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# Copyright 2015 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.
declare_args() {
# Compile for Address Sanitizer to find memory bugs.
is_asan = false
# Compile for Leak Sanitizer to find leaks.
is_lsan = false
# Compile for Memory Sanitizer to find uninitialized reads.
is_msan = false
# Compile for Thread Sanitizer to find threading bugs.
is_tsan = false
# Compile for Undefined Behaviour Sanitizer to find various types of
# undefined behaviour (excludes vptr checks).
is_ubsan = false
# Compile for Undefined Behaviour Sanitizer's vptr checks.
is_ubsan_vptr = false
# Track where uninitialized memory originates from. From fastest to slowest:
# 0 - no tracking, 1 - track only the initial allocation site, 2 - track the
# chain of stores leading from allocation site to use site.
msan_track_origins = 2
# Use dynamic libraries instrumented by one of the sanitizers instead of the
# standard system libraries. Set this flag to download prebuilt binaries from
# GCS.
use_prebuilt_instrumented_libraries = false
# Enable building with SyzyAsan which can find certain types of memory
# errors. Only works on Windows. See
# https://github.com/google/syzygy/wiki/SyzyASanHowTo
is_syzyasan = false
# Compile with Control Flow Integrity to protect virtual calls and casts.
# See http://clang.llvm.org/docs/ControlFlowIntegrity.html
is_cfi = false
# By default, Control Flow Integrity will crash the program if it detects a
# violation. Set this to true to print detailed diagnostics instead.
use_cfi_diag = false
# Compile for fuzzing with LLVM LibFuzzer.
# See http://www.chromium.org/developers/testing/libfuzzer
use_libfuzzer = false
# Enables core ubsan security features. Will later be removed once it matches
# is_ubsan.
is_ubsan_security = false
# Compile for fuzzing with Dr. Fuzz
# See http://www.chromium.org/developers/testing/dr-fuzz
use_drfuzz = false
# Helper variable for testing builds with disabled libfuzzer.
# Not for client use.
disable_libfuzzer = false
}
# Args that are in turn dependent on other args must be in a separate
# declare_args block. User overrides are only applied at the end of a
# declare_args block.
declare_args() {
# Use libc++ (buildtools/third_party/libc++ and
# buildtools/third_party/libc++abi) instead of stdlibc++ as standard library.
# This is intended to be used for instrumented builds.
use_custom_libcxx = (is_asan && (is_linux || is_mac)) || is_tsan || is_msan ||
is_ubsan || use_libfuzzer
# Enable Link Time Optimization (output programs runs faster,
# but linking is up to 5-20x slower.
is_lto = is_cfi
use_sanitizer_coverage = use_libfuzzer
}
using_sanitizer =
is_asan || is_lsan || is_tsan || is_msan || is_ubsan || is_ubsan_vptr
assert(!using_sanitizer || is_clang,
"Sanitizers (is_*san) require setting is_clang = true in 'gn args'")
# MSan only links Chrome properly in release builds (brettw -- 9/1/2015). The
# same is possibly true for the other non-ASan sanitizers. But regardless of
# whether it links, one would normally never run a sanitizer in debug mode.
# Running in debug mode probably indicates you forgot to set the "is_debug =
# false" flag in the build args. ASan seems to run fine in debug mode.
#
# If you find a use-case where you want to compile a sanitizer in debug mode
# and have verified it works, ask brettw and we can consider removing it from
# this condition. We may also be able to find another way to enable your case
# without having people accidentally get broken builds by compiling an
# unsupported or unadvisable configurations.
#
# For one-off testing, just comment this assertion out.
assert(
!is_debug || !(is_msan || is_lsan || is_tsan || is_ubsan || is_ubsan_vptr),
"Sanitizers should generally be used in release (set is_debug=false).")
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