Add initial prototype for the GN meta-buildsystem.

This is currently not hooked into the build. To build, add a reference to the
gn.gyp file to build/all.gyp

R=darin@chromium.org, scottmg@chromium.org

Review URL: https://codereview.chromium.org/21114002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@214254 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 1209 insertions, 0 deletions

diff --git a/tools/gn/secondary/build/config/BUILD.gn b/tools/gn/secondary/build/config/BUILD.gn
new file mode 100644
index 0000000..74c57af
--- /dev/null
+++ b/tools/gn/secondary/build/config/BUILD.gn
@@ -0,0 +1,52 @@
+config("my_msvs") {

+  includes = [ "../.." ]

+  cflags = [

+       "/Od", "/WX", "/Zi", "/Gy", "/GS", "/RTC1", "/EHsc",

+  ]

+  defines = [

+      "CHROMIUM_BUILD",

+      "TOOLKIT_VIEWS=1",

+      "USE_LIBJPEG_TURBO=1",

+      "ENABLE_ONE_CLICK_SIGNIN",

+      "ENABLE_REMOTING=1",

+      "ENABLE_WEBRTC=1",

+      "ENABLE_CONFIGURATION_POLICY",

+      "ENABLE_INPUT_SPEECH",

+      "ENABLE_NOTIFICATIONS",

+      "ENABLE_GPU=1",

+      "ENABLE_EGLIMAGE=1",

+      "ENABLE_TASK_MANAGER=1",

+      "ENABLE_EXTENSIONS=1",

+      "ENABLE_PLUGIN_INSTALLATION=1",

+      "ENABLE_PLUGINS=1",

+      "ENABLE_SESSION_SERVICE=1",

+      "ENABLE_THEMES=1",

+      "ENABLE_AUTOFILL_DIALOG=1",

+      "ENABLE_BACKGROUND=1",

+      "ENABLE_AUTOMATION=1",

+      "ENABLE_GOOGLE_NOW=1",

+      "ENABLE_LANGUAGE_DETECTION=1",

+      "ENABLE_PRINTING=1",

+      "ENABLE_CAPTIVE_PORTAL_DETECTION=1",

+      "ENABLE_APP_LIST=1",

+      "ENABLE_MESSAGE_CENTER=1",

+      "ENABLE_SETTINGS_APP=1",

+      "ENABLE_MANAGED_USERS=1",

+  ]

+}

+

+config("feature_flags") {

+  #defines = 

+}

+

+config("debug") {

+  defines = [

+    "_DEBUG",

+    "DYNAMIC_ANNOTATIONS_ENABLED=1",

+    "WTF_USE_DYNAMIC_ANNOTATIONS=1",

+  ]

+}

+

+config("release") {

+

+}

diff --git a/tools/gn/secondary/build/config/BUILDCONFIG.gn b/tools/gn/secondary/build/config/BUILDCONFIG.gn
new file mode 100644
index 0000000..0245597
--- /dev/null
+++ b/tools/gn/secondary/build/config/BUILDCONFIG.gn
@@ -0,0 +1,187 @@
+# =============================================================================

+# BUILD FLAGS

+# =============================================================================

+#

+# This block lists input arguments to the build, along with their default

+# values. GN requires listing them explicitly so it can validate input and have

+# a central place to manage the build flags.

+#

+# If a value is specified on the command line, it will overwrite the defaults

+# given here, otherwise the default will be injected into the root scope.

+#

+# KEEP IN ALPHABETICAL ORDER and write a good description for everything.

+# Use "is_*" names for intrinsic platform descriptions and build modes, and

+# "use_*" names for optional features libraries, and configurations.

+declare_args() {

+  is_component_build = 1

+  is_chromeos = 0

+  is_debug = 1

+  use_ash = 0

+  use_aura = 0

+  use_ozone = 0

+}

+

+# =============================================================================

+# SOURCES FILTERS

+# =============================================================================

+#

+# These patterns filter out platform-specific files when assigning to the

+# sources variable. The magic variable |sources_assignment_filter| is applied

+# to each assignment or appending to the sources variable and matches are

+# automatcally removed.

+#

+# We define lists of filters for each platform for all builds so they can

+# be used by individual targets if necessary (a target can always change

+# sources_assignment_filter on itself if it needs something more specific).

+#

+# Note that the patterns are NOT regular expressions. Only "*" and "\b" (path

+# boundary = end of string or slash) are supported, and the entire string

+# muct match the pattern (so you need "*.cc" to match all .cc files, for

+# example).

+

+windows_sources_filters = [

+  "*_win.cc",

+  "*_win.h",

+  "*_win_unittest.cc",

+  "*\bwin/*",

+]

+mac_sources_filters = [

+  "*_mac.h",

+  "*_mac.cc",

+  "*_mac.mm",

+  "*_mac_unittest.h",

+  "*_mac_unittest.cc",

+  "*_mac_unittest.mm",

+  "*\bmac/*",

+  "*_cocoa.h",

+  "*_cocoa.cc",

+  "*_cocoa.mm",

+  "*_cocoa_unittest.h",

+  "*_cocoa_unittest.cc",

+  "*_cocoa_unittest.mm",

+  "*\bcocoa/*",

+]

+ios_sources_filters = [

+  "*_ios.h",

+  "*_ios.cc",

+  "*_ios.mm",

+  "*_ios_unittest.h",

+  "*_ios_unittest.cc",

+  "*_ios_unittest.mm",

+  "*\bios/*",

+]

+objective_c_sources_filters = [

+  "*.mm",

+]

+linux_sources_filters = [

+  "*_linux.h",

+  "*_linux.cc",

+  "*_linux_unittest.h",

+  "*_linux_unittest.cc",

+  "*\blinux/*",

+]

+android_sources_filters = [

+  "*_android.h",

+  "*_android.cc",

+  "*_android_unittest.h",

+  "*_android_unittest.cc",

+  "*\bandroid/*",

+]

+posix_sources_filters = [

+  "*_posix.h",

+  "*_posix.cc",

+  "*_posix_unittest.h",

+  "*_posix_unittest.cc",

+  "*\bposix/*",

+]

+

+# Construct the full list of sources we're using for this platform.

