions': ['/we4389'],
              },
            },
          }],
          ['OS=="win" and component=="shared_library"', {
            'msvs_disabled_warnings': [
              4251,  # class 'std::xx' needs to have dll-interface.
            ],
          }],
        ],
      }],
    ],  # target_conditions for 'target_defaults'
    'default_configuration': 'Debug',
    'configurations': {
      # VCLinkerTool LinkIncremental values below:
      #   0 == default
      #   1 == /INCREMENTAL:NO
      #   2 == /INCREMENTAL
      # Debug links incremental, Release does not.
      #
      # Abstract base configurations to cover common attributes.
      #
      'Common_Base': {
        'abstract': 1,
        'msvs_configuration_attributes': {
          'OutputDirectory': '<(DEPTH)\\build\\<(build_dir_prefix)$(ConfigurationName)',
          'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
          'CharacterSet': '1',
        },
        # Add the default import libs.
        'msvs_settings':{
          'VCLinkerTool': {
            'AdditionalDependencies': [
              'kernel32.lib',
              'gdi32.lib',
              'winspool.lib',
              'comdlg32.lib',
              'advapi32.lib',
              'shell32.lib',
              'ole32.lib',
              'oleaut32.lib',
              'user32.lib',
              'uuid.lib',
              'odbc32.lib',
              'odbccp32.lib',
              'delayimp.lib',
            ],
          },
        },
      },
      'x86_Base': {
        'abstract': 1,
        'msvs_settings': {
          'VCLinkerTool': {
            'TargetMachine': '1',
          },
        },
        'msvs_configuration_platform': 'Win32',
      },
      'x64_Base': {
        'abstract': 1,
        'msvs_configuration_platform': 'x64',
        'msvs_settings': {
          'VCLinkerTool': {
            'TargetMachine': '17', # x86 - 64
            'AdditionalLibraryDirectories!':
              ['<(windows_sdk_path)/Lib/win8/um/x86'],
            'AdditionalLibraryDirectories':
              ['<(windows_sdk_path)/Lib/win8/um/x64'],
            # Doesn't exist x64 SDK. Should use oleaut32 in any case.
            'IgnoreDefaultLibraryNames': [ 'olepro32.lib' ],
          },
          'VCLibrarianTool': {
            'AdditionalLibraryDirectories!':
              ['<(windows_sdk_path)/Lib/win8/um/x86'],
            'AdditionalLibraryDirectories':
              ['<(windows_sdk_path)/Lib/win8/um/x64'],
          },
        },
      },
      'Debug_Base': {
        'abstract': 1,
        'defines': [
          'DYNAMIC_ANNOTATIONS_ENABLED=1',
          'WTF_USE_DYNAMIC_ANNOTATIONS=1',
        ],
        'xcode_settings': {
          'COPY_PHASE_STRIP': 'NO',
          'GCC_OPTIMIZATION_LEVEL': '<(mac_debug_optimization)',
          'OTHER_CFLAGS': [
            '<@(debug_extra_cflags)',
          ],
        },
        'msvs_settings': {
          'VCCLCompilerTool': {
            'Optimization': '<(win_debug_Optimization)',
            'PreprocessorDefinitions': ['_DEBUG'],
            'BasicRuntimeChecks': '<(win_debug_RuntimeChecks)',
            'RuntimeLibrary': '<(win_debug_RuntimeLibrary)',
            'conditions': [
              # According to MSVS, InlineFunctionExpansion=0 means
              # "default inlining", not "/Ob0".
              # Thus, we have to handle InlineFunctionExpansion==0 separately.
              ['win_debug_InlineFunctionExpansion==0', {
                'AdditionalOptions': ['/Ob0'],
              }],
              ['win_debug_InlineFunctionExpansion!=""', {
                'InlineFunctionExpansion':
                  '<(win_debug_InlineFunctionExpansion)',
              }],
              ['win_debug_disable_iterator_debugging==1', {
                'PreprocessorDefinitions': ['_HAS_ITERATOR_DEBUGGING=0'],
              }],

              # if win_debug_OmitFramePointers is blank, leave as default
              ['win_debug_OmitFramePointers==1', {
                'OmitFramePointers': 'true',
              }],
              ['win_debug_OmitFramePointers==0', {
                'OmitFramePointers': 'false',
                # The above is not sufficient (http://crbug.com/106711): it
                # simply eliminates an explicit "/Oy", but both /O2 and /Ox
                # perform FPO regardless, so we must explicitly disable.
                # We still want the false setting above to avoid having
                # "/Oy /Oy-" and warnings about overriding.
                'AdditionalOptions': ['/Oy-'],
              }],
            ],
            'AdditionalOptions': [ '<@(win_debug_extra_cflags)', ],
          },
          'VCLinkerTool': {
            'LinkIncremental': '<(msvs_debug_link_incremental)',
            # ASLR makes debugging with windbg difficult because Chrome.exe and
            # Chrome.dll share the same base name. As result, windbg will
            # name the Chrome.dll module like chrome_<base address>, where
            # <base address> typically changes with each launch. This in turn
            # means that breakpoints in Chrome.dll don't stick from one launch
            # to the next. For this reason, we turn ASLR off in debug builds.
            # Note that this is a three-way bool, where 0 means to pick up
            # the default setting, 1 is off and 2 is on.
            'RandomizedBaseAddress': 1,
          },
          'VCResourceCompilerTool': {
            'PreprocessorDefinitions': ['_DEBUG'],
          },
        },
        'conditions': [
          ['OS=="linux" or OS=="android"', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '<@(debug_extra_cflags)',
                ],
              }],
            ],
          }],
          # Disabled on iOS because it was causing a crash on startup.
          # TODO(michelea): investigate, create a reduced test and possibly
          # submit a radar.
          ['release_valgrind_build==0 and OS!="ios"', {
            'xcode_settings': {
              'OTHER_CFLAGS': [
                '-fstack-protector-all',  # Implies -fstack-protector
              ],
            },
          }],
        ],
      },
      'Release_Base': {
        'abstract': 1,
        'defines': [
          'NDEBUG',
        ],
        'xcode_settings': {
          'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
          'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)',
          'OTHER_CFLAGS': [ '<@(release_extra_cflags)', ],
        },
        'msvs_settings': {
          'VCCLCompilerTool': {
            'RuntimeLibrary': '<(win_release_RuntimeLibrary)',
            'conditions': [
              # In official builds, each target will self-select
              # an optimization level.
              ['buildtype!="Official"', {
                  'Optimization': '<(win_release_Optimization)',
                },
              ],
              # According to MSVS, InlineFunctionExpansion=0 means
              # "default inlining", not "/Ob0".
              # Thus, we have to handle InlineFunctionExpansion==0 separately.
              ['win_release_InlineFunctionExpansion==0', {
                'AdditionalOptions': ['/Ob0'],
              }],
              ['win_release_InlineFunctionExpansion!=""', {
                'InlineFunctionExpansion':
                  '<(win_release_InlineFunctionExpansion)',
              }],

