1819 lines
61 KiB
Plaintext
Executable File
1819 lines
61 KiB
Plaintext
Executable File
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import("//build/config/c++/c++.gni")
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import("//build/config/clang/clang.gni")
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import("//build/config/compiler/compiler.gni")
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import("//build/config/coverage/coverage.gni")
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import("//build/config/sanitizers/sanitizers.gni")
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import("//build/toolchain/cc_wrapper.gni")
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import("//build/toolchain/toolchain.gni")
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import("//build/misc/overrides/build.gni")
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if (current_cpu == "arm" || current_cpu == "arm64") {
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import("//build/config/arm.gni")
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}
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if (is_android) {
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import("//build_plugins/config/aosp/config.gni")
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}
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if (is_ohos) {
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import("//build/config/ohos/config.gni")
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}
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if (is_mac) {
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import("//build/config/mac/symbols.gni")
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}
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declare_args() {
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# Default to warnings as errors for default workflow, where we catch
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# warnings with known toolchains. Allow overriding this e.g. for Chromium
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# builds on Linux that could use a different version of the compiler.
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# With GCC, warnings in no-Chromium code are always not treated as errors.
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treat_warnings_as_errors = true
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# Whether to use the binary binutils checked into third_party/binutils.
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# These are not multi-arch so cannot be used except on x86 and x86-64 (the
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# only two architectures that are currently checked in). Turn this off when
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# you are using a custom toolchain and need to control -B in cflags.
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linux_use_bundled_binutils =
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linux_use_bundled_binutils_override && is_linux &&
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(current_cpu == "x64" || current_cpu == "x86")
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binutils_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin",
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root_build_dir)
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# Compile in such a way as to make it possible for the profiler to unwind full
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# stack frames. Setting this flag has a large effect on the performance of the
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# generated code than just setting profiling, but gives the profiler more
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# information to analyze.
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# Requires profiling to be set to true.
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enable_full_stack_frames_for_profiling = false
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# When we are going to use gold we need to find it.
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# This is initialized below, after use_gold might have been overridden.
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gold_path = false
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if (is_win) {
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# Whether the VS xtree header has been patched to disable warning 4702. If
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# it has, then we don't need to disable 4702 (unreachable code warning).
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# The patch is preapplied to the internal toolchain and hence all bots.
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msvs_xtree_patched = false
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}
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# Enable fatal linker warnings. Building Chromium with certain versions
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# of binutils can cause linker warning.
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# See: https://bugs.chromium.org/p/chromium/issues/detail?id=457359
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fatal_linker_warnings = true
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# Build with C++ RTTI enabled. Chromium builds without RTTI by default,
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# but some sanitizers are known to require it, like CFI diagnostics
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# and UBsan variants.
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use_rtti = use_cfi_diag || is_ubsan_vptr || is_ubsan_security
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# AFDO (Automatic Feedback Directed Optimizer) is a form of profile-guided
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# optimization that GCC supports. It used by ChromeOS in their official
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# builds. To use it, set auto_profile_path to the path to a file containing
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# the needed gcov profiling data.
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auto_profile_path = ""
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# Optimize symbol files for maximizing goma cache hit rate. This is on by
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# default when goma is enabled on Linux and Windows.
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# But setting this to true may make it harder to debug binaries on Linux.
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# See below reference for detail.
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strip_absolute_paths_from_debug_symbols = false
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# Allow projects that wish to stay on C++11 to override Chromium's default.
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use_cxx11 = false
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# Path to an AFDO profile to use while building with clang, if any. Empty
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# implies none.
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clang_sample_profile_path = ""
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# Some configurations have default sample profiles. If this is true and
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# clang_sample_profile_path is empty, we'll fall back to the default.
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#
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# We currently only have default profiles for Chromium in-tree, so we disable
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# this by default for all downstream projects, since these profiles are likely
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# nonsensical for said projects.
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clang_use_default_sample_profile =
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is_official_build && (is_ohos || is_android || is_desktop_linux)
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# Turn this on to have the compiler output extra timing information.
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compiler_timing = false
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# Set to true to pass --no-rosegment to lld. This is a workaround
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# for a KI issue in Valgrind,
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# https://bugs.kde.org/show_bug.cgi?id=384727
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ro_segment_workaround_for_valgrind = false
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# Turn this on to use ghash feature of lld for faster debug link on Windows.
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# http://blog.llvm.org/2018/01/improving-link-time-on-windows-with.html
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use_ghash = false
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# Whether to enable ThinLTO optimizations. Turning ThinLTO optimizations on
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# can substantially increase link time and binary size, but they generally
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# also make binaries a fair bit faster.
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thin_lto_enable_optimizations = is_chromeos
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# By default only the binaries in official builds get build IDs.
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force_local_build_id = true
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}
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declare_args() {
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use_cxx11_on_ohos = use_cxx11
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}
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declare_args() {
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# Set to true to use icf, Identical Code Folding.
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#
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# icf=all is broken in older golds, see
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# https://sourceware.org/bugzilla/show_bug.cgi?id=17704
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# See also https://crbug.com/663886
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# `linux_use_bundled_binutils` is to avoid breaking Linux destroys which may
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# still have a buggy gold.
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# chromeos binutils has been patched with the fix, so always use icf there.
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# The bug only affects x86 and x64, so we can still use ICF when targeting
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# other architectures.
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#
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# lld doesn't have the bug.
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use_icf = is_posix && !using_sanitizer && !use_clang_coverage &&
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!((is_ohos || is_android) && use_order_profiling) &&
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(use_lld ||
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(use_gold &&
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((!(is_ohos || is_android) && linux_use_bundled_binutils) ||
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is_chromeos || !(current_cpu == "x86" || current_cpu == "x64"))))
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}
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# Apply the default logic for these values if they were not set explicitly.
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if (gold_path == false) {
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if (use_gold) {
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gold_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin",
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root_build_dir)
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} else {
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gold_path = ""
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}
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}
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if (use_debug_fission == "default") {
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use_debug_fission = is_debug && !(is_ohos || is_android) && !is_win &&
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(use_gold || use_lld) && cc_wrapper == ""
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}
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# default_include_dirs ---------------------------------------------------------
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#
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# This is a separate config so that third_party code (which would not use the
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# source root and might have conflicting versions of some headers) can remove
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# this and specify their own include paths.
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config("default_include_dirs") {
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include_dirs = [
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"${root_out_dir}/override/third_party",
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"//",
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root_gen_dir,
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]
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}
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# compiler ---------------------------------------------------------------------
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#
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# Base compiler configuration.
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#
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# See also "runtime_library" below for related stuff and a discussion about
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# where stuff should go. Put warning related stuff in the "warnings" config.
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config("compiler") {
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asmflags = []
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cflags = []
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cflags_c = []
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cflags_cc = []
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cflags_objc = []
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cflags_objcc = []
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ldflags = []
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defines = []
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configs = []
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inputs = []
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# System-specific flags. If your compiler flags apply to one of the
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# categories here, add it to the associated file to keep this shared config
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# smaller.
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if (is_win) {
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configs += [ "//build/config/win:compiler" ]
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} else if (is_ohos) {
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configs += [ "//build/config/ohos:compiler" ]
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} else if (is_linux) {
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configs += [ "//build/config/linux:compiler" ]
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} else if (is_nacl) {
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configs += [ "//build/config/nacl:compiler" ]
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} else if (is_mac) {
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configs += [ "//build/config/mac:compiler" ]
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} else if (current_os == "aix") {
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configs += [ "//build/config/aix:compiler" ]
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} else if (is_mingw) {
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configs += [ "//build/config/mingw:compiler" ]
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} else if (is_android) {
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configs += [ "//build_plugins/config/aosp:compiler" ]
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} else if (is_ios) {
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configs += [ "//build_plugins/config/ios:compiler" ]
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}
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configs += [
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# See the definitions below.