+sources_assignment_filter = []

+if (is_win) {

+  sources_assignment_filter += posix_sources_filters

+} else {

+  sources_assignment_filter += windows_sources_filters

+}

+if (!is_mac) {

+  sources_assignment_filter += mac_sources_filters

+}

+if (!is_ios) {

+  sources_assignment_filter += ios_sources_filters

+}

+if (!is_mac && !is_ios) {

+  sources_assignment_filter += objective_c_sources_filters

+}

+if (!is_linux) {

+  sources_assignment_filter += linux_sources_filters

+}

+if (!is_android) {

+  sources_assignment_filter += android_sources_filters

+}

+

+# This is the actual set.

+set_sources_assignment_filter(sources_assignment_filter)

+

+# =============================================================================

+# SYSTEM CONFIG

+# =============================================================================

+

+is_nacl = 0

+

+# =============================================================================

+# BUILD OPTIONS

+# =============================================================================

+

+if (is_component_build) {

+  component_mode = "shared_library"

+} else {

+  component_mode = "static_library"

+}

+

+# =============================================================================

+# TARGET DEFAULTS

+# =============================================================================

+#

+# Set up the default configuration for every build target of the given type.

+# The values configured here will be automatically set on the scope of the

+# corresponding target. Target definitions can add or remove to the settings

+# here as needed.

+

+# Holds all configs used for making native executables and libraries, to avoid

+# duplication in each target below.

+native_compiler_configs = [

+  "//build/config:my_msvs",  # TODO(brettw) eraseme

+

+  "//build/config/compiler:chromium_code",

+  "//build/config/compiler:disable_annoying_warnings",

+  "//build/config/compiler:no_rtti",

+  "//build/config/compiler:runtime_library",

+]

+if (is_win) {

+  native_compiler_configs += "//build/config/win:sdk"

+}

+

+if (is_debug) {

+  native_compiler_configs += "//build/config:debug"

+} else {

+  native_compiler_configs += "//build/config::release"

+}

+

+set_defaults("executable") {

+  configs = native_compiler_configs

+}

+

+set_defaults("static_library") {

+  configs = native_compiler_configs

+}

+

+set_defaults("shared_library") {

+  configs = native_compiler_configs

+}

+

+# ==============================================================================

+# TOOLCHAIN SETUP

+# ==============================================================================

+

+if (is_win) {

+  set_default_toolchain("//build/config/win:32")

+}

diff --git a/tools/gn/secondary/build/config/compiler/BUILD.gn b/tools/gn/secondary/build/config/compiler/BUILD.gn
new file mode 100644
index 0000000..0487828
--- /dev/null
+++ b/tools/gn/secondary/build/config/compiler/BUILD.gn
@@ -0,0 +1,134 @@
+# Copyright (c) 2013 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.

+

+# runtime_library -------------------------------------------------------------

+#

+# Sets the runtime library and associated options.

+#

+# We don't bother making multiple versions that are toggle-able since there

+# is more than one axis of control (which makes it complicated) and there's

+# no practical reason for anybody to change this since the CRT must agree.

+

+config("runtime_library") {

+  if (is_component_build) {

+    # Component mode: dynamic CRT.

+    defines = [ "COMPONENT_BUILD" ]

+    if (is_win) {

+      # Since the library is shared, it requires exceptions or will give errors

+      # about things not matching, so keep exceptions on.

+      if (is_debug) {

+        cflags = [ "/MDd" ]

+      } else {

+        cflags = [ "/MD" ]

+      }

+    }

+  } else {

+    # Static CRT.

+    if (is_win) {

+      # We don't use exceptions, and when we link statically we can just get

+      # rid of them entirely.

+      defines = [ "_HAS_EXCEPTIONS=0" ]

+      if (is_debug) {

+        cflags = [ "/MTd" ]

+      } else {

+        cflags = [ "/MT" ]

+      }

+    }

+  }

+

+  if (is_win) {

+    defines += [

+      "__STD_C",

+      "__STDC_CONSTANT_MACROS",

+      "__STDC_FORMAT_MACROS",

+      "_CRT_RAND_S",

+      "_CRT_SECURE_NO_DEPRECATE",

+      "_SCL_SECURE_NO_DEPRECATE",

+      "_UNICODE",

+      "UNICODE", 

+    ]

+  }

+}

+

+# chromium_code ---------------------------------------------------------------

+#

+# Toggles between higher and lower warnings for code that is (or isn't)

+# part of Chromium.

+

+config("chromium_code") {

+  if (is_win) {

+    cflags = [

+      "/W4",  # Warning level 4.

+    ]

+  }

+}

+config("no_chromium_code") {

+  if (is_win) {

+    cflags = [

+      "/W3",  # Warning level 3.

+      "/wd4800",  # Disable warning when forcing value to bool.

+    ]

+    defines = [

+      "_CRT_NONSTDC_NO_WARNINGS",

+      "_CRT_NONSTDC_NO_DEPRECATE",

+    ]

+  }

+}

+

+# rtti ------------------------------------------------------------------------

+#

+# Allows turning Run-Time Type Identification on or off.

+

+config("rtti") {

+  if (is_win) {

+    cflags = [ "/GR" ]

+  }

+}

+config("no_rtti") {

+  if (is_win) {

+    cflags = [ "/GR-" ]

+  }

+}

+

+# Warnings ---------------------------------------------------------------------

+

+config("disable_annoying_warnings") {

+  if (is_win) {

+    # Please keep ordered and add names if you add more.

+    cflags = [

+      "/wd4018",  # Comparing signed and unsigned values.

+      "/wd4100",  # Unreferenced formal function parameter.

+      "/wd4121",  # Alignment of a member was sensitive to packing.

+      "/wd4125",  # Decimal digit terminates octal escape sequence.

+      "/wd4127",  # Conditional expression is constant.

+      "/wd4130",  # Logical operation on address of string constant.

+      # TODO(brettw) is this necessary? If so, it should probably be on whoever

+      # is silly enough to be doing this rather than globally.

+      #"/wd4131",  # Function uses old-style declarator.

+      "/wd4189",  # A variable was declared and initialized but never used.

+      "/wd4201",  # Nonstandard extension used: nameless struct/union.

+      "/wd4238",  # Nonstandard extension used: class rvalue used as lvalue.

+      "/wd4244",  # Conversion: possible loss of data.