              # if win_release_OmitFramePointers is blank, leave as default
              ['win_release_OmitFramePointers==1', {
                'OmitFramePointers': 'true',
              }],
              ['win_release_OmitFramePointers==0', {
                'OmitFramePointers': 'false',
                # The above is not sufficient (http://crbug.com/106711): it
                # simply eliminates an explicit "/Oy", but both /O2 and /Ox
                # perform FPO regardless, so we must explicitly disable.
                # We still want the false setting above to avoid having
                # "/Oy /Oy-" and warnings about overriding.
                'AdditionalOptions': ['/Oy-'],
              }],
            ],
            'AdditionalOptions': [ '<@(win_release_extra_cflags)', ],
          },
          'VCLinkerTool': {
            # LinkIncremental is a tri-state boolean, where 0 means default
            # (i.e., inherit from parent solution), 1 means false, and
            # 2 means true.
            'LinkIncremental': '1',
            # This corresponds to the /PROFILE flag which ensures the PDB
            # file contains FIXUP information (growing the PDB file by about
            # 5%) but does not otherwise alter the output binary. This
            # information is used by the Syzygy optimization tool when
            # decomposing the release image.
            'Profile': 'true',
          },
        },
        'conditions': [
          ['msvs_use_common_release', {
            'includes': ['release.gypi'],
          }],
          ['release_valgrind_build==0 and tsan==0', {
            'defines': [
              'NVALGRIND',
              'DYNAMIC_ANNOTATIONS_ENABLED=0',
            ],
          }, {
            'defines': [
              'DYNAMIC_ANNOTATIONS_ENABLED=1',
              'WTF_USE_DYNAMIC_ANNOTATIONS=1',
            ],
          }],
          ['win_use_allocator_shim==0', {
            'defines': ['NO_TCMALLOC'],
          }],
          ['os_posix==1 and chromium_code==1', {
            # Non-chromium code is not guaranteed to compile cleanly
            # with _FORTIFY_SOURCE. Also, fortified build may fail
            # when optimizations are disabled, so only do that for Release
            # build.
            'defines': [
              '_FORTIFY_SOURCE=2',
            ],
          }],
          ['OS=="linux" or OS=="android"', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '<@(release_extra_cflags)',
                ],
              }],
            ],
          }],
          ['OS=="ios"', {
            'defines': [
              'NS_BLOCK_ASSERTIONS=1',
            ],
          }],
        ],
      },
      #
      # Concrete configurations
      #
      'Debug': {
        'inherit_from': ['Common_Base', 'x86_Base', 'Debug_Base'],
      },
      'Release': {
        'inherit_from': ['Common_Base', 'x86_Base', 'Release_Base'],
      },
      'conditions': [
        [ 'OS=="win"', {
          # TODO(bradnelson): add a gyp mechanism to make this more graceful.
          'Debug_x64': {
            'inherit_from': ['Common_Base', 'x64_Base', 'Debug_Base'],
          },
          'Release_x64': {
            'inherit_from': ['Common_Base', 'x64_Base', 'Release_Base'],
          },
        }],
      ],
    },
  },
  'conditions': [
    ['os_posix==1', {
      'target_defaults': {
        'ldflags': [
          '-Wl,-z,now',
          '-Wl,-z,relro',
        ],
      },
    }],
    ['os_posix==1 and chromeos==0', {
      # Chrome OS enables -fstack-protector-strong via its build wrapper,
      # and we want to avoid overriding this, so stack-protector is only
      # enabled when not building on Chrome OS.
      # TODO(phajdan.jr): Use -fstack-protector-strong when our gcc
      # supports it.
      'target_defaults': {
        'cflags': [
          '-fstack-protector',
          '--param=ssp-buffer-size=4',
        ],
      },
    }],
    ['os_posix==1 and OS!="mac" and OS!="ios"', {
      'target_defaults': {
        # Enable -Werror by default, but put it in a variable so it can
        # be disabled in ~/.gyp/include.gypi on the valgrind builders.
        'variables': {
          'werror%': '-Werror',
          'libraries_for_target%': '',
        },
        'defines': [
          '_FILE_OFFSET_BITS=64',
        ],
        'cflags': [
          '<(werror)',  # See note above about the werror variable.
          '-pthread',
          '-fno-exceptions',
          '-fno-strict-aliasing',  # See http://crbug.com/32204
          '-Wall',
          # TODO(evan): turn this back on once all the builds work.
          # '-Wextra',
          # Don't warn about unused function params.  We use those everywhere.
          '-Wno-unused-parameter',
          # Don't warn about the "struct foo f = {0};" initialization pattern.
          '-Wno-missing-field-initializers',
          # Don't export any symbols (for example, to plugins we dlopen()).
          # Note: this is *required* to make some plugins work.
          '-fvisibility=hidden',
          '-pipe',
        ],
        'cflags_cc': [
          '-fno-rtti',
          '-fno-threadsafe-statics',
          # Make inline functions have hidden visiblity by default.
          # Surprisingly, not covered by -fvisibility=hidden.
          '-fvisibility-inlines-hidden',
          # GCC turns on -Wsign-compare for C++ under -Wall, but clang doesn't,
          # so we specify it explicitly.
          # TODO(fischman): remove this if http://llvm.org/PR10448 obsoletes it.
          # http://code.google.com/p/chromium/issues/detail?id=90453
          '-Wsign-compare',
        ],
        'ldflags': [
          '-pthread', '-Wl,-z,noexecstack',
        ],
        'libraries' : [
          '<(libraries_for_target)',
        ],
        'configurations': {
          'Debug_Base': {
            'variables': {
              'debug_optimize%': '0',
            },
            'defines': [
              '_DEBUG',
            ],
            'cflags': [
              '-O>(debug_optimize)',
              '-g',
            ],
            'conditions' : [
              ['OS=="android"', {
                # Only link with needed input sections. This is to avoid getting
                # undefined reference to __cxa_bad_typeid in the CDU library.
                'ldflags': [
                  '-Wl,--gc-sections',
                ],
              }],
              ['OS=="android" and android_full_debug==0', {
                # Some configurations are copied from Release_Base to reduce
                # the binary size.
                'variables': {
                  'debug_optimize%': 's',
                },
                'cflags': [
                  '-fomit-frame-pointer',
                  '-fdata-sections',
                  '-ffunction-sections',
                ],
                'ldflags': [
                  '-Wl,-O1',
                  '-Wl,--as-needed',
                ],
              }],
              ['OS=="linux" and target_arch=="ia32"', {
                'ldflags': [
                  '-Wl,--no-as-needed',
                ],
              }],
            ],
          },
          'Release_Base': {
            'variables': {
              'release_optimize%': '2',
              # Binaries become big and gold is unable to perform GC
              # and remove unused sections for some of test targets
              # on 32 bit platform.
              # (This is currently observed only in chromeos valgrind bots)
              # The following flag is to disable --gc-sections linker
              # option for these bots.
              'no_gc_sections%': 0,

              # TODO(bradnelson): reexamine how this is done if we change the
              # expansion of configurations
              'release_valgrind_build%': 0,
            },
            'cflags': [
              '-O<(release_optimize)',
              # Don't emit the GCC version ident directives, they just end up
              # in the .comment section taking up binary size.
              '-fno-ident',
              # Put data and code in their own sections, so that unused symbols
              # can be removed at link time with --gc-sections.
              '-fdata-sections',
              '-ffunction-sections',
            ],
            'ldflags': [
              # Specifically tell the linker to perform optimizations.
              # See http://lwn.net/Articles/192624/ .
              '-Wl,-O1',
              '-Wl,--as-needed',
            ],
            'conditions' : [
              ['no_gc_sections==0', {
                'ldflags': [
                  '-Wl,--gc-sections',
                ],
              }],
              ['OS=="android"', {
                'variables': {
                  'release_optimize%': 's',
                },
                'cflags': [
                  '-fomit-frame-pointer',
                ],
              }],
              ['clang==1', {
                'cflags!': [
                  '-fno-ident',
                ],
              }],
              ['profiling==1', {
                'cflags': [
                  '-fno-omit-frame-pointer',
                  '-g',
                ],
              }],
              # Can be omitted to reduce output size. Does not seem to affect
              # crash reporting.
              ['target_arch=="ia32"', {
                'cflags': [
                  '-fno-unwind-tables',
                  '-fno-asynchronous-unwind-tables',