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":compiler_cpu_abi",
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":compiler_codegen",
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]
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if (is_ohos && is_standard_system && is_clang &&
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(target_cpu == "arm" || target_cpu == "arm64")) {
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ldflags += [ "-Wl,--pack-dyn-relocs=android+relr" ]
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}
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# In general, Windows is totally different, but all the other builds share
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# some common GCC configuration.
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if (!is_win) {
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# Common POSIX compiler flags setup.
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# --------------------------------
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cflags += [ "-fno-strict-aliasing" ] # See http://crbug.com/32204
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configs += [ "//build/config/security:stack_protector_config" ]
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# Linker warnings.
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if (fatal_linker_warnings && !(is_chromeos && current_cpu == "arm") &&
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!(is_ohos && use_order_profiling) && !is_mac && current_os != "aix" &&
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!is_mingw && !is_ios) {
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ldflags += [ "-Wl,--fatal-warnings" ]
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}
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} else {
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cflags += [
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# Assume UTF-8 by default to avoid code page dependencies.
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"/utf-8",
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]
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if (is_clang) {
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# Don't look for includes in %INCLUDE%.
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cflags += [ "/X" ]
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}
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}
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# Eliminate build metadata (__DATE__, __TIME__ and __TIMESTAMP__) for
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# deterministic build. See https://crbug.com/314403
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if (!is_official_build) {
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if (is_win && !is_clang) {
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cflags += [
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"/wd4117", # Trying to define or undefine a predefined macro.
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"/D__DATE__=",
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"/D__TIME__=",
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"/D__TIMESTAMP__=",
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]
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} else {
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cflags += [
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"-Wno-builtin-macro-redefined",
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"-D__DATE__=",
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"-D__TIME__=",
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"-D__TIMESTAMP__=",
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]
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}
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}
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if (is_clang && is_debug) {
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# Allow comparing the address of references and 'this' against 0
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# in debug builds. Technically, these can never be null in
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# well-defined C/C++ and Clang can optimize such checks away in
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# release builds, but they may be used in asserts in debug builds.
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cflags_cc += [
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"-Wno-undefined-bool-conversion",
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"-Wno-tautological-undefined-compare",
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]
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}
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if (is_posix && !is_mac) {
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if (enable_profiling) {
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if (!is_debug) {
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cflags += [ "-g" ]
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if (enable_full_stack_frames_for_profiling) {
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cflags += [
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"-fno-inline",
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"-fno-optimize-sibling-calls",
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]
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}
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}
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}
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if (!is_mingw && !is_ios && (is_official_build || force_local_build_id)) {
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# Explicitly pass --build-id to ld. Compilers used to always pass this
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# implicitly but don't any more (in particular clang when built without
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# ENABLE_LINKER_BUILD_ID=ON). The crash infrastructure does need a build
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# id, so explicitly enable it in official builds. It's not needed in
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# unofficial builds and computing it does slow down the link, so go with
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# faster links in unofficial builds.
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ldflags += [ "-Wl,--build-id=md5" ]
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}
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if (!is_ohos && !is_ohos) {
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defines += [
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"_FILE_OFFSET_BITS=64",
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"_LARGEFILE_SOURCE",
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"_LARGEFILE64_SOURCE",
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]
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}
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if (!is_nacl) {
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cflags += [ "-funwind-tables" ]
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}
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}
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if (is_linux || is_android || is_ohos) {
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if (use_pic) {
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configs += [ "//build/config/security:pic_config" ]
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}
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if (!is_clang) {
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# Use pipes for communicating between sub-processes. Faster.
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# (This flag doesn't do anything with Clang.)
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cflags += [ "-pipe" ]
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}
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configs += [ "//build/config/security:-Wl-z_config" ]
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# Compiler instrumentation can introduce dependencies in DSOs to symbols in
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# the executable they are loaded into, so they are unresolved at link-time.
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if (is_ohos || (!using_sanitizer && !is_safestack)) {
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ldflags += [
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"-Wl,-z,defs",
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"-Wl,--as-needed",
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]
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}
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# Change default thread stack size to 2MB for asan.
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if (is_ohos && using_sanitizer) {
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ldflags += [ "-Wl,-z,stack-size=2097152" ]
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}
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}
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# Linux-specific compiler flags setup.
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# ------------------------------------
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if (is_android && is_clang) {
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_rebased_aosp_toolchain_root =
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rebase_path(aosp_toolchain_root, root_build_dir)
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# Let clang find the linker in the NDK.
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ldflags += [ "--gcc-toolchain=$_rebased_aosp_toolchain_root" ]
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}
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if ((is_posix && use_lld) || (target_os == "chromeos" && is_android) ||
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(is_ohos && use_lld)) {
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# NOTE: Some Chrome OS builds globally disable LLD, but they also build some
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# targets against ohos toolchains which should use LLD. Therefore we
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# explicitly select LLD in these cases.
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ldflags += [ "-fuse-ld=lld" ]
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if (current_cpu == "arm64") {
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# Reduce the page size from 65536 in order to reduce binary size slightly
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# by shrinking the alignment gap between segments. This also causes all
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# segments to be mapped adjacently, which breakpad relies on.
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ldflags += [ "-Wl,-z,max-page-size=4096" ]
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}
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} else if (use_gold) {
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ldflags += [ "-fuse-ld=gold" ]
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if (!(is_ohos || is_android)) {
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# On ohos, this isn't needed. gcc in the NDK knows to look next to
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# it with -fuse-ld=gold, and clang gets a --gcc-toolchain flag passed
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# above.
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ldflags += [ "-B$gold_path" ]
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if (linux_use_bundled_binutils) {
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ldflags += [
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# Experimentation found that using four linking threads
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# saved ~20% of link time.
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# Only apply this to the target linker, since the host
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# linker might not be gold, but isn't used much anyway.
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"-Wl,--threads",
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"-Wl,--thread-count=4",
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]
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}
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}
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} else if (linux_use_bundled_binutils) {
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# Gold is the default linker for the bundled binutils so we explicitly
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# enable the bfd linker when use_gold is not set.
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ldflags += [ "-fuse-ld=bfd" ]
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}
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if (use_icf) {
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ldflags += [ "-Wl,--icf=all" ]
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}
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if (linux_use_bundled_binutils) {
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cflags += [ "-B$binutils_path" ]
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}
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if (is_linux) {
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cflags += [ "-pthread" ]
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# Do not use the -pthread ldflag here since it becomes a no-op
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# when using -nodefaultlibs, which would cause an unused argument
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# error. "-lpthread" is added in //build/config:default_libs.
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}
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# Clang-specific compiler flags setup.
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# ------------------------------------
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if (is_clang) {
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cflags += [ "-fcolor-diagnostics" ]
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# Enable -fmerge-all-constants. This used to be the default in clang
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# for over a decade. It makes clang non-conforming, but is fairly safe
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# in practice and saves some binary size. We might want to consider
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# disabling this (https://bugs.llvm.org/show_bug.cgi?id=18538#c13),
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# but for now it looks like our build might rely on it
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# (https://crbug.com/829795).
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cflags += [ "-fmerge-all-constants" ]
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}
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if (use_lld) {
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if (is_win) {
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# On Windows, we call the linker directly, instead of calling it through
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# the driver.
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ldflags += [ "--color-diagnostics" ]
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} else {
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ldflags += [ "-Wl,--color-diagnostics" ]
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}
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}
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if (is_clang && !is_nacl && !use_xcode_clang) {
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cflags += [
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"-Xclang",
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"-mllvm",
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"-Xclang",
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"-instcombine-lower-dbg-declare=0",
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]
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}
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# Print absolute paths in diagnostics. There is no precedent for doing this
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# on Linux/Mac (GCC doesn't support it), but MSVC does this with /FC and
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# Windows developers rely on it (crbug.com/636109) so only do this on Windows.