+      "/wd4245",  # Conversion: signed/unsigned mismatch,

+      "/wd4251",  # Class needs to have dll-interface.

+      "/wd4310",  # Cast truncates constant value.

+      "/wd4351",  # Elements of array will be default initialized.

+      "/wd4355",  # 'this' used in base member initializer list.

+      "/wd4396",  # Inline friend template thing.

+      "/wd4428",  # Universal character name encountered in source.

+      "/wd4481",  # Nonstandard extension: override specifier.

+      "/wd4503",  # Decorated name length exceeded, name was truncated.

+      "/wd4505",  # Unreferenced local function has been removed.

+      "/wd4510",  # Default constructor could not be generated.

+      "/wd4512",  # Assignment operator could not be generated.

+      "/wd4530",  # Exception handler used, but unwind semantics not enabled.

+      "/wd4610",  # Class can never be instantiated, constructor required.

+      "/wd4611",  # C++ object destruction and 'catch'.

+      "/wd4701",  # Potentially uninitialized local variable name used.

+      "/wd4702",  # Unreachable code.

+      "/wd4706",  # Assignment within conditional expression.

+      "/wd4819",  # Character not in the current code page.

+    ]

+  }

+}

diff --git a/tools/gn/secondary/build/config/win/BUILD.gn b/tools/gn/secondary/build/config/win/BUILD.gn
new file mode 100644
index 0000000..955504a
--- /dev/null
+++ b/tools/gn/secondary/build/config/win/BUILD.gn
@@ -0,0 +1,184 @@
+# Copyright (c) 2013 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.

+

+# Should only be running on Windows.

+assert(is_win)

+

+# Setup the Visual Studio state.

+#

+# Its argument is the location to write the environment files.

+# It will write "environment.x86" and "environment.x64" to this directory,

+# and return a list to us.

+#

+# The list contains the include path as its only element. (I'm expecting to

+# add more so it's currently a list inside a list.)

+msvc_config = [["foo"]]

+#exec_script("get_msvc_config.py",

+                     #     [relative_root_output_dir],

+                     #     "value")

+

+# 32-bit toolchain -------------------------------------------------------------

+

+toolchain("32") {

+  tool("cc") {

+    command = "ninja -t msvc -e \$arch -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"

+    description = "CC \$out"

+    rspfile = "\$out.rsp"

+    rspfile_content = "\$defines \$includes \$cflags \$cflags_c"

+    deps = "msvc"

+  }

+  tool("cxx") {

+    command = "ninja -t msvc -e \$arch -- cl.exe /nologo /showIncludes /FC @\$out.rsp /c \$in /Fo\$out /Fd\$pdbname"

+    description = "CXX \$out"

+    rspfile = "\$out.rsp"

+    rspfile_content = "\$defines \$includes \$cflags \$cflags_cc"

+    deps = "msvc"

+  }

+  #tool("idl") {

+  #  command = $python_path gyp-win-tool midl-wrapper \$arch \$outdir \$tlb \$h \$dlldata \$iid \$

+  #      \$proxy \$in \$idlflags

+  #  description = IDL \$in

+  #}

+  #tool("rc") {

+  #  command = $python_path gyp-win-tool rc-wrapper \$arch rc.exe \$defines \$includes \$rcflags \$

+  #      /fo\$out \$in

+  #  description = RC \$in

+  #}

+  #tool("asm") {

+  #  command = $python_path gyp-win-tool asm-wrapper \$arch ml.exe \$defines \$includes /c /Fo \$

+  #      \$out \$in

+  #  description = ASM \$in

+  #}

+  tool("alink") {

+    command = "$python_path gyp-win-tool link-wrapper \$arch lib.exe /nologo /ignore:4221 /OUT:\$out @\$out.rsp"

+    description = "LIB \$out"

+    rspfile = "\$out.rsp"

+    rspfile_content = "\$in_newline \$libflags"

+  }

+  #tool("solink_embed_inc") {

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag \$

+  #      /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && \$

+  #      $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests \$

+  #      -out:\$dll.manifest && $python_path gyp-win-tool manifest-to-rc \$arch \$dll.manifest \$

+  #      \$dll.manifest.rc 2 && $python_path gyp-win-tool rc-wrapper \$arch rc.exe \$

+  #      \$dll.manifest.rc && $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$

+  #      \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp \$dll.manifest.res

+  #  description = LINK_EMBED_INC(DLL) \$dll

+  #  restat = 1

+  #  rspfile = \$dll.rsp

+  #  rspfile_content = \$libs \$in_newline \$ldflags

+  #}

+  #tool("solink_module_embed_inc") {

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag \$

+  #      /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && \$

+  #      $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests \$

+  #      -out:\$dll.manifest && $python_path gyp-win-tool manifest-to-rc \$arch \$dll.manifest \$

+  #      \$dll.manifest.rc 2 && $python_path gyp-win-tool rc-wrapper \$arch rc.exe \$

+  #      \$dll.manifest.rc && $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$

+  #      \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp \$dll.manifest.res

+  #  description = LINK_EMBED_INC(DLL) \$dll

+  #  restat = 1

+  #  rspfile = \$dll.rsp

+  #  rspfile_content = \$libs \$in_newline \$ldflags

+  #}

+  #rule link_embed_inc

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo /OUT:\$out \$

+  #      /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper \$arch cmd /c \$

+  #      if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests -out:\$out.manifest && \$

+  #      $python_path gyp-win-tool manifest-to-rc \$arch \$out.manifest \$out.manifest.rc 1 && \$

+  #      $python_path gyp-win-tool rc-wrapper \$arch rc.exe \$out.manifest.rc && \$

+  #      $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo /OUT:\$out /PDB:\$out.pdb \$

+  #      @\$out.rsp \$out.manifest.res

+  #  description = LINK_EMBED_INC \$out

+  #  rspfile = \$out.rsp

+  #  rspfile_content = \$in_newline \$libs \$ldflags

+  #rule solink_embed

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag \$

+  #      /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && \$

+  #      $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests \$

+  #      -outputresource:\$dll;2

+  #  description = LINK_EMBED(DLL) \$dll

+  #  restat = 1

+  #  rspfile = \$dll.rsp

+  #  rspfile_content = \$libs \$in_newline \$ldflags

+  #rule solink_module_embed

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag \$

+  #      /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && \$

+  #      $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests \$

+  #      -outputresource:\$dll;2

+  #  description = LINK_EMBED(DLL) \$dll

+  #  restat = 1

+  #  rspfile = \$dll.rsp

+  #  rspfile_content = \$libs \$in_newline \$ldflags

+  #rule link_embed

+  #  command = cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo /OUT:\$out \$