                ],
              }],
            ],
          },
        },
        'variants': {
          'coverage': {
            'cflags': ['-fprofile-arcs', '-ftest-coverage'],
            'ldflags': ['-fprofile-arcs'],
          },
          'profile': {
            'cflags': ['-pg', '-g'],
            'ldflags': ['-pg'],
          },
          'symbols': {
            'cflags': ['-g'],
          },
        },
        'conditions': [
          ['target_arch=="ia32"', {
            'target_conditions': [
              ['_toolset=="target"', {
                'asflags': [
                  # Needed so that libs with .s files (e.g. libicudata.a)
                  # are compatible with the general 32-bit-ness.
                  '-32',
                ],
                # All floating-point computations on x87 happens in 80-bit
                # precision.  Because the C and C++ language standards allow
                # the compiler to keep the floating-point values in higher
                # precision than what's specified in the source and doing so
                # is more efficient than constantly rounding up to 64-bit or
                # 32-bit precision as specified in the source, the compiler,
                # especially in the optimized mode, tries very hard to keep
                # values in x87 floating-point stack (in 80-bit precision)
                # as long as possible. This has important side effects, that
                # the real value used in computation may change depending on
                # how the compiler did the optimization - that is, the value
                # kept in 80-bit is different than the value rounded down to
                # 64-bit or 32-bit. There are possible compiler options to
                # make this behavior consistent (e.g. -ffloat-store would keep
                # all floating-values in the memory, thus force them to be
                # rounded to its original precision) but they have significant
                # runtime performance penalty.
                #
                # -mfpmath=sse -msse2 makes the compiler use SSE instructions
                # which keep floating-point values in SSE registers in its
                # native precision (32-bit for single precision, and 64-bit
                # for double precision values). This means the floating-point
                # value used during computation does not change depending on
                # how the compiler optimized the code, since the value is
                # always kept in its specified precision.
                'conditions': [
                  ['branding=="Chromium" and disable_sse2==0', {
                    'cflags': [
                      '-march=pentium4',
                      '-msse2',
                      '-mfpmath=sse',
                    ],
                  }],
                  # ChromeOS targets Pinetrail, which is sse3, but most of the
                  # benefit comes from sse2 so this setting allows ChromeOS
                  # to build on other CPUs.  In the future -march=atom would
                  # help but requires a newer compiler.
                  ['chromeos==1 and disable_sse2==0', {
                    'cflags': [
                      '-msse2',
                    ],
                  }],
                  # Use gold linker for Android ia32 target.
                  ['OS=="android"', {
                    'cflags': [
                      '-fuse-ld=gold',
                    ],
                    'ldflags': [
                      '-fuse-ld=gold',
                    ],
                  }],
                  # Install packages have started cropping up with
                  # different headers between the 32-bit and 64-bit
                  # versions, so we have to shadow those differences off
                  # and make sure a 32-bit-on-64-bit build picks up the
                  # right files.
                  # For android build, use NDK headers instead of host headers
                  ['host_arch!="ia32" and OS!="android"', {
                    'include_dirs+': [
                      '/usr/include32',
                    ],
                  }],
                ],
                # -mmmx allows mmintrin.h to be used for mmx intrinsics.
                # video playback is mmx and sse2 optimized.
                'cflags': [
                  '-m32',
                  '-mmmx',
                ],
                'ldflags': [
                  '-m32',
                ],
              }],
            ],
          }],
          ['target_arch=="arm"', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags_cc': [
                  # The codesourcery arm-2009q3 toolchain warns at that the ABI
                  # has changed whenever it encounters a varargs function. This
                  # silences those warnings, as they are not helpful and
                  # clutter legitimate warnings.
                  '-Wno-abi',
                ],
                'conditions': [
                  ['arm_arch!=""', {
                    'cflags': [
                      '-march=<(arm_arch)',
                    ],
                  }],
                  ['arm_tune!=""', {
                    'cflags': [
                      '-mtune=<(arm_tune)',
                    ],
                  }],
                  ['arm_fpu!=""', {
                    'cflags': [
                      '-mfpu=<(arm_fpu)',
                    ],
                  }],
                  ['arm_float_abi!=""', {
                    'cflags': [
                      '-mfloat-abi=<(arm_float_abi)',
                    ],
                  }],
                  ['arm_thumb==1', {
                    'cflags': [
                    '-mthumb',
                    ]
                  }],
                  ['OS=="android"', {
                    # Most of the following flags are derived from what Android
                    # uses by default when building for arm, reference for which
                    # can be found in the following file in the Android NDK:
                    # toolchains/arm-linux-androideabi-4.4.3/setup.mk
                    'cflags': [
                      # The tree-sra optimization (scalar replacement for
                      # aggregates enabling subsequent optimizations) leads to
                      # invalid code generation when using the Android NDK's
                      # compiler (r5-r7). This can be verified using
                      # webkit_unit_tests' WTF.Checked_int8_t test.
                      '-fno-tree-sra',
                      '-fuse-ld=gold',
                      '-Wno-psabi',
                    ],
                    # Android now supports .relro sections properly.
                    # NOTE: While these flags enable the generation of .relro
                    # sections, the generated libraries can still be loaded on
                    # older Android platform versions.
                    'ldflags': [
                        '-Wl,-z,relro',
                        '-Wl,-z,now',
                        '-fuse-ld=gold',
                    ],
                    'conditions': [
                      ['arm_thumb==1', {
                        'cflags': [ '-mthumb-interwork' ],
                      }],
                      ['profiling==1', {
                        'cflags': [
                          '-marm', # Probably reduntant, but recommend by "perf" docs.
                          '-mapcs-frame', # Seems required by -fno-omit-frame-pointer.
                        ],
                      }],
                      ['clang==1', {
                        'cflags!': [
                          # Clang does not support the following options.
                          '-mthumb-interwork',
                          '-finline-limit=64',
                          '-fno-tree-sra',
                          '-fuse-ld=gold',
                          '-Wno-psabi',
                        ],
                      }],
                    ],
                  }],
                ],
              }],
            ],
          }],
          ['target_arch=="mipsel"', {
            'target_conditions': [
              ['_toolset=="target"', {
                'conditions': [
                  ['mips_arch_variant=="mips32r2"', {
                    'cflags': ['-mips32r2', '-Wa,-mips32r2'],
                  }, {
                    'cflags': ['-mips32', '-Wa,-mips32'],
                  }],
                ],
                'cflags': [
                  '-EL',
                  '-mhard-float',
                ],
                'ldflags': [
                  '-EL',
                  '-Wl,--no-keep-memory'
                ],
                'cflags_cc': [
                  '-Wno-uninitialized',
                ],
              }],
            ],
          }],
          ['linux_fpic==1', {
            'cflags': [
              '-fPIC',
            ],
            'ldflags': [
              '-fPIC',
            ],
          }],
          ['sysroot!=""', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '--sysroot=<(sysroot)',
                ],
                'ldflags': [
                  '--sysroot=<(sysroot)',
                  '<!(<(DEPTH)/build/linux/sysroot_ld_path.sh <(sysroot))',
                ],
              }]]
          }],
          ['clang==1', {
            'cflags': [
              '-Wheader-hygiene',