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if (msvc_use_absolute_paths && is_clang && is_win) {
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cflags += [ "-fdiagnostics-absolute-paths" ]
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}
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# Makes builds independent of absolute file path.
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# Currently disabled for nacl since its toolchain lacks this flag (too old).
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if (symbol_level != 0 && is_clang && !is_nacl && !is_mac &&
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strip_absolute_paths_from_debug_symbols) {
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# If debug option is given, clang includes $cwd in debug info by default.
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# For such build, this flag generates reproducible obj files even we use
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# different build directory like "out/feature_a" and "out/feature_b" if
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# we build same files with same compile flag.
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# Other paths are already given in relative, no need to normalize them.
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cflags += [
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"-Xclang",
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"-fdebug-compilation-dir",
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"-Xclang",
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".",
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]
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if (is_win && use_lld) {
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if (symbol_level == 2 || (is_clang && using_sanitizer)) {
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# Absolutize source file path for PDB. Pass the real build directory
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# if the pdb contains source-level debug information.
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ldflags += [ "/PDBSourcePath:" + rebase_path(root_build_dir) ]
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} else {
|
|
# On Windows, (non-sanitizier) symbol_level 1 builds don't contain
|
|
# debug information in obj files; the linker just creates enough
|
|
# debug info at link time to produce symbolized stacks (without line
|
|
# numbers). In that case, there's no downside in using a fake fixed
|
|
# base directory for paths in the pdb. This makes the pdb output
|
|
# fully deterministic and independent of the build directory.
|
|
assert(symbol_level == 1 && !(is_clang && using_sanitizer))
|
|
ldflags += [ "/PDBSourcePath:o:\fake\prefix" ]
|
|
}
|
|
}
|
|
}
|
|
|
|
# Tells the compiler not to use absolute paths when passing the default
|
|
# paths to the tools it invokes. We don't want this because we don't
|
|
# really need it and it can mess up the goma cache entries.
|
|
if (is_clang && !is_nacl) {
|
|
cflags += [ "-no-canonical-prefixes" ]
|
|
}
|
|
|
|
# C11/C++11 compiler flags setup.
|
|
# ---------------------------
|
|
if (is_linux || is_ohos || is_android || (is_nacl && is_clang) ||
|
|
current_os == "aix") {
|
|
if (target_os == "ohos") {
|
|
cxx11_override = use_cxx11_on_ohos
|
|
} else {
|
|
cxx11_override = use_cxx11
|
|
}
|
|
|
|
if (is_clang) {
|
|
standard_prefix = "c"
|
|
|
|
# Since we build with -std=c* and not -std=gnu*, _GNU_SOURCE will not be
|
|
# defined by the compiler. However, lots of code relies on the
|
|
# non-standard features that _GNU_SOURCE enables, so define it manually.
|
|
defines += [ "_GNU_SOURCE" ]
|
|
|
|
if (is_nacl) {
|
|
# Undefine __STRICT_ANSI__ to get non-standard features which would
|
|
# otherwise not be enabled by NaCl's sysroots.
|
|
cflags += [ "-U__STRICT_ANSI__" ]
|
|
}
|
|
} else {
|
|
# Gcc does not support ##__VA_ARGS__ when in standards-conforming mode,
|
|
# but we use this feature in several places in Chromium.
|
|
standard_prefix = "gnu"
|
|
}
|
|
|
|
# cflags_c += [ "-std=${standard_prefix}11" ]
|
|
if (cxx11_override) {
|
|
# Override Chromium's default for projects that wish to stay on C++11.
|
|
cflags_cc += [ "-std=${standard_prefix}++11" ]
|
|
} else {
|
|
cflags_cc += [ "-std=${standard_prefix}++17" ]
|
|
}
|
|
} else if (!is_win && !is_nacl && !is_mingw) {
|
|
if (target_os == "ohos") {
|
|
cxx11_override = use_cxx11_on_ohos
|
|
} else {
|
|
cxx11_override = use_cxx11
|
|
}
|
|
|
|
if (cxx11_override) {
|
|
cflags_cc += [ "-std=c++11" ]
|
|
} else {
|
|
cflags_cc += [ "-std=c++17" ]
|
|
}
|
|
}
|
|
|
|
if (is_mac) {
|
|
# The system libc++ on Mac doesn't have aligned allocation in C++17.
|
|
defines += [ "_LIBCPP_HAS_NO_ALIGNED_ALLOCATION" ]
|
|
cflags_cc += [ "-stdlib=libc++" ]
|
|
ldflags += [ "-stdlib=libc++" ]
|
|
}
|
|
|
|
# Add flags for link-time optimization. These flags enable
|
|
# optimizations/transformations that require whole-program visibility at link
|
|
# time, so they need to be applied to all translation units, and we may end up
|
|
# with miscompiles if only part of the program is compiled with LTO flags. For
|
|
# that reason, we cannot allow targets to enable or disable these flags, for
|
|
# example by disabling the optimize configuration.
|
|
if (!is_debug && use_thin_lto &&
|
|
(current_toolchain == default_toolchain ||
|
|
((is_ohos || is_android) && defined(ohoa_secondary_abi_toolchain) &&
|
|
current_toolchain == ohos_secondary_abi_toolchain))) {
|
|
assert(use_lld || target_os == "chromeos",
|
|
"gold plugin only supported with ChromeOS")
|
|
|
|
cflags += [ "-flto=thin" ]
|
|
|
|
if (thin_lto_enable_optimizations) {
|
|
lto_opt_level = 2
|
|
} else {
|
|
lto_opt_level = 0
|
|
}
|
|
|
|
if (is_win) {
|
|
# This is a straight translation of the non-Windows flags below,
|
|
# except we do not use the ThinLTO cache, which leaks temporary
|
|
# files on Windows (https://crbug.com/871962).
|
|
ldflags += [
|
|
"/opt:lldlto=" + lto_opt_level,
|
|
"/opt:lldltojobs=8",
|
|
]
|
|
} else {
|
|
ldflags += [ "-flto=thin" ]
|
|
|
|
# Limit the parallelism to avoid too aggressive competition between
|
|
# linker jobs. This is still suboptimal to a potential dynamic
|
|
# resource allocation scheme, but should be good enough.
|
|
if (use_lld) {
|
|
# Limit the size of the ThinLTO cache to the lesser of 10% of available disk
|
|
# space, 10GB and 100000 files.
|
|
cache_policy =
|
|
"cache_size=10%:cache_size_bytes=10g:cache_size_files=100000"
|
|
ldflags += [
|
|
"-Wl,--thinlto-jobs=8",
|
|
"-Wl,--thinlto-cache-dir=" +
|
|
rebase_path("$root_out_dir/thinlto-cache", root_build_dir),
|
|
"-Wl,--thinlto-cache-policy,$cache_policy",
|
|
]
|
|
} else {
|
|
ldflags += [ "-Wl,-plugin-opt,jobs=8" ]
|
|
}
|
|
|
|
if (use_lld) {
|
|
ldflags += [ "-Wl,--lto-O" + lto_opt_level ]
|
|
if (thin_lto_enable_optimizations) {
|
|
if (is_ohos || is_android) {
|
|
ldflags += [
|
|
"-Wl,-mllvm",
|
|
"-Wl,-import-instr-limit=5",
|
|
]
|
|
}
|
|
}
|
|
} else {
|
|
not_needed([ "lto_opt_level" ])
|
|
}
|
|
}
|
|
|
|
if (!(is_ohos || is_android)) {
|
|
cflags += [ "-fwhole-program-vtables" ]
|
|
if (!is_win) {
|
|
ldflags += [ "-fwhole-program-vtables" ]
|
|
}
|
|
}
|
|
|
|
# Work-around for http://openradar.appspot.com/20356002
|
|
if (is_mac) {
|
|
ldflags += [ "-Wl,-all_load" ]