+  #      /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper \$arch cmd /c \$

+  #      if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool \$

+  #      manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests -outputresource:\$out;1

+  #  description = LINK_EMBED \$out

+  #  rspfile = \$out.rsp

+  #  rspfile_content = \$in_newline \$libs \$ldflags

+  tool("solink") {

+    command = "cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"

+    description = "LINK(DLL) \$dll"

+    restat = "1"

+    rspfile = "\$dll.rsp"

+    rspfile_content = "\$libs \$in_newline \$ldflags"

+  }

+  tool("solink_module") {

+    command = "cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper \$arch cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests -out:\$dll.manifet"

+    description = "LINK(DLL) \$dll"

+    restat = "1"

+    rspfile = "\$dll.rsp"

+    rspfile_content = "\$libs \$in_newline \$ldflags"

+  }

+  tool("link") {

+    command = "cmd /c $python_path gyp-win-tool link-wrapper \$arch link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper \$arch cmd /c if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool manifest-wrapper \$arch mt.exe -nologo -manifest \$manifests -out:\$out.manifest"

+    description = "LINK \$out"

+    rspfile = "\$out.rsp"

+    rspfile_content = "\$in_newline \$libs \$ldflags"

+  }

+  tool("stamp") {

+    command = "$python_path gyp-win-tool stamp \$out"

+    description = "STAMP \$out"

+  }

+  tool("copy") {

+    command = "$python_path gyp-win-tool recursive-mirror \$in \$out"

+    description = "COPY \$in \$out"

+  }

+}

+

+# 64-bit toolchain -------------------------------------------------------------

+

+toolchain("64") {

+}

+

+# SDK setup --------------------------------------------------------------------

+

+config("sdk") {

+  # The include path is the stuff returned by the script plus out own WTL

+  # checkout.

+  # TODO(brettw) should adding WTL be at this level or should it be more on

+  # a per-project basis?

+  includes = msvc_config[0] + "../../third_party/wtl/include"

+

+  defines = [

+    "_ATL_NO_OPENGL",

+    "_SECURE_ATL",

+    "_WIN32_WINNT=0x0602",

+    "_WINDOWS",

+    "CERT_CHAIN_PARA_HAS_EXTRA_FIELDS",

+    "NOMINMAX",

+    "NTDDI_VERSION=0x06020000",

+    "PSAPI_VERSION=1",

+    "WIN32",

+    "WIN32_LEAN_AND_MEAN",

+    "WINVER=0x0602",

+  ]