              # Don't die on dtoa code that uses a char as an array index.
              '-Wno-char-subscripts',

              # Clang spots more unused functions.
              '-Wno-unused-function',

              # Warns on switches on enums that cover all enum values but
              # also contain a default: branch. Chrome is full of that.
              '-Wno-covered-switch-default',

              # Warns when a const char[] is converted to bool.
              '-Wstring-conversion',
            ],
            'cflags!': [
              # Clang doesn't seem to know know this flag.
              '-mfpmath=sse',
            ],
          }],
          ['clang==1 and OS!="android"', {
            # Turn on C++11.
            'cflags': [
              # This warns on using ints as initializers for floats in
              # initializer lists (e.g. |int a = f(); CGSize s = { a, a };|),
              # which happens in several places in chrome code. Not sure if
              # this is worth fixing.
              '-Wno-c++11-narrowing',

              # This warns about code like |"0x%08"NACL_PRIxPTR| -- with C++11
              # user-defined literals, this is now a string literal with a UD
              # suffix. However, this is used heavily in NaCl code, so disable
              # the warning for now.
              '-Wno-reserved-user-defined-literal',
            ],
            'cflags_cc': [
              # See the comment in the Mac section for what it takes to move
              # this to -std=c++11.
              '-std=gnu++11',
            ],
          }],
          ['clang==1 and OS=="android"', {
            # Android uses gcc4.4, and clang isn't compatible with gcc4.4's
            # libstdc++ in C++11 mode. So no C++11 mode for Android yet.
            # Doesn't work with asan for some reason either: crbug.com/233464
            'cflags': [
              # Especially needed for gtest macros using enum values from Mac
              # system headers.
              # TODO(pkasting): In C++11 this is legal, so this should be
              # removed when we change to that.  (This is also why we don't
              # bother fixing all these cases today.)
              '-Wno-unnamed-type-template-args',
              # This (rightfully) complains about 'override', which we use
              # heavily.
              '-Wno-c++11-extensions',
            ],
          }],
          ['clang==1 and clang_use_chrome_plugins==1', {
            'cflags': [
              '<@(clang_chrome_plugins_flags)',
            ],
          }],
          ['clang==1 and clang_load!=""', {
            'cflags': [
              '-Xclang', '-load', '-Xclang', '<(clang_load)',
            ],
          }],
          ['clang==1 and clang_add_plugin!=""', {
            'cflags': [
              '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
            ],
          }],
          ['clang==1 and target_arch=="ia32"', {
            'cflags': [
              # Else building libyuv gives clang's register allocator issues,
              # see llvm.org/PR15798 / crbug.com/233709
              '-momit-leaf-frame-pointer',
            ],
          }],
          ['clang==1 and "<(GENERATOR)"=="ninja"', {
            'cflags': [
              # See http://crbug.com/110262
              '-fcolor-diagnostics',
            ],
          }],
          # Common options for AddressSanitizer, ThreadSanitizer and
          # MemorySanitizer.
          ['asan==1 or tsan==1 or msan==1', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '-fno-omit-frame-pointer',
                  '-gline-tables-only',
                ],
                'ldflags!': [
                  # Functions interposed by the sanitizers can make ld think
                  # that some libraries aren't needed when they actually are,
                  # http://crbug.com/234010. As workaround, disable --as-needed.
                  '-Wl,--as-needed',
                ],
              }],
              ['_toolset=="target" and OS=="linux"', {
                'ldflags': [
                  # http://crbug.com/234010.
                  '-lrt',
                ],
              }],
            ],
          }],
          ['asan==1', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '-fsanitize=address',
                  '-w',  # http://crbug.com/162783
                ],
                'ldflags': [
                  '-fsanitize=address',
                ],
                'defines': [
                  'ADDRESS_SANITIZER',
                ],
              }],
            ],
            'conditions': [
              ['OS=="mac"', {
                'cflags': [
                  '-mllvm -asan-globals=0',  # http://crbug.com/196561
                ],
              }],
            ],
          }],
          ['tsan==1', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '-fsanitize=thread',
                  '-fPIC',
                  '-mllvm', '-tsan-blacklist=<(tsan_blacklist)',
                ],
                'ldflags': [
                  '-fsanitize=thread',
                ],
                'defines': [
                  'THREAD_SANITIZER',
                  'DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1',
                  'WTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1',
                ],
                'target_conditions': [
                  ['_type=="executable"', {
                    'ldflags': [
                      '-pie',
                    ],
                  }],
                ],
              }],
            ],
          }],
          ['msan==1', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '-fsanitize=memory',
                  '-fsanitize-memory-track-origins',
                  '-fPIC',
                ],
                'ldflags': [
                  '-fsanitize=memory',
                ],
                'defines': [
                  'MEMORY_SANITIZER',
                ],
                'target_conditions': [
                  ['_type=="executable"', {
                    'ldflags': [
                      '-pie',
                    ],
                  }],
                ],
              }],
            ],
          }],
          ['order_profiling!=0 and (chromeos==1 or OS=="linux" or OS=="android")', {
            'target_conditions' : [
              ['_toolset=="target"', {
                'cflags': [
                  '-finstrument-functions',
                  # Allow mmx intrinsics to inline, so that the
                  # compiler can expand the intrinsics.
                  '-finstrument-functions-exclude-file-list=mmintrin.h',
                ],
              }],
            ],
          }],
          ['linux_breakpad==1', {
            'defines': ['USE_LINUX_BREAKPAD'],
          }],
          ['linux_dump_symbols==1', {
            'cflags': [ '-g' ],
            'conditions': [
              ['target_arch=="ia32" and OS!="android"', {
                'target_conditions': [
                  ['_toolset=="target"', {
                    'ldflags': [
                      # Workaround for linker OOM.
                      '-Wl,--no-keep-memory',
                    ],
                  }],
                ],
              }],
            ],
          }],
          ['linux_use_heapchecker==1', {
            'variables': {'linux_use_tcmalloc%': 1},
            'defines': ['USE_HEAPCHECKER'],
            'conditions': [
              ['component=="shared_library"', {
                # See crbug.com/112389
                # TODO(glider): replace with --dynamic-list or something
                'ldflags': ['-rdynamic'],
              }],
            ],
          }],
          ['linux_use_tcmalloc==0 and android_use_tcmalloc==0', {
            'defines': ['NO_TCMALLOC'],
          }],
          ['linux_keep_shadow_stacks==1', {
            'defines': ['KEEP_SHADOW_STACKS'],
            'cflags': [
              '-finstrument-functions',
              # Allow mmx intrinsics to inline, so that the compiler can expand
              # the intrinsics.
              '-finstrument-functions-exclude-file-list=mmintrin.h',
            ],
          }],
          ['linux_use_gold_flags==1', {
            'ldflags': [
              # Experimentation found that using four linking threads
              # saved ~20% of link time.
              # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
              '-Wl,--threads',
              '-Wl,--thread-count=4',
            ],
            'conditions': [
              ['release_valgrind_build==0', {
                'target_conditions': [
                  ['_toolset=="target"', {
                    'ldflags': [
                      # There seems to be a conflict of --icf and -pie
                      # in gold which can generate crashy binaries. As
                      # a security measure, -pie takes precendence for
                      # now.
                      #'-Wl,--icf=safe',
                      '-Wl,--icf=none',
                    ],
                  }],
                ],
              }],
            ],
          }],
          ['linux_use_gold_binary==1', {
            'ldflags': [
              # Put our gold binary in the search path for the linker.
              # We pass the path to gold to the compiler.  gyp leaves
              # unspecified what the cwd is when running the compiler,
              # so the normal gyp path-munging fails us.  This hack
              # gets the right path.
              '-B<(PRODUCT_DIR)/../../third_party/gold',
            ],
          }],
        ],
      },
    }],
    # FreeBSD-specific options; note that most FreeBSD options are set above,
    # with Linux.
    ['OS=="freebsd"', {
      'target_defaults': {
        'ldflags': [
          '-Wl,--no-keep-memory',
        ],
      },
    }],
    # Android-specific options; note that most are set above with Linux.
    ['OS=="android"', {
      'variables': {
        # This is a unique identifier for a given build. It's used for
        # identifying various build artifacts corresponding to a particular
        # build of chrome (e.g. where to find archived symbols).
        'chrome_build_id%': '',
        'conditions': [
          # Use shared stlport library when system one used.
          # Figure this out early since it needs symbols from libgcc.a, so it
          # has to be before that in the set of libraries.
          ['use_system_stlport==1', {
            'android_stlport_library': 'stlport',
          }, {
            'conditions': [
              ['component=="shared_library"', {
                  'android_stlport_library': 'stlport_shared',
              }, {
                  'android_stlport_library': 'stlport_static',
              }],
            ],
          }],
        ],