|
|
}
|
|
|
|
# This flag causes LTO to create an .ARM.attributes section with the correct
|
|
# architecture. This is necessary because LLD will refuse to link a program
|
|
# unless the architecture revision in .ARM.attributes is sufficiently new.
|
|
if (current_cpu == "arm") {
|
|
ldflags += [ "-march=$arm_arch" ]
|
|
}
|
|
}
|
|
|
|
if (compiler_timing) {
|
|
if (is_clang) {
|
|
if (is_win) {
|
|
cflags += [ "-Xclang" ]
|
|
}
|
|
cflags += [ "-ftime-report" ]
|
|
} else if (is_win) {
|
|
cflags += [
|
|
# "Documented" here:
|
|
# http://aras-p.info/blog/2017/10/23/Best-unknown-MSVC-flag-d2cgsummary/
|
|
"/d2cgsummary",
|
|
]
|
|
}
|
|
}
|
|
|
|
# Pass flag to LLD to work around issue in Valgrind related to
|
|
# location of debug symbols.
|
|
if (use_lld && ro_segment_workaround_for_valgrind) {
|
|
ldflags += [ "-Wl,--no-rosegment" ]
|
|
}
|
|
|
|
# This flag enforces that member pointer base types are complete. It helps
|
|
# prevent us from running into problems in the Microsoft C++ ABI (see
|
|
# https://crbug.com/847724).
|
|
if (is_clang && !is_nacl && target_os != "chromeos" && !use_xcode_clang &&
|
|
(is_win || use_custom_libcxx)) {
|
|
cflags += [ "-fcomplete-member-pointers" ]
|
|
}
|
|
|
|
# Pass the same C/C++ flags to the objective C/C++ compiler.
|
|
cflags_objc += cflags_c
|
|
cflags_objcc += cflags_cc
|
|
|
|
# Assign any flags set for the C compiler to asmflags so that they are sent
|
|
# to the assembler. The Windows assembler takes different types of flags
|
|
# so only do so for posix platforms.
|
|
if (is_posix) {
|
|
asmflags += cflags
|
|
asmflags += cflags_c
|
|
}
|
|
}
|
|
|
|
# This provides the basic options to select the target CPU and ABI.
|
|
# It is factored out of "compiler" so that special cases can use this
|
|
# without using everything that "compiler" brings in. Options that
|
|
# tweak code generation for a particular CPU do not belong here!
|
|
# See "compiler_codegen", below.
|
|
config("compiler_cpu_abi") {
|
|
cflags = []
|
|
ldflags = []
|
|
defines = []
|
|
|
|
if (is_posix && !is_mac && !is_ios) {
|
|
# CPU architecture. We may or may not be doing a cross compile now, so for
|
|
# simplicity we always explicitly set the architecture.
|
|
if (current_cpu == "x64") {
|
|
cflags += [
|
|
"-m64",
|
|
"-march=x86-64",
|
|
]
|
|
ldflags += [ "-m64" ]
|
|
} else if (current_cpu == "x86") {
|
|
cflags += [ "-m32" ]
|
|
ldflags += [ "-m32" ]
|
|
if (!is_nacl) {
|
|
cflags += [
|
|
"-msse2",
|
|
"-mfpmath=sse",
|
|
"-mmmx",
|
|
]
|
|
}
|
|
} else if (current_cpu == "arm") {
|
|
if (is_clang && !is_android && !is_ohos && !is_nacl) {
|
|
cflags += [ "--target=arm-linux-gnueabihf" ]
|
|
ldflags += [ "--target=arm-linux-gnueabihf" ]
|
|
}
|
|
if (!is_nacl) {
|
|
cflags += [
|
|
"-march=$arm_arch",
|
|
"-mfloat-abi=$arm_float_abi",
|
|
]
|
|
}
|
|
if (arm_tune != "") {
|
|
cflags += [ "-mtune=$arm_tune" ]
|
|
}
|
|
} else if (current_cpu == "arm64") {
|
|
if (is_clang && !is_android && !is_ohos && !is_nacl) {
|
|
cflags += [ "--target=aarch64-linux-gnu" ]
|
|
ldflags += [ "--target=aarch64-linux-gnu" ]
|
|
}
|
|
if (is_clang && (is_android || is_ohos)) {
|
|
ldflags += [ "-Wl,--hash-style=gnu" ]
|
|
}
|
|
if (!is_android) {
|
|
cflags += [
|
|
"-march=$arm_arch",
|
|
"-mfloat-abi=$arm_float_abi",
|
|
"-mfpu=$arm_fpu",
|
|
]
|
|
}
|
|
ldflags += [ "-march=$arm_arch" ]
|
|
}
|
|
}
|
|
|
|
asmflags = cflags
|
|
if (current_cpu == "arm64") {
|
|
asmflags += [ "-march=armv8.2-a+dotprod+fp16" ]
|
|
}
|
|
}
|
|
|
|
# This provides options to tweak code generation that are necessary
|
|
# for particular Chromium code or for working around particular
|
|
# compiler bugs (or the combination of the two).
|
|
config("compiler_codegen") {
|
|
configs = []
|
|
cflags = []
|
|
|
|
if (is_nacl) {
|
|
configs += [ "//build/config/nacl:compiler_codegen" ]
|
|
} else if (is_posix && !is_mac) {
|
|
if (current_cpu == "x86") {
|
|
if (is_clang) {
|
|
cflags += [ "-momit-leaf-frame-pointer" ]
|
|
}
|
|
} else if (current_cpu == "arm") {
|
|
if ((is_ohos || is_android) && !is_clang) {
|
|
# Clang doesn't support these flags.
|
|
cflags += [
|
|
"-fno-tree-sra",
|
|
"-fno-caller-saves",
|
|
]
|
|
}
|
|
}
|
|
}
|
|
|
|
asmflags = cflags
|
|
}
|
|
|
|
config("compiler_arm_fpu") {
|
|
if (current_cpu == "arm" && !is_nacl) {
|
|
cflags = [ "-mfpu=$arm_fpu" ]
|
|
asmflags = cflags
|
|
}
|
|
}
|
|
|
|
config("compiler_arm_thumb") {
|
|
if (current_cpu == "arm" && arm_use_thumb && is_posix &&
|
|
!(is_mac || is_nacl)) {
|
|
cflags = [ "-mthumb" ]
|
|
if ((is_ohos || is_android) && !is_clang) {
|
|
# Clang doesn't support this option.
|
|
cflags += [ "-mthumb-interwork" ]
|
|
}
|
|
}
|
|
}
|
|
|
|
config("compiler_arm") {
|
|
if (current_cpu == "arm" && is_chromeos) {
|
|
# arm is normally the default mode for clang, but on chromeos a wrapper
|
|
# is used to pass -mthumb, and therefore change the default.
|
|
cflags = [ "-marm" ]