+}

diff --git a/tools/gn/secondary/build/config/win/get_msvc_config.py b/tools/gn/secondary/build/config/win/get_msvc_config.py
new file mode 100644
index 0000000..01380cd
--- /dev/null
+++ b/tools/gn/secondary/build/config/win/get_msvc_config.py
@@ -0,0 +1,77 @@
+# Copyright (c) 2013 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.
+
+# This file returns the MSVC config used by the Windows build.
+# It's a bit hardcoded right now. I suspect we want to build this functionality
+# into GN itself in the future.
+
+import sys
+
+# This script expects one parameter: the path to the root output directory.
+
+# TODO(brettw): do escaping.
+def FormatStringForGN(x):
+  return '"' + x + '"'
+
+def PrintListOfStrings(x):
+  print '['
+  for i in x:
+    print FormatStringForGN(i) + ', '
+  print ']'
+
+# GN wants system-absolutepaths to begin in slashes.
+sdk_root = '/C:\\Program Files (x86)\\Windows Kits\\8.0\\'
+vs_root = '/C:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\'
+
+def GetIncludes():
+  return [
+    sdk_root + 'Include\\shared',
+    sdk_root + 'Include\\um',
+    sdk_root + 'Include\\winrt',
+    vs_root + 'VC\\atlmfc\\include'
+  ]
+
+def _FormatAsEnvironmentBlock(envvar_dict):
+  """Format as an 'environment block' directly suitable for CreateProcess.
+  Briefly this is a list of key=value\0, terminated by an additional \0. See
+  CreateProcess documentation for more details."""
+  block = ''
+  nul = '\0'
+  for key, value in envvar_dict.iteritems():
+    block += key + '=' + value + nul
+  block += nul
+  return block
+
+def WriteEnvFile(file_path, values):
+  f = open(file_path, "w")
+  f.write(_FormatAsEnvironmentBlock(values))
+
+includes = GetIncludes()
+
+# Write the environment files.
+WriteEnvFile(sys.argv[1] + '\\environment.x86',
+  { 'TMP': 'C:\\Users\\brettw\\AppData\\Local\\Temp',
+    'SYSTEMROOT': 'C:\\Windows',
+    'TEMP': 'C:\\Users\\brettw\\AppData\\Local\\Temp',
+    'LIB': 'c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\lib;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\lib;',
+    'LIBPATH': 'C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;',
+    'PATH': 'C:\\apps\\depot_tools\\python_bin;c:\\Program Files (x86)\\Microsoft F#\\v4.0\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VSTSDB\\Deploy;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\IDE\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\BIN;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\Tools;C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\VCPackages;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin\\NETFX 4.0 Tools;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin;C:\\apps\\depot_tools\\python_bin;C:\\apps\\depot_tools\\;C:\\apps\\depot_tools\\;C:\\apps\\depot_tools\\;c:\\Program Files (x86)\\Microsoft F#\\v4.0\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VSTSDB\\Deploy;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\IDE\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\BIN;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\Tools;C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\VCPackages;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin\\NETFX 4.0 Tools;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\windows\\corpam;C:\\python_26_amd64\\files;C:\\Windows\\ccmsetup;c:\\Program Files (x86)\\Microsoft SQL Server\\100\\Tools\\Binn\\;c:\\Program Files\\Microsoft SQL Server\\100\\Tools\\Binn\\;c:\\Program Files\\Microsoft SQL Server\\100\\DTS\\Binn\\;c:\\cygwin\\bin;C:\\apps\\;C:\\apps\\depot_tools;C:\\Program Files (x86)\\Windows Kits\\8.0\\Windows Performance Toolkit\\;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files (x86)\\Google\\Cert Installer;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files (x86)\\Google\\google_appengine\\',
+    'PATHEXT': '=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC',
+    'INCLUDE': 'c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\INCLUDE;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\include;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\INCLUDE;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\include;'})
+
+WriteEnvFile(sys.argv[1] + '\\environment.x64',
+  { 'TMP': 'C:\\Users\\brettw\\AppData\\Local\\Temp',
+    'SYSTEMROOT': 'C:\\Windows',
+    'TEMP': 'C:\\Users\\brettw\\AppData\\Local\\Temp',
+    'LIB': 'c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB\\amd64;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB\\amd64;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\lib\\x64;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\lib;',
+    'LIBPATH': 'C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework64\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB\\amd64;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB\\amd64;C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\LIB;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\LIB;',
+    'PATH': 'C:\\apps\\depot_tools\\python_bin;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\BIN\\amd64;C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework64\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\VCPackages;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\IDE;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\Tools;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin\\NETFX 4.0 Tools\\x64;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin\\x64;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin;C:\\apps\\depot_tools\\python_bin;C:\\apps\\depot_tools\\;C:\\apps\\depot_tools\\;C:\\apps\\depot_tools\\;c:\\Program Files (x86)\\Microsoft F#\\v4.0\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VSTSDB\\Deploy;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\IDE\\;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\BIN;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\Common7\\Tools;C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319;C:\\Windows\\Microsoft.NET\\Framework\\v3.5;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\VCPackages;C:\\Program Files (x86)\\HTML Help Workshop;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin\\NETFX 4.0 Tools;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\windows\\corpam;C:\\python_26_amd64\\files;C:\\Windows\\ccmsetup;c:\\Program Files (x86)\\Microsoft SQL Server\\100\\Tools\\Binn\\;c:\\Program Files\\Microsoft SQL Server\\100\\Tools\\Binn\\;c:\\Program Files\\Microsoft SQL Server\\100\\DTS\\Binn\\;c:\\cygwin\\bin;C:\\apps\\;C:\\apps\\depot_tools;C:\\Program Files (x86)\\Windows Kits\\8.0\\Windows Performance Toolkit\\;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files (x86)\\Google\\Cert Installer;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Program Files (x86)\\Google\\google_appengine\\',
+    'PATHEXT': '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC',
+    'INCLUDE': 'c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\INCLUDE;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\include;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\INCLUDE;c:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v7.0A\\include;'})
+
+# Return the includes and such.
+print '['
+PrintListOfStrings(includes)
+print ']'
+
diff --git a/tools/gn/secondary/build/config/win/get_msvc_config_real.py b/tools/gn/secondary/build/config/win/get_msvc_config_real.py
new file mode 100644
index 0000000..a209d7f
--- /dev/null
+++ b/tools/gn/secondary/build/config/win/get_msvc_config_real.py
@@ -0,0 +1,575 @@
+# Copyright (c) 2013 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.