        # Placing this variable here prevents from forking libvpx, used
        # by remoting.  Remoting is off, so it needn't built,
        # so forking it's deps seems like overkill.
        # But this variable need defined to properly run gyp.
        # A proper solution is to have an OS==android conditional
        # in third_party/libvpx/libvpx.gyp to define it.
        'libvpx_path': 'lib/linux/arm',
      },
      'target_defaults': {
        'variables': {
          'release_extra_cflags%': '',
          'conditions': [
            # If we're using the components build, append "cr" to all shared
            # libraries to avoid naming collisions with android system library
            # versions with the same name (e.g. skia, icu).
            ['component=="shared_library"', {
              'android_product_extension': 'cr.so',
            }, {
              'android_product_extension': 'so',
            } ],
          ],
        },
        'target_conditions': [
          ['_type=="shared_library"', {
           'product_extension': '<(android_product_extension)',
          }],

          # Settings for building device targets using Android's toolchain.
          # These are based on the setup.mk file from the Android NDK.
          #
          # The NDK Android executable link step looks as follows:
          #  $LDFLAGS
          #  $(TARGET_CRTBEGIN_DYNAMIC_O)  <-- crtbegin.o
          #  $(PRIVATE_OBJECTS)            <-- The .o that we built
          #  $(PRIVATE_STATIC_LIBRARIES)   <-- The .a that we built
          #  $(TARGET_LIBGCC)              <-- libgcc.a
          #  $(PRIVATE_SHARED_LIBRARIES)   <-- The .so that we built
          #  $(PRIVATE_LDLIBS)             <-- System .so
          #  $(TARGET_CRTEND_O)            <-- crtend.o
          #
          # For now the above are approximated for executables by adding
          # crtbegin.o to the end of the ldflags and 'crtend.o' to the end
          # of 'libraries'.
          #
          # The NDK Android shared library link step looks as follows:
          #  $LDFLAGS
          #  $(PRIVATE_OBJECTS)            <-- The .o that we built
          #  -l,--whole-archive
          #  $(PRIVATE_WHOLE_STATIC_LIBRARIES)
          #  -l,--no-whole-archive
          #  $(PRIVATE_STATIC_LIBRARIES)   <-- The .a that we built
          #  $(TARGET_LIBGCC)              <-- libgcc.a
          #  $(PRIVATE_SHARED_LIBRARIES)   <-- The .so that we built
          #  $(PRIVATE_LDLIBS)             <-- System .so
          #
          # For now, assume that whole static libraries are not needed.
          #
          # For both executables and shared libraries, add the proper
          # libgcc.a to the start of libraries which puts it in the
          # proper spot after .o and .a files get linked in.
          #
          # TODO: The proper thing to do longer-tem would be proper gyp
          # support for a custom link command line.
          ['_toolset=="target"', {
            'cflags!': [
              '-pthread',  # Not supported by Android toolchain.
            ],
            'cflags': [
              '-ffunction-sections',
              '-funwind-tables',
              '-g',
              '-fstack-protector',
              '-fno-short-enums',
              '-finline-limit=64',
              '-Wa,--noexecstack',
              '<@(release_extra_cflags)',
            ],
            'defines': [
              'ANDROID',
              '__GNU_SOURCE=1',  # Necessary for clone()
              'USE_STLPORT=1',
              '_STLP_USE_PTR_SPECIALIZATIONS=1',
              'CHROME_BUILD_ID="<(chrome_build_id)"',
            ],
            'ldflags!': [
              '-pthread',  # Not supported by Android toolchain.
            ],
            'ldflags': [
              '-nostdlib',
              '-Wl,--no-undefined',
              # Don't export symbols from statically linked libraries.
              '-Wl,--exclude-libs=ALL',
            ],
            'libraries': [
              '-l<(android_stlport_library)',
              # Manually link the libgcc.a that the cross compiler uses.
              '<!(<(android_toolchain)/*-gcc -print-libgcc-file-name)',
              '-lc',
              '-ldl',
              '-lstdc++',
              '-lm',
            ],
            'conditions': [
              ['component=="shared_library"', {
                'ldflags!': [
                  '-Wl,--exclude-libs=ALL',
                ],
              }],
              ['clang==1', {
                'cflags': [
                  # Work around incompatibilities between bionic and clang
                  # headers.
                  '-D__compiler_offsetof=__builtin_offsetof',
                  '-Dnan=__builtin_nan',
                ],
                'conditions': [
                  ['target_arch=="arm"', {
                    'cflags': [
                      '-target arm-linux-androideabi',
                      '-mllvm -arm-enable-ehabi',
                    ],
                    'ldflags': [
                      '-target arm-linux-androideabi',
                    ],
                  }],
                  ['target_arch=="ia32"', {
                    'cflags': [
                      '-target x86-linux-androideabi',
                    ],
                    'ldflags': [
                      '-target x86-linux-androideabi',
                    ],
                  }],
                ],
              }],
              ['asan==1', {
                'cflags': [
                  # Android build relies on -Wl,--gc-sections removing
                  # unreachable code. ASan instrumentation for globals inhibits
                  # this and results in a library with unresolvable relocations.
                  # TODO(eugenis): find a way to reenable this.
                  '-mllvm -asan-globals=0',
                ],
              }],
              ['android_webview_build==0', {
                'defines': [
                  # The NDK has these things, but doesn't define the constants
                  # to say that it does. Define them here instead.
                  'HAVE_SYS_UIO_H',
                ],
                'cflags': [
                  '--sysroot=<(android_ndk_sysroot)',
                ],
                'ldflags': [
                  '--sysroot=<(android_ndk_sysroot)',
                ],
              }],
              ['android_webview_build==1', {
                'include_dirs': [
                  # OpenAL headers from the Android tree.
                  '<(android_src)/frameworks/wilhelm/include',
                ],
                'cflags': [
                  # Android predefines this as 1; undefine it here so Chromium
                  # can redefine it later to be 2 for chromium code and unset
                  # for third party code. This works because cflags are added
                  # before defines.
                  '-U_FORTIFY_SOURCE',
                  # Disable any additional warnings enabled by the Android build system but which
                  # chromium does not build cleanly with (when treating warning as errors).
                  # Things that are part of -Wextra:
                  '-Wno-extra', # Enabled by -Wextra, but no specific flag
                  '-Wno-ignored-qualifiers',
                  '-Wno-type-limits',
                ],
                'cflags_cc': [
                  # Disabling c++0x-compat should be handled in WebKit, but
                  # this currently doesn't work because gcc_version is not set
                  # correctly when building with the Android build system.
                  # TODO(torne): Fix this in WebKit.
                  '-Wno-error=c++0x-compat',
                  # Other things unrelated to -Wextra:
                  '-Wno-non-virtual-dtor',
                  '-Wno-sign-promo',
                ],
              }],
              ['android_webview_build==1 and chromium_code==0', {
                'cflags': [
                  # There is a class of warning which:
                  #  1) Android always enables and also treats as errors
                  #  2) Chromium ignores in third party code
                  # So we re-enable those warnings when building Android.
                  '-Wno-address',
                  '-Wno-format-security',
                  '-Wno-return-type',
                  '-Wno-sequence-point',
                ],
                'cflags_cc': [
                  '-Wno-non-virtual-dtor',
                ]
              }],
              ['target_arch == "arm"', {
                'ldflags': [
                  # Enable identical code folding to reduce size.
                  '-Wl,--icf=safe',
                ],
              }],
              # NOTE: The stlport header include paths below are specified in
              # cflags rather than include_dirs because they need to come
              # after include_dirs. Think of them like system headers, but
              # don't use '-isystem' because the arm-linux-androideabi-4.4.3
              # toolchain (circa Gingerbread) will exhibit strange errors.
              # The include ordering here is important; change with caution.
              ['use_system_stlport==1', {
                'cflags': [
                  # For libstdc++/include, which is used by stlport.
                  '-I<(android_src)/bionic',
                  '-I<(android_src)/external/stlport/stlport',
                ],
              }, { # else: use_system_stlport!=1
                'cflags': [
                  '-I<(android_stlport_include)',
                ],
                'ldflags': [
                  '-L<(android_stlport_libs_dir)',
                ],
              }],
              ['target_arch=="ia32"', {
                # The x86 toolchain currently has problems with stack-protector.
                'cflags!': [
                  '-fstack-protector',
                ],
                'cflags': [
                  '-fno-stack-protector',
                ],
              }],
            ],
            'target_conditions': [
              ['_type=="executable"', {
                'ldflags': [
                  '-Bdynamic',
                  '-Wl,-dynamic-linker,/system/bin/linker',
                  '-Wl,--gc-sections',
                  '-Wl,-z,nocopyreloc',
                  # crtbegin_dynamic.o should be the last item in ldflags.
                  '<(android_ndk_lib)/crtbegin_dynamic.o',
                ],
                'libraries': [
                  # crtend_android.o needs to be the last item in libraries.
                  # Do not add any libraries after this!
                  '<(android_ndk_lib)/crtend_android.o',
                ],
                'conditions': [
                  ['asan==1', {
                    'cflags': [
                      '-fPIE',
                    ],
                    'ldflags': [
                      '-pie',
                    ],
                  }],
                ],
              }],
              ['_type=="shared_library" or _type=="loadable_module"', {
                'ldflags': [
                  '-Wl,-shared,-Bsymbolic',
                ],
                'conditions': [
                  ['android_webview_build==0', {
                    'ldflags': [
                      # crtbegin_so.o should be the last item in ldflags.
                      '<(android_ndk_lib)/crtbegin_so.o',
                    ],
                    'libraries': [
                      # crtend_so.o needs to be the last item in libraries.
                      # Do not add any libraries after this!
                      '<(android_ndk_lib)/crtend_so.o',
                    ],
                  }],
                ],
              }],
              # ndk-build copies .a's around the filesystem, breaking
              # relative paths in thin archives.  Disable using thin
              # archives to avoid problems until one of these is fixed:
              # http://code.google.com/p/android/issues/detail?id=40302
              # http://code.google.com/p/android/issues/detail?id=40303
              ['_type=="static_library"', {
                'standalone_static_library': 1,
              }],
            ],
          }],
          # Settings for building host targets using the system toolchain.
          ['_toolset=="host"', {
            'cflags!': [
              # Due to issues in Clang build system, using ASan on 32-bit
              # binaries on x86_64 host is problematic.
              # TODO(eugenis): re-enable.
              '-fsanitize=address',
              '-w',  # http://crbug.com/162783
            ],
            'ldflags!': [
              '-fsanitize=address',
              '-Wl,-z,noexecstack',
              '-Wl,--gc-sections',
              '-Wl,-O1',
              '-Wl,--as-needed',
            ],
            'sources/': [
              ['exclude', '_android(_unittest)?\\.cc$'],
              ['exclude', '(^|/)android/']
            ],
          }],
          # Settings for building host targets on mac.
          ['_toolset=="host" and host_os=="mac"', {
            'ldflags!': [
              '-Wl,-z,now',
              '-Wl,-z,relro',
            ],
          }],
        ],
      },
    }],
    ['OS=="solaris"', {
      'cflags!': ['-fvisibility=hidden'],
      'cflags_cc!': ['-fvisibility-inlines-hidden'],
    }],
    ['OS=="mac" or OS=="ios"', {
      'target_defaults': {
        'mac_bundle': 0,
        'xcode_settings': {
          'ALWAYS_SEARCH_USER_PATHS': 'NO',
          # Don't link in libarclite_macosx.a, see http://crbug.com/156530.
          'CLANG_LINK_OBJC_RUNTIME': 'NO',          # -fno-objc-link-runtime
          'GCC_C_LANGUAGE_STANDARD': 'c99',         # -std=c99
          'GCC_CW_ASM_SYNTAX': 'NO',                # No -fasm-blocks
          'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',        # -fno-exceptions
          'GCC_ENABLE_CPP_RTTI': 'NO',              # -fno-rtti
          'GCC_ENABLE_PASCAL_STRINGS': 'NO',        # No -mpascal-strings
          # GCC_INLINES_ARE_PRIVATE_EXTERN maps to -fvisibility-inlines-hidden
          'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES',
          'GCC_OBJC_CALL_CXX_CDTORS': 'YES',        # -fobjc-call-cxx-cdtors
          'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',      # -fvisibility=hidden
          'GCC_THREADSAFE_STATICS': 'NO',           # -fno-threadsafe-statics
          'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES',    # -Werror
          'GCC_VERSION': '4.2',
          'GCC_WARN_ABOUT_MISSING_NEWLINE': 'YES',  # -Wnewline-eof
          'USE_HEADERMAP': 'NO',
          'WARNING_CFLAGS': [
            '-Wall',
            '-Wendif-labels',
            '-Wextra',
            # Don't warn about unused function parameters.
            '-Wno-unused-parameter',
            # Don't warn about the "struct foo f = {0};" initialization
            # pattern.
            '-Wno-missing-field-initializers',
          ],
          'conditions': [
            ['chromium_mac_pch', {'GCC_PRECOMPILE_PREFIX_HEADER': 'YES'},
                                 {'GCC_PRECOMPILE_PREFIX_HEADER': 'NO'}
            ],
            # Note that the prebuilt Clang binaries should not be used for iOS
            # development except for ASan builds.
            ['clang==1', {
              'CC': '$(SOURCE_ROOT)/<(clang_dir)/clang',
              'LDPLUSPLUS': '$(SOURCE_ROOT)/<(clang_dir)/clang++',

              # Don't use -Wc++0x-extensions, which Xcode 4 enables by default
              # when building with clang. This warning is triggered when the
              # override keyword is used via the OVERRIDE macro from
              # base/compiler_specific.h.
              'CLANG_WARN_CXX0X_EXTENSIONS': 'NO',
              # Warn if automatic synthesis is triggered with
              # the -Wobjc-missing-property-synthesis flag.
              'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
              'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
              'WARNING_CFLAGS': [
                '-Wheader-hygiene',

                # This warns on using ints as initializers for floats in
                # initializer lists (e.g. |int a = f(); CGSize s = { a, a };|),
                # which happens in several places in chrome code. Not sure if
                # this is worth fixing.
                '-Wno-c++11-narrowing',

                # This warns about code like |"0x%08"NACL_PRIxPTR| -- with C++11
                # user-defined literals, this is now a string literal with a UD
                # suffix. However, this is used heavily in NaCl code, so disable
                # the warning for now.
                '-Wno-reserved-user-defined-literal',