|
|
}
|
|
}
|
|
|
|
# runtime_library -------------------------------------------------------------
|
|
#
|
|
# Sets the runtime library and associated options.
|
|
#
|
|
# How do you determine what should go in here vs. "compiler" above? Consider if
|
|
# a target might choose to use a different runtime library (ignore for a moment
|
|
# if this is possible or reasonable on your system). If such a target would want
|
|
# to change or remove your option, put it in the runtime_library config. If a
|
|
# target wants the option regardless, put it in the compiler config.
|
|
|
|
config("runtime_library") {
|
|
defines = []
|
|
configs = []
|
|
|
|
# The order of this config is important: it must appear before
|
|
# ohos:runtime_library.
|
|
if (is_posix) {
|
|
configs += [ "//build/config/posix:runtime_library" ]
|
|
}
|
|
|
|
# System-specific flags. If your compiler flags apply to one of the
|
|
# categories here, add it to the associated file to keep this shared config
|
|
# smaller.
|
|
if (is_win) {
|
|
configs += [ "//build/config/win:runtime_library" ]
|
|
} else if (is_linux) {
|
|
configs += [ "//build/config/linux:runtime_library" ]
|
|
} else if (is_mac) {
|
|
configs += [ "//build/config/mac:runtime_library" ]
|
|
} else if (is_ohos) {
|
|
configs += [ "//build/config/ohos:runtime_library" ]
|
|
} else if (is_android) {
|
|
configs += [ "//build_plugins/config/aosp:runtime_library" ]
|
|
} else if (is_ios) {
|
|
configs += [ "//build_plugins/config/ios:runtime_library" ]
|
|
}
|
|
|
|
if (is_component_build) {
|
|
defines += [ "COMPONENT_BUILD" ]
|
|
}
|
|
}
|
|
|
|
# default_warnings ------------------------------------------------------------
|
|
#
|
|
# Collects all warning flags that are used by default. This is used as a
|
|
# subconfig of both chromium_code and no_chromium_code. This way these
|
|
# flags are guaranteed to appear on the compile command line after -Wall.
|
|
config("default_warnings") {
|
|
cflags = []
|
|
cflags_cc = []
|
|
ldflags = []
|
|
|
|
if (is_mac && !is_nacl) {
|
|
# When compiling Objective-C, warns if a method is used whose
|
|
# availability is newer than the deployment target.
|
|
cflags += [ "-Wunguarded-availability" ]
|
|
}
|
|
|
|
# Suppress warnings about ABI changes on ARM (Clang doesn't give this
|
|
# warning).
|
|
if (current_cpu == "arm" && !is_clang) {
|
|
cflags += [ "-Wno-psabi" ]
|
|
}
|
|
|
|
if (!is_clang) {
|
|
cflags_cc += [
|
|
# See comment for -Wno-c++11-narrowing.
|
|
"-Wno-narrowing",
|
|
]
|
|
|
|
# -Wunused-local-typedefs is broken in gcc,
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63872
|
|
cflags += [ "-Wno-unused-local-typedefs" ]
|
|
|
|
# Don't warn about "maybe" uninitialized. Clang doesn't include this
|
|
# in -Wall but gcc does, and it gives false positives.
|
|
cflags += [ "-Wno-maybe-uninitialized" ]
|
|
cflags += [ "-Wno-deprecated-declarations" ]
|
|
|
|
# GCC assumes 'this' is never nullptr and optimizes away code
|
|
# like "if (this == nullptr) ...": [1]. However, some Chromium
|
|
# code relies on these types of null pointer checks [2], so
|
|
# disable this optimization.
|
|
# [1] https://gcc.gnu.org/gcc-6/porting_to.html#this-cannot-be-null
|
|
# [2] https://crbug.com/784492#c13
|
|
cflags += [ "-fno-delete-null-pointer-checks" ]
|
|
|
|
# -Wcomment gives too many false positives in the case a
|
|
# backslash ended comment line is followed by a new line of
|
|
# comments
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61638
|
|
cflags += [ "-Wno-comments" ]
|
|
}
|
|
|
|
# Common Clang and GCC warning setup.
|
|
if (!is_win || is_clang) {
|
|
cflags += [
|
|
# Disables.
|
|
"-Wno-missing-field-initializers", # "struct foo f = {0};"
|
|
"-Wno-unused-parameter", # Unused function parameters.
|
|
]
|
|
}
|
|
|
|
if (is_mingw) {
|
|
cflags += [
|
|
"-Wno-error=c99-designator",
|
|
"-Wno-error=anon-enum-enum-conversion",
|
|
"-Wno-error=implicit-fallthrough",
|
|
"-Wno-error=sizeof-array-div",
|
|
"-Wno-error=reorder-init-list",
|
|
"-Wno-error=range-loop-construct",
|
|
"-Wno-error=deprecated-copy",
|
|
"-Wno-error=implicit-int-float-conversion",
|
|
"-Wno-error=inconsistent-dllimport",
|
|
"-Wno-error=unknown-warning-option",
|
|
"-Wno-error=abstract-final-class",
|
|
"-Wno-error=sign-compare",
|
|
]
|
|
}
|
|
|
|
if (is_clang) {
|
|
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",
|
|
"-Wno-unneeded-internal-declaration",
|
|
]
|
|
if (build_cross_platform_version) {
|
|
cflags += [
|
|
"-Wno-error=implicit-int-float-conversion",
|
|
"-Wno-error=implicit-fallthrough",
|
|
"-Wno-error=sign-compare",
|
|
"-Wno-error=c99-designator",
|
|
"-Wno-error=anon-enum-enum-conversion",
|
|
"-Wno-error=sizeof-array-div",
|
|
"-Wno-error=deprecated-copy",
|
|
"-Wno-error=return-stack-address",
|
|
"-Wno-error=reserved-identifier",
|
|
"-Wno-error=suggest-destructor-override",
|
|
"-Wno-error=suggest-override",
|
|
"-Wno-error=unused-but-set-variable",
|
|
"-Wno-error=unused-but-set-parameter",
|
|
"-Wno-error=option-ignored",
|
|
"-mno-outline-atomics",
|
|
"-Wno-deprecated-declarations",
|
|
]
|
|
}
|
|
if (use_musl) {
|
|
cflags += [
|
|
"-Wno-error=c99-designator",
|
|
"-Wno-error=anon-enum-enum-conversion",
|
|
"-Wno-error=implicit-fallthrough",
|
|
"-Wno-error=sizeof-array-div",
|
|
"-Wno-error=reorder-init-list",
|
|
"-Wno-error=range-loop-construct",
|
|
"-Wno-error=deprecated-copy",
|
|
"-Wno-error=implicit-int-float-conversion",
|
|
"-Wno-error=inconsistent-dllimport",
|
|
"-Wno-error=unknown-warning-option",
|
|
"-Wno-error=abstract-final-class",
|
|
"-Wno-error=sign-compare",
|
|
"-Wno-error=int-in-bool-context",
|
|
"-Wno-error=xor-used-as-pow",
|
|
"-Wno-error=return-stack-address",
|
|
"-Wno-error=dangling-gsl",
|
|
"-Wno-unused-but-set-variable",
|
|
"-Wno-deprecated-declarations",
|
|
"-Wno-unused-but-set-parameter",
|
|
"-Wno-null-pointer-subtraction",
|
|
"-Wno-unqualified-std-cast-call",
|
|
]
|
|
}
|
|
|
|
# use_xcode_clang only refers to the iOS toolchain, host binaries use
|
|
# chromium's clang always.
|
|
if (!is_nacl) {
|
|
cflags += [ "-Wno-undefined-var-template" ]
|
|
if (current_toolchain == host_toolchain || !use_xcode_clang ||
|
|
xcode_version_int >= 930) {
|
|
cflags += [
|
|
"-Wno-nonportable-include-path",
|
|
"-Wno-user-defined-warnings",
|
|
"-Wno-unused-lambda-capture",
|
|
]
|
|
}
|
|
if (current_toolchain == host_toolchain || !use_xcode_clang ||
|
|
xcode_version_int >= 1000) {
|
|
cflags += [ "-Wno-null-pointer-arithmetic" ]