+
+# This file copies the logic from GYP to find the MSVC configuration. It's not
+# currently used because it is too slow. We will probably build this
+# functionality into the C++ code in the future.
+
+"""Handle version information related to Visual Stuio."""
+
+import errno
+import os
+import re
+import subprocess
+import sys
+
+class VisualStudioVersion(object):
+  """Information regarding a version of Visual Studio."""
+
+  def __init__(self, short_name, description,
+               solution_version, project_version, flat_sln, uses_vcxproj,
+               path, sdk_based, default_toolset=None):
+    self.short_name = short_name
+    self.description = description
+    self.solution_version = solution_version
+    self.project_version = project_version
+    self.flat_sln = flat_sln
+    self.uses_vcxproj = uses_vcxproj
+    self.path = path
+    self.sdk_based = sdk_based
+    self.default_toolset = default_toolset
+
+  def ShortName(self):
+    return self.short_name
+
+  def Description(self):
+    """Get the full description of the version."""
+    return self.description
+
+  def SolutionVersion(self):
+    """Get the version number of the sln files."""
+    return self.solution_version
+
+  def ProjectVersion(self):
+    """Get the version number of the vcproj or vcxproj files."""
+    return self.project_version
+
+  def FlatSolution(self):
+    return self.flat_sln
+
+  def UsesVcxproj(self):
+    """Returns true if this version uses a vcxproj file."""
+    return self.uses_vcxproj
+
+  def ProjectExtension(self):
+    """Returns the file extension for the project."""
+    return self.uses_vcxproj and '.vcxproj' or '.vcproj'
+
+  def Path(self):
+    """Returns the path to Visual Studio installation."""
+    return self.path
+
+  def ToolPath(self, tool):
+    """Returns the path to a given compiler tool. """
+    return os.path.normpath(os.path.join(self.path, "VC/bin", tool))
+
+  def DefaultToolset(self):
+    """Returns the msbuild toolset version that will be used in the absence
+    of a user override."""
+    return self.default_toolset
+
+  def SetupScript(self, target_arch):
+    """Returns a command (with arguments) to be used to set up the
+    environment."""
+    # Check if we are running in the SDK command line environment and use
+    # the setup script from the SDK if so. |target_arch| should be either
+    # 'x86' or 'x64'.
+    assert target_arch in ('x86', 'x64')
+    sdk_dir = os.environ.get('WindowsSDKDir')
+    if self.sdk_based and sdk_dir:
+      return [os.path.normpath(os.path.join(sdk_dir, 'Bin/SetEnv.Cmd')),
+              '/' + target_arch]
+    else:
+      # We don't use VC/vcvarsall.bat for x86 because vcvarsall calls
+      # vcvars32, which it can only find if VS??COMNTOOLS is set, which it
+      # isn't always.
+      if target_arch == 'x86':
+        return [os.path.normpath(
+          os.path.join(self.path, 'Common7/Tools/vsvars32.bat'))]
+      else:
+        assert target_arch == 'x64'
+        arg = 'x86_amd64'
+        if (os.environ.get('PROCESSOR_ARCHITECTURE') == 'AMD64' or
+            os.environ.get('PROCESSOR_ARCHITEW6432') == 'AMD64'):
+          # Use the 64-on-64 compiler if we can.
+          arg = 'amd64'
+        return [os.path.normpath(
+            os.path.join(self.path, 'VC/vcvarsall.bat')), arg]
+
+
+def _RegistryQueryBase(sysdir, key, value):
+  """Use reg.exe to read a particular key.
+
+  While ideally we might use the win32 module, we would like gyp to be
+  python neutral, so for instance cygwin python lacks this module.
+
+  Arguments:
+    sysdir: The system subdirectory to attempt to launch reg.exe from.
+    key: The registry key to read from.
+    value: The particular value to read.
+  Return:
+    stdout from reg.exe, or None for failure.
+  """
+  # Skip if not on Windows or Python Win32 setup issue
+  if sys.platform not in ('win32', 'cygwin'):
+    return None
+  # Setup params to pass to and attempt to launch reg.exe
+  cmd = [os.path.join(os.environ.get('WINDIR', ''), sysdir, 'reg.exe'),
+         'query', key]
+  if value:
+    cmd.extend(['/v', value])
+  p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  # Obtain the stdout from reg.exe, reading to the end so p.returncode is valid
+  # Note that the error text may be in [1] in some cases
+  text = p.communicate()[0]
+  # Check return code from reg.exe; officially 0==success and 1==error
+  if p.returncode:
+    return None
+  return text
+
+
+def _RegistryQuery(key, value=None):
+  """Use reg.exe to read a particular key through _RegistryQueryBase.
+
+  First tries to launch from %WinDir%\Sysnative to avoid WoW64 redirection. If
+  that fails, it falls back to System32.  Sysnative is available on Vista and
+  up and available on Windows Server 2003 and XP through KB patch 942589. Note
+  that Sysnative will always fail if using 64-bit python due to it being a
+  virtual directory and System32 will work correctly in the first place.
+
+  KB 942589 - http://support.microsoft.com/kb/942589/en-us.
+
+  Arguments:
+    key: The registry key.
+    value: The particular registry value to read (optional).
+  Return:
+    stdout from reg.exe, or None for failure.
+  """
+  text = None
+  try:
+    text = _RegistryQueryBase('Sysnative', key, value)
+  except OSError, e:
+    if e.errno == errno.ENOENT:
+      text = _RegistryQueryBase('System32', key, value)
+    else:
+      raise
+  return text
+
+
+def _RegistryGetValue(key, value):
+  """Use reg.exe to obtain the value of a registry key.
+
+  Args:
+    key: The registry key.
+    value: The particular registry value to read.
+  Return:
+    contents of the registry key's value, or None on failure.
+  """
+  text = _RegistryQuery(key, value)
+  if not text:
+    return None
+  # Extract value.
+  match = re.search(r'REG_\w+\s+([^\r]+)\r\n', text)
+  if not match:
+    return None
+  return match.group(1)
+
+
+def _RegistryKeyExists(key):
+  """Use reg.exe to see if a key exists.
+
+  Args:
+    key: The registry key to check.
+  Return:
+    True if the key exists
+  """
+  if not _RegistryQuery(key):
+    return False
+  return True
+
+
+def _CreateVersion(name, path, sdk_based=False):
+  """Sets up MSVS project generation.
+
+  Setup is based off the GYP_MSVS_VERSION environment variable or whatever is
+  autodetected if GYP_MSVS_VERSION is not explicitly specified. If a version is
+  passed in that doesn't match a value in versions python will throw a error.
+  """
+  if path:
+    path = os.path.normpath(path)
+  versions = {
+      '2013': VisualStudioVersion('2013',
+                                  'Visual Studio 2013',
+                                  solution_version='13.00',
+                                  project_version='4.0',
+                                  flat_sln=False,
+                                  uses_vcxproj=True,
+                                  path=path,
+                                  sdk_based=sdk_based,
+                                  default_toolset='v110'),
+      '2013e': VisualStudioVersion('2013e',
+                                   'Visual Studio 2013',
+                                   solution_version='13.00',
+                                   project_version='4.0',
+                                   flat_sln=True,
+                                   uses_vcxproj=True,
+                                   path=path,
+                                   sdk_based=sdk_based,
+                                   default_toolset='v110'),
+      '2012': VisualStudioVersion('2012',