                # Don't die on dtoa code that uses a char as an array index.
                # This is required solely for base/third_party/dmg_fp/dtoa.cc.
                '-Wno-char-subscripts',

                # Clang spots more unused functions.
                '-Wno-unused-function',

                # Warns on switches on enums that cover all enum values but
                # also contain a default: branch. Chrome is full of that.
                '-Wno-covered-switch-default',

                # Warns when a const char[] is converted to bool.
                '-Wstring-conversion',
              ],
              'OTHER_CPLUSPLUSFLAGS': [
                # gnu++11 instead of c++11 is needed because some code uses
                # typeof() (a GNU extension).
                # TODO(thakis): Eventually switch this to c++11 instead of
                # gnu++11 (once typeof can be removed, which is blocked on c++11
                # being available everywhere).
                # TODO(thakis): Use CLANG_CXX_LANGUAGE_STANDARD instead once all
                # bots use xcode 4 -- http://crbug.com/147515).
                '$(inherited)', '-std=gnu++11',
              ],
            }],
            ['clang==1 and clang_use_chrome_plugins==1', {
              'OTHER_CFLAGS': [
                '<@(clang_chrome_plugins_flags)',
              ],
            }],
            ['clang==1 and clang_load!=""', {
              'OTHER_CFLAGS': [
                '-Xclang', '-load', '-Xclang', '<(clang_load)',
              ],
            }],
            ['clang==1 and clang_add_plugin!=""', {
              'OTHER_CFLAGS': [
                '-Xclang', '-add-plugin', '-Xclang', '<(clang_add_plugin)',
              ],
            }],
            ['clang==1 and "<(GENERATOR)"=="ninja"', {
              'OTHER_CFLAGS': [
                # See http://crbug.com/110262
                '-fcolor-diagnostics',
              ],
            }],
          ],
        },
        'conditions': [
          ['clang==1', {
            'variables': {
              'clang_dir': '../third_party/llvm-build/Release+Asserts/bin',
            },
          }],
          ['asan==1', {
            'xcode_settings': {
              'OTHER_CFLAGS': [
                '-fsanitize=address',
                '-mllvm -asan-globals=0',  # http://crbug.com/196561
                '-w',  # http://crbug.com/162783
              ],
            },
            'defines': [
              'ADDRESS_SANITIZER',
            ],
          }],
        ],
        'target_conditions': [
          ['_type!="static_library"', {
            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
            'conditions': [
              ['asan==1', {
                'xcode_settings': {
                  'OTHER_LDFLAGS': [
                    '-fsanitize=address',
                  ],
                },
              }],
            ],
          }],
          ['_mac_bundle', {
            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
            'target_conditions': [
              ['_type=="executable"', {
                'conditions': [
                  ['asan==1', {
                    'postbuilds': [
                      {
                        'variables': {
                          # Define copy_asan_dylib_path in a variable ending in
                          # _path so that gyp understands it's a path and
                          # performs proper relativization during dict merging.
                          'copy_asan_dylib_path':
                            'mac/copy_asan_runtime_dylib.sh',
                        },
                        'postbuild_name': 'Copy ASan runtime dylib',
                        'action': [
                          '<(copy_asan_dylib_path)',
                        ],
                      },
                    ],
                  }],
                ],
              }],
            ],
          }],
        ],  # target_conditions
      },  # target_defaults
    }],  # OS=="mac" or OS=="ios"
    ['OS=="mac"', {
      'target_defaults': {
        'variables': {
          # These should end with %, but there seems to be a bug with % in
          # variables that are intended to be set to different values in
          # different targets, like these.
          'mac_pie': 1,        # Most executables can be position-independent.
          # Strip debugging symbols from the target.
          'mac_strip': '<(mac_strip_release)',
          'conditions': [
            ['asan==1', {
              'conditions': [
                ['mac_want_real_dsym=="default"', {
                  'mac_real_dsym': 1,
                }, {
                  'mac_real_dsym': '<(mac_want_real_dsym)'
                }],
              ],
            }, {
              'conditions': [
                ['mac_want_real_dsym=="default"', {
                  'mac_real_dsym': 0, # Fake .dSYMs are fine in most cases.
                }, {
                  'mac_real_dsym': '<(mac_want_real_dsym)'
                }],
              ],
            }],
          ],
        },
        'xcode_settings': {
          'GCC_DYNAMIC_NO_PIC': 'NO',               # No -mdynamic-no-pic
                                                    # (Equivalent to -fPIC)
          # MACOSX_DEPLOYMENT_TARGET maps to -mmacosx-version-min
          'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
          # Keep pch files below xcodebuild/.
          'SHARED_PRECOMPS_DIR': '$(CONFIGURATION_BUILD_DIR)/SharedPrecompiledHeaders',
          'OTHER_CFLAGS': [
            '-fno-strict-aliasing',  # See http://crbug.com/32204
          ],
        },
        'target_conditions': [
          ['_type=="executable"', {
            'postbuilds': [
              {
                # Arranges for data (heap) pages to be protected against
                # code execution when running on Mac OS X 10.7 ("Lion"), and
                # ensures that the position-independent executable (PIE) bit
                # is set for ASLR when running on Mac OS X 10.5 ("Leopard").
                'variables': {
                  # Define change_mach_o_flags in a variable ending in _path
                  # so that GYP understands it's a path and performs proper
                  # relativization during dict merging.
                  'change_mach_o_flags_path':
                      'mac/change_mach_o_flags_from_xcode.sh',
                  'change_mach_o_flags_options%': [
                  ],
                  'target_conditions': [
                    ['mac_pie==0 or release_valgrind_build==1', {
                      # Don't enable PIE if it's unwanted. It's unwanted if
                      # the target specifies mac_pie=0 or if building for
                      # Valgrind, because Valgrind doesn't understand slide.
                      # See the similar mac_pie/release_valgrind_build check
                      # below.
                      'change_mach_o_flags_options': [
                        '--no-pie',
                      ],
                    }],
                  ],
                },
                'postbuild_name': 'Change Mach-O Flags',
                'action': [
                  '<(change_mach_o_flags_path)',
                  '>@(change_mach_o_flags_options)',
                ],
              },
            ],
            'conditions': [
              ['asan==1', {
                'variables': {
                 'asan_saves_file': 'asan.saves',
                },
                'xcode_settings': {
                  'CHROMIUM_STRIP_SAVE_FILE': '<(asan_saves_file)',
                },
              }],
            ],
            'target_conditions': [
              ['mac_pie==1 and release_valgrind_build==0', {
                # Turn on position-independence (ASLR) for executables. When
                # PIE is on for the Chrome executables, the framework will
                # also be subject to ASLR.
                # Don't do this when building for Valgrind, because Valgrind
                # doesn't understand slide. TODO: Make Valgrind on Mac OS X
                # understand slide, and get rid of the Valgrind check.
                'xcode_settings': {
                  'OTHER_LDFLAGS': [
                    '-Wl,-pie',  # Position-independent executable (MH_PIE)
                  ],
                },
              }],
            ],
          }],
          ['(_type=="executable" or _type=="shared_library" or \
             _type=="loadable_module") and mac_strip!=0', {
            'target_conditions': [
              ['mac_real_dsym == 1', {
                # To get a real .dSYM bundle produced by dsymutil, set the
                # debug information format to dwarf-with-dsym.  Since
                # strip_from_xcode will not be used, set Xcode to do the
                # stripping as well.
                'configurations': {
                  'Release_Base': {
                    'xcode_settings': {
                      'DEBUG_INFORMATION_FORMAT': 'dwarf-with-dsym',
                      'DEPLOYMENT_POSTPROCESSING': 'YES',
                      'STRIP_INSTALLED_PRODUCT': 'YES',
                      'target_conditions': [
                        ['_type=="shared_library" or _type=="loadable_module"', {
                          # The Xcode default is to strip debugging symbols
                          # only (-S).  Local symbols should be stripped as
                          # well, which will be handled by -x.  Xcode will
                          # continue to insert -S when stripping even when
                          # additional flags are added with STRIPFLAGS.
                          'STRIPFLAGS': '-x',
                        }],  # _type=="shared_library" or _type=="loadable_module"
                        ['_type=="executable"', {
                          'conditions': [
                            ['asan==1', {
                              'STRIPFLAGS': '-s $(CHROMIUM_STRIP_SAVE_FILE)',
                            }]
                          ],
                        }],  # _type=="executable" and asan==1
                      ],  # target_conditions
                    },  # xcode_settings
                  },  # configuration "Release"
                },  # configurations
              }, {  # mac_real_dsym != 1
                # To get a fast fake .dSYM bundle, use a post-build step to
                # produce the .dSYM and strip the executable.  strip_from_xcode
                # only operates in the Release configuration.
                'postbuilds': [
                  {
                    'variables': {
                      # Define strip_from_xcode in a variable ending in _path
                      # so that gyp understands it's a path and performs proper
                      # relativization during dict merging.
                      'strip_from_xcode_path': 'mac/strip_from_xcode',
                    },
                    'postbuild_name': 'Strip If Needed',
                    'action': ['<(strip_from_xcode_path)'],
                  },
                ],  # postbuilds
              }],  # mac_real_dsym
            ],  # target_conditions
          }],  # (_type=="executable" or _type=="shared_library" or
               #  _type=="loadable_module") and mac_strip!=0
        ],  # target_conditions
      },  # target_defaults
    }],  # OS=="mac"
    ['OS=="ios"', {
      'target_defaults': {
        'xcode_settings' : {
          'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',

          # This next block is mostly common with the 'mac' section above,
          # but keying off (or setting) 'clang' isn't valid for iOS as it
          # also seems to mean using the custom build of clang.