|
|
}
|
|
if (current_toolchain == host_toolchain || !use_xcode_clang) {
|
|
# Flags NaCl (Clang 3.7) and Xcode 9.2 (Clang clang-900.0.39.2) do not
|
|
# recognize.
|
|
cflags += [ "-Wno-enum-compare-switch" ]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
# 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.
|
|
|
|
if (is_clang) {
|
|
# Opt in to additional [[nodiscard]] on standard library methods.
|
|
defines = [ "_HAS_NODISCARD" ]
|
|
}
|
|
} else {
|
|
cflags = [ "-Wall" ]
|
|
if (treat_warnings_as_errors && !build_cross_platform_version) {
|
|
cflags += [ "-Werror" ]
|
|
|
|
# The compiler driver can sometimes (rarely) emit warnings before calling
|
|
# the actual linker. Make sure these warnings are treated as errors as
|
|
# well.
|
|
ldflags = [ "-Werror" ]
|
|
}
|
|
if (is_clang) {
|
|
# Enable extra warnings for chromium_code when we control the compiler.
|
|
cflags += [ "-Wextra" ]
|
|
}
|
|
|
|
# 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",
|
|
]
|
|
|
|
if (!is_debug && !using_sanitizer &&
|
|
(!is_linux || !is_clang || is_official_build)) {
|
|
# _FORTIFY_SOURCE isn't really supported by Clang now, see
|
|
# http://llvm.org/bugs/show_bug.cgi?id=16821.
|
|
# It seems to work fine with Ubuntu 12 headers though, so use it in
|
|
# official builds.
|
|
#
|
|
# 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.
|
|
#
|
|
# Need to support fortify ability first in musl libc, so disable the option temporarily
|
|
# defines += [ "_FORTIFY_SOURCE=2" ]
|
|
}
|
|
|
|
if (is_mac) {
|
|
cflags_objc = [ "-Wobjc-missing-property-synthesis" ]
|
|
cflags_objcc = [ "-Wobjc-missing-property-synthesis" ]
|
|
}
|
|
}
|
|
|
|
if (is_clang) {
|
|
cflags += [
|
|
# Warn on missing break statements at the end of switch cases.
|
|
# For intentional fallthrough, use FALLTHROUGH; from
|
|
# base/compiler_specific.h
|
|
"-Wimplicit-fallthrough",
|
|
|
|
# Thread safety analysis. See base/thread_annotations.h and
|
|
# https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
|
|
"-Wthread-safety",
|
|
]
|
|
}
|
|
|
|
configs = [ ":default_warnings" ]
|
|
}
|
|
|
|
config("no_chromium_code") {
|
|
cflags = []
|
|
cflags_cc = []
|
|
defines = []
|
|
|
|
if (is_win) {
|
|
cflags += [
|
|
"/W3", # Warning level 3.
|
|
"/wd4800", # Disable warning when forcing value to bool.
|
|
"/wd4267", # size_t to int.
|
|
"/wd4996", # Deprecated function warning.
|
|
]
|
|
defines += [
|
|
"_CRT_NONSTDC_NO_WARNINGS",
|
|
"_CRT_NONSTDC_NO_DEPRECATE",
|
|
]
|
|
} else {
|
|
# GCC may emit unsuppressible warnings so don't add -Werror for no chromium
|
|
# code. crbug.com/589724
|
|
if (treat_warnings_as_errors && is_clang) {
|
|
cflags += [ "-Werror" ]
|
|
ldflags = [ "-Werror" ]
|
|
}
|
|
if (is_clang && !is_nacl) {
|
|
cflags += [ "-Wall" ]
|
|
}
|
|
}
|
|
|
|
if (is_clang) {
|
|
cflags += [
|
|
# Lots of third-party libraries have unused variables. Instead of
|
|
# suppressing them individually, we just blanket suppress them here.
|
|
"-Wno-unused-variable",
|
|
]
|
|
}
|
|
|
|
configs = [ ":default_warnings" ]
|
|
}
|
|
|
|
# noshadowing -----------------------------------------------------------------
|
|
#
|
|
# Allows turning -Wshadow on.
|
|
|
|
config("noshadowing") {
|
|
# This flag has to be disabled for nacl because the nacl compiler is too
|
|
# strict about shadowing.
|
|
if (is_clang && !is_nacl) {
|
|
cflags = [ "-Wshadow" ]
|
|
}
|
|
}
|
|
|
|
# rtti ------------------------------------------------------------------------
|
|
#
|
|
# Allows turning Run-Time Type Identification on or off.
|
|
|
|
config("rtti") {
|
|
if (is_win) {
|
|
cflags_cc = [ "/GR" ]
|
|
} else {
|
|
cflags_cc = [ "-frtti" ]
|
|
}
|
|
}
|
|
|
|
config("no_rtti") {
|
|
# Some sanitizer configs may require RTTI to be left enabled globally
|
|
if (!use_rtti) {
|
|
if (is_win) {
|
|
cflags_cc = [ "/GR-" ]
|
|
} else {
|
|
cflags_cc = [ "-fno-rtti" ]
|
|
cflags_objcc = cflags_cc
|
|
}
|
|
}
|
|
}
|
|
|
|
# export_dynamic ---------------------------------------------------------------
|
|
#
|
|
# Ensures all exported symbols are added to the dynamic symbol table. This is
|
|
# necessary to expose Chrome's custom operator new() and operator delete() (and
|
|
# other memory-related symbols) to libraries. Otherwise, they might
|
|
# (de)allocate memory on a different heap, which would spell trouble if pointers
|
|
# to heap-allocated memory are passed over shared library boundaries.
|
|
config("export_dynamic") {
|
|
if (is_desktop_linux || export_libcxxabi_from_executables) {
|
|
ldflags = [ "-rdynamic" ]
|
|
}
|
|
}
|
|
|
|
# thin_archive -----------------------------------------------------------------
|
|
#
|
|
# Enables thin archives on posix. Regular archives directly include the object
|
|
# files used to generate it. Thin archives merely reference the object files.
|
|
# This makes building them faster since it requires less disk IO, but is
|
|
# inappropriate if you wish to redistribute your static library.
|
|
# This config is added to the global config, so thin archives should already be
|
|
# enabled. If you want to make a distributable static library, you need to do 2
|
|
# things:
|
|
# 1. Set complete_static_lib so that all dependencies of the library make it
|
|
# into the library. See `gn help complete_static_lib` for details.
|
|
# 2. Remove the thin_archive config, so that the .a file actually contains all
|
|
# .o files, instead of just references to .o files in the build directory
|
|
config("thin_archive") {
|
|
# Mac and iOS use the mac-specific "libtool" command, not ar, which doesn't
|
|
# have a "thin archive" mode (it does accept -T, but it means truncating
|
|
# archive names to 16 characters, which is not what we want).
|
|
if (is_posix && !is_nacl && !is_mac) {
|
|
arflags = [ "-T" ]
|
|
}
|
|
}
|
|
|
|
# exceptions -------------------------------------------------------------------
|
|
#
|
|
# Allows turning Exceptions on or off.
|
|
|
|
config("exceptions") {
|
|
if (is_win) {
|
|
# Enables exceptions in the STL.
|
|
if (!use_custom_libcxx) {
|
|
defines = [ "_HAS_EXCEPTIONS=1" ]
|
|
}
|
|
cflags_cc = [ "/EHsc" ]
|
|
} else {
|
|
cflags_cc = [ "-fexceptions" ]