+                                  'Visual Studio 2012',
+                                  solution_version='12.00',
+                                  project_version='4.0',
+                                  flat_sln=False,
+                                  uses_vcxproj=True,
+                                  path=path,
+                                  sdk_based=sdk_based,
+                                  default_toolset='v110'),
+      '2012e': VisualStudioVersion('2012e',
+                                   'Visual Studio 2012',
+                                   solution_version='12.00',
+                                   project_version='4.0',
+                                   flat_sln=True,
+                                   uses_vcxproj=True,
+                                   path=path,
+                                   sdk_based=sdk_based,
+                                   default_toolset='v110'),
+      '2010': VisualStudioVersion('2010',
+                                  'Visual Studio 2010',
+                                  solution_version='11.00',
+                                  project_version='4.0',
+                                  flat_sln=False,
+                                  uses_vcxproj=True,
+                                  path=path,
+                                  sdk_based=sdk_based),
+      '2010e': VisualStudioVersion('2010e',
+                                   'Visual Studio 2010',
+                                   solution_version='11.00',
+                                   project_version='4.0',
+                                   flat_sln=True,
+                                   uses_vcxproj=True,
+                                   path=path,
+                                   sdk_based=sdk_based),
+      '2008': VisualStudioVersion('2008',
+                                  'Visual Studio 2008',
+                                  solution_version='10.00',
+                                  project_version='9.00',
+                                  flat_sln=False,
+                                  uses_vcxproj=False,
+                                  path=path,
+                                  sdk_based=sdk_based),
+      '2008e': VisualStudioVersion('2008e',
+                                   'Visual Studio 2008',
+                                   solution_version='10.00',
+                                   project_version='9.00',
+                                   flat_sln=True,
+                                   uses_vcxproj=False,
+                                   path=path,
+                                   sdk_based=sdk_based),
+      '2005': VisualStudioVersion('2005',
+                                  'Visual Studio 2005',
+                                  solution_version='9.00',
+                                  project_version='8.00',
+                                  flat_sln=False,
+                                  uses_vcxproj=False,
+                                  path=path,
+                                  sdk_based=sdk_based),
+      '2005e': VisualStudioVersion('2005e',
+                                   'Visual Studio 2005',
+                                   solution_version='9.00',
+                                   project_version='8.00',
+                                   flat_sln=True,
+                                   uses_vcxproj=False,
+                                   path=path,
+                                   sdk_based=sdk_based),
+  }
+  return versions[str(name)]
+
+
+def _ConvertToCygpath(path):
+  """Convert to cygwin path if we are using cygwin."""
+  if sys.platform == 'cygwin':
+    p = subprocess.Popen(['cygpath', path], stdout=subprocess.PIPE)
+    path = p.communicate()[0].strip()
+  return path
+
+
+def _DetectVisualStudioVersions(versions_to_check, force_express):
+  """Collect the list of installed visual studio versions.
+
+  Returns:
+    A list of visual studio versions installed in descending order of
+    usage preference.
+    Base this on the registry and a quick check if devenv.exe exists.
+    Only versions 8-10 are considered.
+    Possibilities are:
+      2005(e) - Visual Studio 2005 (8)
+      2008(e) - Visual Studio 2008 (9)
+      2010(e) - Visual Studio 2010 (10)
+      2012(e) - Visual Studio 2012 (11)
+      2013(e) - Visual Studio 2013 (11)
+    Where (e) is e for express editions of MSVS and blank otherwise.
+  """
+  version_to_year = {
+      '8.0': '2005',
+      '9.0': '2008',
+      '10.0': '2010',
+      '11.0': '2012',
+      '12.0': '2013',
+  }
+  versions = []
+  for version in versions_to_check:
+    # Old method of searching for which VS version is installed
+    # We don't use the 2010-encouraged-way because we also want to get the
+    # path to the binaries, which it doesn't offer.
+    keys = [r'HKLM\Software\Microsoft\VisualStudio\%s' % version,
+            r'HKLM\Software\Wow6432Node\Microsoft\VisualStudio\%s' % version,
+            r'HKLM\Software\Microsoft\VCExpress\%s' % version,
+            r'HKLM\Software\Wow6432Node\Microsoft\VCExpress\%s' % version]
+    for index in range(len(keys)):
+      path = _RegistryGetValue(keys[index], 'InstallDir')
+      if not path:
+        continue
+      path = _ConvertToCygpath(path)
+      # Check for full.
+      full_path = os.path.join(path, 'devenv.exe')
+      express_path = os.path.join(path, 'vcexpress.exe')
+      if not force_express and os.path.exists(full_path):
+        # Add this one.
+        versions.append(_CreateVersion(version_to_year[version],
+            os.path.join(path, '..', '..')))
+      # Check for express.
+      elif os.path.exists(express_path):
+        # Add this one.
+        versions.append(_CreateVersion(version_to_year[version] + 'e',
+            os.path.join(path, '..', '..')))
+
+    # The old method above does not work when only SDK is installed.
+    keys = [r'HKLM\Software\Microsoft\VisualStudio\SxS\VC7',
+            r'HKLM\Software\Wow6432Node\Microsoft\VisualStudio\SxS\VC7']
+    for index in range(len(keys)):
+      path = _RegistryGetValue(keys[index], version)
+      if not path:
+        continue
+      path = _ConvertToCygpath(path)
+      versions.append(_CreateVersion(version_to_year[version] + 'e',
+          os.path.join(path, '..'), sdk_based=True))
+
+  return versions
+
+
+def SelectVisualStudioVersion(version='auto'):
+  """Select which version of Visual Studio projects to generate.
+
+  Arguments:
+    version: Hook to allow caller to force a particular version (vs auto).
+  Returns:
+    An object representing a visual studio project format version.
+  """
+  # In auto mode, check environment variable for override.
+  if version == 'auto':
+    version = os.environ.get('GYP_MSVS_VERSION', 'auto')
+  version_map = {
+    'auto': ('10.0', '9.0', '8.0', '11.0'),
+    '2005': ('8.0',),
+    '2005e': ('8.0',),
+    '2008': ('9.0',),
+    '2008e': ('9.0',),
+    '2010': ('10.0',),
+    '2010e': ('10.0',),
+    '2012': ('11.0',),
+    '2012e': ('11.0',),
+    '2013': ('12.0',),
+    '2013e': ('12.0',),
+  }
+  override_path = os.environ.get('GYP_MSVS_OVERRIDE_PATH')
+  if override_path:
+    msvs_version = os.environ.get('GYP_MSVS_VERSION')
+    if not msvs_version or 'e' not in msvs_version:
+      raise ValueError('GYP_MSVS_OVERRIDE_PATH requires GYP_MSVS_VERSION to be '
+                       'set to an "e" version (e.g. 2010e)')
+    return _CreateVersion(msvs_version, override_path, sdk_based=True)
+  version = str(version)