          # TODO(stuartmorgan): switch to c++0x (see TODOs in the clang
          # section above).
          'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++0x',
          # Don't use -Wc++0x-extensions, which Xcode 4 enables by default
          # when building with clang. This warning is triggered when the
          # override keyword is used via the OVERRIDE macro from
          # base/compiler_specific.h.
          'CLANG_WARN_CXX0X_EXTENSIONS': 'NO',
          # Warn if automatic synthesis is triggered with
          # the -Wobjc-missing-property-synthesis flag.
          'CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS': 'YES',
          'WARNING_CFLAGS': [
            '-Wheader-hygiene',
            # Don't die on dtoa code that uses a char as an array index.
            # This is required solely for base/third_party/dmg_fp/dtoa.cc.
            '-Wno-char-subscripts',
            # Clang spots more unused functions.
            '-Wno-unused-function',
            # See comments on this flag higher up in this file.
            '-Wno-unnamed-type-template-args',
            # Match OS X clang C++11 warning settings.
            '-Wno-c++11-narrowing',
            '-Wno-reserved-user-defined-literal',
          ],
        },
        'target_conditions': [
          ['_toolset=="host"', {
            'xcode_settings': {
              'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
              'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
            },
          }],
          ['_toolset=="target"', {
            'xcode_settings': {
              # This section should be for overriding host settings. But,
              # since we can't negate the iphone deployment target above, we
              # instead set it here for target only.
              'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_deployment_target)',
            },
          }],
          ['_type=="executable"', {
            'configurations': {
              'Release_Base': {
                'xcode_settings': {
                  'DEPLOYMENT_POSTPROCESSING': 'YES',
                  'STRIP_INSTALLED_PRODUCT': 'YES',
                },
              },
              'Debug_Base': {
                'xcode_settings': {
                  # Remove dSYM to reduce build time.
                  'DEBUG_INFORMATION_FORMAT': 'dwarf',
                },
              },
            },
            'conditions': [
              ['"<(GENERATOR)"=="xcode"', {
                'xcode_settings': {
                  # TODO(justincohen): ninja builds don't support signing yet.
                  'conditions': [
                    ['chromium_ios_signing', {
                      # iOS SDK wants everything for device signed.
                      'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer',
                    }, {
                      'CODE_SIGNING_REQUIRED': 'NO',
                      'CODE_SIGN_IDENTITY[sdk=iphoneos*]': '',
                    }],
                  ],
                },
              }],
              ['"<(GENERATOR)"=="xcode" and clang!=1', {
                'xcode_settings': {
                  # It is necessary to link with the -fobjc-arc flag to use
                  # subscripting on iOS < 6.
                  'OTHER_LDFLAGS': [
                    '-fobjc-arc',
                  ],
                },
              }],
              ['clang==1', {
                'target_conditions': [
                  ['_toolset=="target"', {
                    'variables': {
                      'developer_dir': '<!(xcode-select -print-path)',
                      'arc_toolchain_path': '<(developer_dir)/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc',
                    },
                    # It is necessary to force load libarclite from Xcode for
                    # third_party/llvm-build because libarclite_* is only
                    # distributed by Xcode.
                    'conditions': [
                      ['"<(GENERATOR)"=="ninja" and target_arch=="armv7"', {
                        'xcode_settings': {
                          'OTHER_LDFLAGS': [
                            '-force_load',
                            '<(arc_toolchain_path)/libarclite_iphoneos.a',
                          ],
                        },
                      }],
                      ['"<(GENERATOR)"=="ninja" and target_arch!="armv7"', {
                        'xcode_settings': {
                          'OTHER_LDFLAGS': [
                            '-force_load',
                            '<(arc_toolchain_path)/libarclite_iphonesimulator.a',
                          ],
                        },
                      }],
                      # Xcode sets target_arch at compile-time.
                      ['"<(GENERATOR)"=="xcode"', {
                        'xcode_settings': {
                          'OTHER_LDFLAGS[arch=armv7]': [
                            '-force_load',
                            '<(arc_toolchain_path)/libarclite_iphoneos.a',
                          ],
                          'OTHER_LDFLAGS[arch=i386]': [
                            '-force_load',
                            '<(arc_toolchain_path)/libarclite_iphonesimulator.a',
                          ],
                        },
                      }],
                    ],
                  }],
                ],
              }],
            ],
          }],
        ],  # target_conditions
      },  # target_defaults
    }],  # OS=="ios"
    ['OS=="win"', {
      'target_defaults': {
        'defines': [
          '_WIN32_WINNT=0x0602',
          'WINVER=0x0602',
          'WIN32',
          '_WINDOWS',
          'NOMINMAX',
          'PSAPI_VERSION=1',
          '_CRT_RAND_S',
          'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',
          'WIN32_LEAN_AND_MEAN',
          '_ATL_NO_OPENGL',
        ],
        'conditions': [
          ['buildtype=="Official"', {
              # In official builds, targets can self-select an optimization
              # level by defining a variable named 'optimize', and setting it
              # to one of
              # - "size", optimizes for minimal code size - the default.
              # - "speed", optimizes for speed over code size.
              # - "max", whole program optimization and link-time code
              #   generation. This is very expensive and should be used
              #   sparingly.
              'variables': {
                'optimize%': 'size',
              },
              'target_conditions': [
                ['optimize=="size"', {
                    'msvs_settings': {
                      'VCCLCompilerTool': {
                        # 1, optimizeMinSpace, Minimize Size (/O1)
                        'Optimization': '1',
                        # 2, favorSize - Favor small code (/Os)
                        'FavorSizeOrSpeed': '2',
                      },
                    },
                  },
                ],
                ['optimize=="speed"', {
                    'msvs_settings': {
                      'VCCLCompilerTool': {
                        # 2, optimizeMaxSpeed, Maximize Speed (/O2)
                        'Optimization': '2',
                        # 1, favorSpeed - Favor fast code (/Ot)
                        'FavorSizeOrSpeed': '1',
                      },
                    },
                  },
                ],
                ['optimize=="max"', {
                    'msvs_settings': {
                      'VCCLCompilerTool': {
                        # 2, optimizeMaxSpeed, Maximize Speed (/O2)
                        'Optimization': '2',
                        # 1, favorSpeed - Favor fast code (/Ot)
                        'FavorSizeOrSpeed': '1',
                        # This implies link time code generation.
                        'WholeProgramOptimization': 'true',
                      },
                    },
                  },
                ],
              ],
            },
          ],
          ['component=="static_library"', {
            'defines': [
              '_HAS_EXCEPTIONS=0',
            ],
          }],
          ['secure_atl', {
            'defines': [
              '_SECURE_ATL',
            ],
          }],
          ['msvs_express', {
            'configurations': {
              'x86_Base': {
                'msvs_settings': {
                  'VCLinkerTool': {
                    'AdditionalLibraryDirectories':
                      ['<(windows_driver_kit_path)/lib/ATL/i386'],
                  },
                  'VCLibrarianTool': {
                    'AdditionalLibraryDirectories':
                      ['<(windows_driver_kit_path)/lib/ATL/i386'],
                  },
                },
              },
              'x64_Base': {
                'msvs_settings': {
                  'VCLibrarianTool': {
                    'AdditionalLibraryDirectories':
                      ['<(windows_driver_kit_path)/lib/ATL/amd64'],
                  },
                  'VCLinkerTool': {
                    'AdditionalLibraryDirectories':
                      ['<(windows_driver_kit_path)/lib/ATL/amd64'],
                  },
                },
              },
            },
            'msvs_settings': {
              'VCLinkerTool': {
                # Explicitly required when using the ATL with express
                'AdditionalDependencies': ['atlthunk.lib'],