|
|
cflags_objcc = cflags_cc
|
|
}
|
|
}
|
|
|
|
config("no_exceptions") {
|
|
if (is_win) {
|
|
# Disables exceptions in the STL.
|
|
# libc++ uses the __has_feature macro to control whether to use exceptions,
|
|
# so defining this macro is unnecessary. Defining _HAS_EXCEPTIONS to 0 also
|
|
# breaks libc++ because it depends on MSVC headers that only provide certain
|
|
# declarations if _HAS_EXCEPTIONS is 1. Those MSVC headers do not use
|
|
# exceptions, despite being conditional on _HAS_EXCEPTIONS.
|
|
if (!use_custom_libcxx) {
|
|
defines = [ "_HAS_EXCEPTIONS=0" ]
|
|
}
|
|
} else {
|
|
cflags_cc = [ "-fno-exceptions" ]
|
|
cflags_objcc = cflags_cc
|
|
}
|
|
}
|
|
|
|
# Warnings ---------------------------------------------------------------------
|
|
|
|
# This will generate warnings when using Clang if code generates exit-time
|
|
# destructors, which will slow down closing the program.
|
|
config("wexit_time_destructors") {
|
|
if (is_clang) {
|
|
cflags = [ "-Wexit-time-destructors" ]
|
|
}
|
|
}
|
|
|
|
# On Windows compiling on x64, VC will issue a warning when converting
|
|
# size_t to int because it will truncate the value. Our code should not have
|
|
# these warnings and one should use a static_cast or a checked_cast for the
|
|
# conversion depending on the case. However, a lot of code still needs to be
|
|
# fixed. Apply this config to such targets to disable the warning.
|
|
#
|
|
# Note that this can be applied regardless of platform and architecture to
|
|
# clean up the call sites. This will only apply the flag when necessary.
|
|
#
|
|
# This config is just an alias to no_shorten_64_warnings and will
|
|
# suppress a superset of warning 4267 and any 64-bit -> 32-bit implicit
|
|
# conversions. Having both for a time means not having to go through and
|
|
# update all references to no_size_t_to_int_warning throughout the codebase
|
|
# atomically.
|
|
#
|
|
# Any new warning suppressions should use the no_shorten_64_warnings
|
|
# config below and not this.
|
|
config("no_size_t_to_int_warning") {
|
|
configs = [ ":no_shorten_64_warnings" ]
|
|
}
|
|
|
|
# As part of re-enabling -Wconversion (see issue 588506) some code
|
|
# will continue to generate warnings.
|
|
# The first warning to be enabled will be -Wshorten-64-to-32.
|
|
#
|
|
# Code that currently generates warnings for this can include this
|
|
# config to disable them.
|
|
config("no_shorten_64_warnings") {
|
|
if (current_cpu == "x64" || current_cpu == "arm64") {
|
|
if (is_clang) {
|
|
cflags = [ "-Wno-shorten-64-to-32" ]
|
|
} else {
|
|
if (is_win) {
|
|
# MSVC does not have an explicit warning equivalent to
|
|
# -Wshorten-64-to-32 but 4267 warns for size_t -> int
|
|
# on 64-bit builds, so is the closest.
|
|
cflags = [ "/wd4267" ]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
# Some code presumes that pointers to structures/objects are compatible
|
|
# regardless of whether what they point to is already known to be valid.
|
|
# gcc 4.9 and earlier had no way of suppressing this warning without
|
|
# suppressing the rest of them. Here we centralize the identification of
|
|
# the gcc 4.9 toolchains.
|
|
config("no_incompatible_pointer_warnings") {
|
|
cflags = []
|
|
if (is_clang) {
|
|
cflags += [ "-Wno-incompatible-pointer-types" ]
|
|
} else if (is_chromeos && current_cpu == "arm") {
|
|
cflags += [ "-w" ]
|
|
}
|
|
}
|
|
|
|
# Optimization -----------------------------------------------------------------
|
|
#
|
|
# The BUILDCONFIG file sets the "default_optimization" config on targets by
|
|
# default. It will be equivalent to either "optimize" (release) or
|
|
# "no_optimize" (debug) optimization configs.
|
|
#
|
|
# You can override the optimization level on a per-target basis by removing the
|
|
# default config and then adding the named one you want:
|
|
#
|
|
# configs -= [ "//build/config/compiler:default_optimization" ]
|
|
# configs += [ "//build/config/compiler:optimize_max" ]
|
|
|
|
# Shared settings for both "optimize" and "optimize_max" configs.
|
|
# IMPORTANT: On Windows "/O1" and "/O2" must go before the common flags.
|
|
if (is_win) {
|
|
common_optimize_on_cflags = [
|
|
"/Ob2", # Both explicit and auto inlining.
|
|
"/Oy-", # Disable omitting frame pointers, must be after /O2.
|
|
"/Zc:inline", # Remove unreferenced COMDAT (faster links).
|
|
]
|
|
if (!is_asan) {
|
|
common_optimize_on_cflags += [
|
|
# Put data in separate COMDATs. This allows the linker
|
|
# to put bit-identical constants at the same address even if
|
|
# they're unrelated constants, which saves binary size.
|
|
# This optimization can't be used when ASan is enabled because
|
|
# it is not compatible with the ASan ODR checker.
|
|
"/Gw",
|
|
]
|
|
}
|
|
common_optimize_on_ldflags = []
|
|
|
|
# /OPT:ICF is not desirable in Debug builds, since code-folding can result in
|
|
# misleading symbols in stack traces. It is also incompatible with
|
|
# incremental linking, which we enable for both Debug and component builds.
|
|
if (!is_debug && !is_component_build) {
|
|
common_optimize_on_ldflags += [ "/OPT:ICF" ] # Redundant COMDAT folding.
|
|
}
|
|
|
|
if (is_official_build) {
|
|
common_optimize_on_ldflags += [ "/OPT:REF" ] # Remove unreferenced data.
|
|
|
|
if (!use_lld && !is_clang) {
|
|
common_optimize_on_ldflags += [
|
|
# Set the number of LTCG code-gen threads to eight. The default is four.
|
|
# This gives a 5-10% link speedup.
|
|
"/cgthreads:8",
|
|
]
|
|
if (use_incremental_wpo) {
|
|
# Incremental Link-time code generation.
|
|
common_optimize_on_ldflags += [ "/LTCG:INCREMENTAL" ]
|
|
} else {
|
|
common_optimize_on_ldflags += [ "/LTCG" ] # Link-time code generation.
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
common_optimize_on_cflags = []
|
|
common_optimize_on_ldflags = []
|
|
|
|
if (is_ohos) {
|
|
common_optimize_on_ldflags += [
|
|
# Warn in case of text relocations.
|
|
"-Wl,--warn-shared-textrel",
|
|
]
|
|
}
|
|
|
|
if (is_mac || is_ios) {
|
|
if (symbol_level == 2) {
|
|
# Mac dead code stripping requires symbols.
|
|
common_optimize_on_ldflags += [ "-Wl,-dead_strip" ]
|
|
}
|
|
} else if (current_os != "aix") {
|
|
# Non-Mac Posix flags.
|
|
# Aix does not support these.
|
|
|
|
common_optimize_on_cflags += [
|
|
# 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",
|
|
]