+  versions = _DetectVisualStudioVersions(version_map[version], 'e' in version)
+  if not versions:
+    if version == 'auto':
+      # Default to 2005 if we couldn't find anything
+      return _CreateVersion('2005', None)
+    else:
+      return _CreateVersion(version, None)
+  return versions[0]
+
+def GenerateEnvironmentFiles(toplevel_build_dir, generator_flags, open_out):
+  """It's not sufficient to have the absolute path to the compiler, linker,
+  etc. on Windows, as those tools rely on .dlls being in the PATH. We also
+  need to support both x86 and x64 compilers within the same build (to support
+  msvs_target_platform hackery). Different architectures require a different
+  compiler binary, and different supporting environment variables (INCLUDE,
+  LIB, LIBPATH). So, we extract the environment here, wrap all invocations
+  of compiler tools (cl, link, lib, rc, midl, etc.) via win_tool.py which
+  sets up the environment, and then we do not prefix the compiler with
+  an absolute path, instead preferring something like "cl.exe" in the rule
+  which will then run whichever the environment setup has put in the path.
+  When the following procedure to generate environment files does not
+  meet your requirement (e.g. for custom toolchains), you can pass
+  "-G ninja_use_custom_environment_files" to the gyp to suppress file
+  generation and use custom environment files prepared by yourself."""
+  archs = ('x86', 'x64')
+  if generator_flags.get('ninja_use_custom_environment_files', 0):
+    cl_paths = {}
+    for arch in archs:
+      cl_paths[arch] = 'cl.exe'
+    return cl_paths
+  vs = GetVSVersion(generator_flags)
+  cl_paths = {}
+  for arch in archs:
+    # Extract environment variables for subprocesses.
+    args = vs.SetupScript(arch)
+    args.extend(('&&', 'set'))
+    popen = subprocess.Popen(
+        args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    variables, _ = popen.communicate()
+    env = _ExtractImportantEnvironment(variables)
+    env_block = _FormatAsEnvironmentBlock(env)
+    f = open_out(os.path.join(toplevel_build_dir, 'environment.' + arch), 'wb')
+    f.write(env_block)
+    f.close()
+
+    # Find cl.exe location for this architecture.
+    args = vs.SetupScript(arch)
+    args.extend(('&&',
+      'for', '%i', 'in', '(cl.exe)', 'do', '@echo', 'LOC:%~$PATH:i'))
+    popen = subprocess.Popen(args, shell=True, stdout=subprocess.PIPE)
+    output, _ = popen.communicate()
+    cl_paths[arch] = _ExtractCLPath(output)
+  return cl_paths
+
+def OpenOutput(path, mode='w'):
+  """Open |path| for writing, creating directories if necessary."""
+  try:
+    os.makedirs(os.path.dirname(path))
+  except OSError:
+    pass
+  return open(path, mode)
+
+vs_version = None
+def GetVSVersion(generator_flags):
+  global vs_version
+  if not vs_version:
+    vs_version = SelectVisualStudioVersion(
+        generator_flags.get('msvs_version', 'auto'))
+  return vs_version
+
+def _ExtractImportantEnvironment(output_of_set):
+  """Extracts environment variables required for the toolchain to run from
+  a textual dump output by the cmd.exe 'set' command."""
+  envvars_to_save = (
+      'goma_.*', # TODO(scottmg): This is ugly, but needed for goma.
+      'include',
+      'lib',
+      'libpath',
+      'path',
+      'pathext',
+      'systemroot',
+      'temp',
+      'tmp',
+      )
+  env = {}
+  for line in output_of_set.splitlines():
+    for envvar in envvars_to_save:
+      if re.match(envvar + '=', line.lower()):
+        var, setting = line.split('=', 1)
+        if envvar == 'path':
+          # Our own rules (for running gyp-win-tool) and other actions in
+          # Chromium rely on python being in the path. Add the path to this
+          # python here so that if it's not in the path when ninja is run
+          # later, python will still be found.
+          setting = os.path.dirname(sys.executable) + os.pathsep + setting
+        env[var.upper()] = setting
+        break
+  for required in ('SYSTEMROOT', 'TEMP', 'TMP'):
+    if required not in env:
+      raise Exception('Environment variable "%s" '
+                      'required to be set to valid path' % required)
+  return env
+
+def _FormatAsEnvironmentBlock(envvar_dict):
+  """Format as an 'environment block' directly suitable for CreateProcess.
+  Briefly this is a list of key=value\0, terminated by an additional \0. See
+  CreateProcess documentation for more details."""
+  block = ''
+  nul = '\0'
+  for key, value in envvar_dict.iteritems():
+    block += key + '=' + value + nul
+  block += nul
+  return block
+
+
+def GenerateEnvironmentFiles(toplevel_build_dir, generator_flags):
+  """It's not sufficient to have the absolute path to the compiler, linker,
+  etc. on Windows, as those tools rely on .dlls being in the PATH. We also
+  need to support both x86 and x64 compilers within the same build (to support
+  msvs_target_platform hackery). Different architectures require a different
+  compiler binary, and different supporting environment variables (INCLUDE,
+  LIB, LIBPATH). So, we extract the environment here, wrap all invocations
+  of compiler tools (cl, link, lib, rc, midl, etc.) via win_tool.py which
+  sets up the environment, and then we do not prefix the compiler with
+  an absolute path, instead preferring something like "cl.exe" in the rule
+  which will then run whichever the environment setup has put in the path.
+  When the following procedure to generate environment files does not
+  meet your requirement (e.g. for custom toolchains), you can pass
+  "-G ninja_use_custom_environment_files" to the gyp to suppress file
+  generation and use custom environment files prepared by yourself."""
+  archs = ('x86', 'x64')
+  if generator_flags.get('ninja_use_custom_environment_files', 0):
+    cl_paths = {}
+    for arch in archs:
+      cl_paths[arch] = 'cl.exe'
+    return cl_paths
+  vs = GetVSVersion(generator_flags)
+  cl_paths = {}
+  for arch in archs:
+    # Extract environment variables for subprocesses.
+    args = vs.SetupScript(arch)
+    args.extend(('&&', 'set'))
+    popen = subprocess.Popen(
+        args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    variables, _ = popen.communicate()
+    env = _ExtractImportantEnvironment(variables)
+    env_block = _FormatAsEnvironmentBlock(env)
+    f = OpenOutput(os.path.join(toplevel_build_dir, 'environment.' + arch), 'wb')
+    f.write(env_block)
+    f.close()
+
+    # Find cl.exe location for this architecture.
+    args = vs.SetupScript(arch)
+    args.extend(('&&',
+      'for', '%i', 'in', '(cl.exe)', 'do', '@echo', 'LOC:%~$PATH:i'))
+    popen = subprocess.Popen(args, shell=True, stdout=subprocess.PIPE)
+    output, _ = popen.communicate()
+    cl_paths[arch] = _ExtractCLPath(output)
+  return cl_paths
+
+def _ExtractCLPath(output_of_where):
+  """Gets the path to cl.exe based on the output of calling the environment
+  setup batch file, followed by the equivalent of `where`."""
+  # Take the first line, as that's the first found in the PATH.
+  for line in output_of_where.strip().splitlines():
+    if line.startswith('LOC:'):
+      return line[len('LOC:'):].strip()
+
+#print SelectVisualStudioVersion().DefaultToolset()
+#GenerateEnvironmentFiles("D:\\src\\src1\\src\\out\\gn\\eraseme", {})
+#print '"', GetVSVersion({}).Path(), '"'
+print '"', GetVSVersion({}).sdk_based, '"'
+
+#-------------------------------------------------------------------------------
+
+version_info = {
+  '2010': {
+    'includes': [
+      'VC\\atlmfc\\include',
+    ],
+  },
+}