                # ATL 8.0 included in WDK 7.1 makes the linker to generate
                # almost eight hundred LNK4254 and LNK4078 warnings:
                #   - warning LNK4254: section 'ATL' (50000040) merged into
                #     '.rdata' (40000040) with different attributes
                #   - warning LNK4078: multiple 'ATL' sections found with
                #     different attributes
                'AdditionalOptions': ['/ignore:4254', '/ignore:4078'],
              },
            },
            'msvs_system_include_dirs': [
              '<(windows_driver_kit_path)/inc/atl71',
              '<(windows_driver_kit_path)/inc/mfc42',
            ],
          }],
        ],
        'msvs_system_include_dirs': [
          '<(windows_sdk_path)/Include/shared',
          '<(windows_sdk_path)/Include/um',
          '<(windows_sdk_path)/Include/winrt',
          '$(VSInstallDir)/VC/atlmfc/include',
        ],
        'msvs_cygwin_dirs': ['<(DEPTH)/third_party/cygwin'],
        'msvs_disabled_warnings': [4351, 4355, 4396, 4503, 4819,
          # TODO(maruel): These warnings are level 4. They will be slowly
          # removed as code is fixed.
          4100, 4121, 4125, 4127, 4130, 4131, 4189, 4201, 4238, 4244, 4245,
          4310, 4428, 4481, 4505, 4510, 4512, 4530, 4610, 4611, 4701, 4702,
          4706,
        ],
        'msvs_settings': {
          'VCCLCompilerTool': {
            'AdditionalOptions': ['/MP'],
            'MinimalRebuild': 'false',
            'BufferSecurityCheck': 'true',
            'EnableFunctionLevelLinking': 'true',
            'RuntimeTypeInfo': 'false',
            'WarningLevel': '4',
            'WarnAsError': 'true',
            'DebugInformationFormat': '3',
            'conditions': [
              ['component=="shared_library"', {
                'ExceptionHandling': '1',  # /EHsc
              }, {
                'ExceptionHandling': '0',
              }],
            ],
          },
          'VCLibrarianTool': {
            'AdditionalOptions': ['/ignore:4221'],
            'AdditionalLibraryDirectories': [
              '<(windows_sdk_path)/Lib/win8/um/x86',
            ],
          },
          'VCLinkerTool': {
            'AdditionalDependencies': [
              'wininet.lib',
              'dnsapi.lib',
              'version.lib',
              'msimg32.lib',
              'ws2_32.lib',
              'usp10.lib',
              'psapi.lib',
              'dbghelp.lib',
              'winmm.lib',
              'shlwapi.lib',
            ],
            'AdditionalLibraryDirectories': [
              '<(windows_sdk_path)/Lib/win8/um/x86',
            ],
            'GenerateDebugInformation': 'true',
            'MapFileName': '$(OutDir)\\$(TargetName).map',
            'ImportLibrary': '$(OutDir)\\lib\\$(TargetName).lib',
            'FixedBaseAddress': '1',
            # SubSystem values:
            #   0 == not set
            #   1 == /SUBSYSTEM:CONSOLE
            #   2 == /SUBSYSTEM:WINDOWS
            # Most of the executables we'll ever create are tests
            # and utilities with console output.
            'SubSystem': '1',
          },
          'VCMIDLTool': {
            'GenerateStublessProxies': 'true',
            'TypeLibraryName': '$(InputName).tlb',
            'OutputDirectory': '$(IntDir)',
            'HeaderFileName': '$(InputName).h',
            'DLLDataFileName': '$(InputName).dlldata.c',
            'InterfaceIdentifierFileName': '$(InputName)_i.c',
            'ProxyFileName': '$(InputName)_p.c',
          },
          'VCResourceCompilerTool': {
            'Culture' : '1033',
            'AdditionalIncludeDirectories': [
              '<(DEPTH)',
              '<(SHARED_INTERMEDIATE_DIR)',
            ],
          },
        },
      },
    }],
    ['disable_nacl==1', {
      'target_defaults': {
        'defines': [
          'DISABLE_NACL',
        ],
      },
    }],
    ['OS=="win" and msvs_use_common_linker_extras', {
      'target_defaults': {
        'msvs_settings': {
          'VCLinkerTool': {
            'DelayLoadDLLs': [
              'dbghelp.dll',
              'dwmapi.dll',
              'shell32.dll',
              'uxtheme.dll',
            ],
          },
        },
        'configurations': {
          'x86_Base': {
            'msvs_settings': {
              'VCLinkerTool': {
                'AdditionalOptions': [
                  '/safeseh',
                  '/dynamicbase',
                  '/ignore:4199',
                  '/ignore:4221',
                  '/nxcompat',
                ],
              },
            },
          },
          'x64_Base': {
            'msvs_settings': {
              'VCLinkerTool': {
                'AdditionalOptions': [
                  # safeseh is not compatible with x64
                  '/dynamicbase',
                  '/ignore:4199',
                  '/ignore:4221',
                  '/nxcompat',
                ],
              },
            },
          },
        },
      },
    }],
    ['enable_new_npdevice_api==1', {
      'target_defaults': {
        'defines': [
          'ENABLE_NEW_NPDEVICE_API',
        ],
      },
    }],
    # Don't warn about the "typedef 'foo' locally defined but not used"
    # for gcc 4.8.
    # TODO: remove this flag once all builds work. See crbug.com/227506
    ['gcc_version>=48', {
      'target_defaults': {
        'cflags': [
          '-Wno-unused-local-typedefs',
        ],
      },
    }],
    ['clang==1', {
      'conditions': [
        ['OS=="android"', {
          # Android could use the goma with clang.
          'make_global_settings': [
            ['CC', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} ${CHROME_SRC}/<(make_clang_dir)/bin/clang)'],
            ['CXX', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} ${CHROME_SRC}/<(make_clang_dir)/bin/clang++)'],
            ['LINK', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} ${CHROME_SRC}/<(make_clang_dir)/bin/clang++)'],
            ['CC.host', '$(CC)'],
            ['CXX.host', '$(CXX)'],
            ['LINK.host', '$(LINK)'],
          ],
        }, {
          'make_global_settings': [
            ['CC', '<(make_clang_dir)/bin/clang'],
            ['CXX', '<(make_clang_dir)/bin/clang++'],
            ['LINK', '$(CXX)'],
            ['CC.host', '$(CC)'],
            ['CXX.host', '$(CXX)'],
            ['LINK.host', '$(LINK)'],
          ],
        }],
      ],
    }],
    ['OS=="android" and clang==0', {
      # Hardcode the compiler names in the Makefile so that
      # it won't depend on the environment at make time.
      'make_global_settings': [
        ['CC', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <(android_toolchain)/*-gcc)'],
        ['CXX', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <(android_toolchain)/*-g++)'],
        ['LINK', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <(android_toolchain)/*-gcc)'],
        ['CC.host', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <!(which gcc))'],
        ['CXX.host', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <!(which g++))'],
        ['LINK.host', '<!(/bin/echo -n ${ANDROID_GOMA_WRAPPER} <!(which g++))'],
      ],
    }],
    ['OS=="linux" and target_arch=="mipsel"', {
      'make_global_settings': [
        ['CC', '<(sysroot)/../bin/mipsel-linux-gnu-gcc'],
        ['CXX', '<(sysroot)/../bin/mipsel-linux-gnu-g++'],
        ['LINK', '$(CXX)'],
        ['CC.host', '<!(which gcc)'],
        ['CXX.host', '<!(which g++)'],
        ['LINK.host', '<!(which g++)'],
      ],
    }],
  ],
  'xcode_settings': {
    # DON'T ADD ANYTHING NEW TO THIS BLOCK UNLESS YOU REALLY REALLY NEED IT!
    # This block adds *project-wide* configuration settings to each project
    # file.  It's almost always wrong to put things here.  Specify your
    # custom xcode_settings in target_defaults to add them to targets instead.

    'conditions': [
      # In an Xcode Project Info window, the "Base SDK for All Configurations"
      # setting sets the SDK on a project-wide basis. In order to get the
      # configured SDK to show properly in the Xcode UI, SDKROOT must be set
      # here at the project level.
      ['OS=="mac"', {
        'conditions': [
          ['mac_sdk_path==""', {
            'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
          }, {
            'SDKROOT': '<(mac_sdk_path)',  # -isysroot
          }],
        ],
      }],
      ['OS=="ios"', {
        'conditions': [
          ['ios_sdk_path==""', {
            'conditions': [
              # TODO(justincohen): Ninja only supports simulator for now.
              ['"<(GENERATOR)"=="ninja"', {
                'SDKROOT': 'iphonesimulator<(ios_sdk)',  # -isysroot
              }, {
                'SDKROOT': 'iphoneos<(ios_sdk)',  # -isysroot
              }],
            ],
          }, {
            'SDKROOT': '<(ios_sdk_path)',  # -isysroot
          }],
        ],
      }],
      ['OS=="ios"', {
        'ARCHS': '$(ARCHS_UNIVERSAL_IPHONE_OS)',
        # Just build armv7, until armv7s is correctly tested.
        'VALID_ARCHS': 'armv7 i386',
        # Target both iPhone and iPad.
        'TARGETED_DEVICE_FAMILY': '1,2',
      }],
      ['target_arch=="x64"', {
        'ARCHS': [
          'x86_64'
         ],
      }],
    ],

    # The Xcode generator will look for an xcode_settings section at the root
    # of each dict and use it to apply settings on a file-wide basis.  Most
    # settings should not be here, they should be in target-specific
    # xcode_settings sections, or better yet, should use non-Xcode-specific
    # settings in target dicts.  SYMROOT is a special case, because many other
    # Xcode variables depend on it, including variables such as
    # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
    # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
    # files to appear (when present) in the UI as actual files and not red
    # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
    # and therefore SYMROOT, needs to be set at the project level.
    'SYMROOT': '<(DEPTH)/xcodebuild',
  },
}