|
|
|
|
common_optimize_on_ldflags += [
|
|
# Specifically tell the linker to perform optimizations.
|
|
# See http://lwn.net/Articles/192624/ .
|
|
# -O2 enables string tail merge optimization in gold and lld.
|
|
"-Wl,-O2",
|
|
]
|
|
if (!is_mingw) {
|
|
common_optimize_on_ldflags += [ "-Wl,--gc-sections" ]
|
|
}
|
|
}
|
|
}
|
|
|
|
config("default_stack_frames") {
|
|
if (is_posix) {
|
|
if (enable_frame_pointers) {
|
|
cflags = [ "-fno-omit-frame-pointer" ]
|
|
} else {
|
|
cflags = [ "-fomit-frame-pointer" ]
|
|
}
|
|
}
|
|
# On Windows, the flag to enable framepointers "/Oy-" must always come after
|
|
# the optimization flag [e.g. "/O2"]. The optimization flag is set by one of
|
|
# the "optimize" configs, see rest of this file. The ordering that cflags are
|
|
# applied is well-defined by the GN spec, and there is no way to ensure that
|
|
# cflags set by "default_stack_frames" is applied after those set by an
|
|
# "optimize" config. Similarly, there is no way to propagate state from this
|
|
# config into the "optimize" config. We always apply the "/Oy-" config in the
|
|
# definition for common_optimize_on_cflags definition, even though this may
|
|
# not be correct.
|
|
}
|
|
|
|
# Default "optimization on" config.
|
|
config("optimize") {
|
|
if (optimize_for_size && !is_nacl) {
|
|
# Favor size over speed.
|
|
if (is_clang) {
|
|
cflags = [ "-O2" ] + common_optimize_on_cflags
|
|
} else {
|
|
cflags = [ "-Os" ] + common_optimize_on_cflags
|
|
}
|
|
} else {
|
|
cflags = [ "-O2" ] + common_optimize_on_cflags
|
|
}
|
|
ldflags = common_optimize_on_ldflags
|
|
}
|
|
|
|
# Same config as 'optimize' but without the WPO flag.
|
|
config("optimize_no_wpo") {
|
|
if (is_win) {
|
|
# Favor size over speed, /O1 must be before the common flags. The GYP
|
|
# build also specifies /Os and /GF but these are implied by /O1.
|
|
cflags = [ "/O1" ] + common_optimize_on_cflags + [ "/Oi" ]
|
|
} else if (optimize_for_size && !is_nacl) {
|
|
# Favor size over speed.
|
|
if (is_clang) {
|
|
cflags = [ "-Oz" ] + common_optimize_on_cflags
|
|
} else {
|
|
cflags = [ "-Os" ] + common_optimize_on_cflags
|
|
}
|
|
} else if (optimize_for_fuzzing) {
|
|
cflags = [ "-O0" ] + common_optimize_on_cflags
|
|
} else {
|
|
cflags = [ "-O2" ] + common_optimize_on_cflags
|
|
}
|
|
ldflags = common_optimize_on_ldflags
|
|
}
|
|
|
|
# Turn off optimizations.
|
|
config("no_optimize") {
|
|
if (is_win) {
|
|
cflags = [
|
|
"/Od", # Disable optimization.
|
|
"/Ob0", # Disable all inlining (on by default).
|
|
"/GF", # Enable string pooling (off by default).
|
|
]
|
|
} else if ((is_ohos || is_android) && !ohos_full_debug) {
|
|
# On ohos we kind of optimize some things that don't affect debugging
|
|
# much even when optimization is disabled to get the binary size down.
|
|
if (is_clang) {
|
|
cflags = [ "-Oz" ] + common_optimize_on_cflags
|
|
ldflags = common_optimize_on_ldflags
|
|
} else {
|
|
cflags = [ "-Os" ] + common_optimize_on_cflags
|
|
ldflags = common_optimize_on_ldflags
|
|
}
|
|
} else {
|
|
# On ohos_full_debug mode, we close all optimization
|
|
cflags = [ "-O0" ]
|
|
ldflags = []
|
|
}
|
|
}
|
|
|
|
# Turns up the optimization level. On Windows, this implies whole program
|
|
# optimization and link-time code generation which is very expensive and should
|
|
# be used sparingly.
|
|
config("optimize_max") {
|
|
if (is_nacl && is_nacl_irt) {
|
|
# The NaCl IRT is a special case and always wants its own config.
|
|
# Various components do:
|
|
# if (!is_debug) {
|
|
# configs -= [ "//build/config/compiler:default_optimization" ]
|
|
# configs += [ "//build/config/compiler:optimize_max" ]
|
|
# }
|
|
# So this config has to have the selection logic just like
|
|
# "default_optimization", below.
|
|
configs = [ "//build/config/nacl:irt_optimize" ]
|
|
} else {
|
|
ldflags = common_optimize_on_ldflags
|
|
if (is_win) {
|
|
# Favor speed over size, /O2 must be before the common flags. The GYP
|
|
# build also specifies /Ot, /Oi, and /GF, but these are implied by /O2.
|
|
cflags = [ "/O2" ] + common_optimize_on_cflags
|
|
|
|
if (is_official_build) {
|
|
if (!is_clang) {
|
|
cflags += [
|
|
"/GL", # Whole program optimization.
|
|
|
|
# Disable Warning 4702 ("Unreachable code") for the WPO/PGO builds.
|
|
# Probably anything that this would catch that wouldn't be caught
|
|
# in a normal build isn't going to actually be a bug, so the
|
|
# incremental value of C4702 for PGO builds is likely very small.
|
|
"/wd4702",
|
|
]
|
|
}
|
|
}
|
|
} else if (optimize_for_fuzzing) {
|
|
cflags = [ "-O0" ] + common_optimize_on_cflags
|
|
} else {
|
|
cflags = [ "-O2" ] + common_optimize_on_cflags
|
|
}
|
|
}
|
|
}
|
|
|
|
# This config can be used to override the default settings for per-component
|
|
# and whole-program optimization, optimizing the particular target for speed
|
|
# instead of code size. This config is exactly the same as "optimize_max"
|
|
# except that we use -O3 instead of -O2 on non-win, non-IRT platforms.
|
|
config("optimize_speed") {
|
|
if (is_nacl && is_nacl_irt) {
|
|
# The NaCl IRT is a special case and always wants its own config.
|
|
# Various components do:
|
|
# if (!is_debug) {
|
|
# configs -= [ "//build/config/compiler:default_optimization" ]
|
|
# configs += [ "//build/config/compiler:optimize_max" ]
|
|
# }
|
|
# So this config has to have the selection logic just like
|
|
# "default_optimization", below.
|
|
configs = [ "//build/config/nacl:irt_optimize" ]
|
|
} else {
|
|
ldflags = common_optimize_on_ldflags
|
|
if (is_win) {
|
|
# Favor speed over size, /O2 must be before the common flags. The GYP
|
|
# build also specifies /Ot, /Oi, and /GF, but these are implied by /O2.
|
|
cflags = [ "/O2" ] + common_optimize_on_cflags
|
|
|
|
if (is_official_build && !is_clang) {
|
|
cflags += [
|
|
"/GL", # Whole program optimization.
|
|
|
|
# Disable Warning 4702 ("Unreachable code") for the WPO/PGO builds.
|
|
# Probably anything that this would catch that wouldn't be caught in a
|
|
# normal build isn't going to actually be a bug, so the incremental
|
|
# value of C4702 for PGO builds is likely very small.
|
|
"/wd4702",
|
|
]
|
|
}
|
|
} else if (optimize_for_fuzzing) {
|
|
cflags = [ "-O0" ] + common_optimize_on_cflags
|
|
} else {
|
|
cflags = [ "-O3" ] + common_optimize_on_cflags
|
|
}
|
|
}
|
|
}
|
|
|
|
config("optimize_fuzzing") {
|
|
cflags = [ "-O0" ] + common_optimize_on_cflags
|
|
ldflags = common_optimize_on_ldflags
|
|
visibility = [ ":default_optimization" ]
|
|
}
|
|
|
|
# The default optimization applied to all targets. This will be equivalent to
|
|
# either "optimize" or "no_optimize", depending on the build flags.
|
|
config("default_optimization") {
|
|
if (is_nacl && is_nacl_irt) {
|
|
# The NaCl IRT is a special case and always wants its own config.
|
|
# It gets optimized the same way regardless of the type of build.
|
|
configs = [ "//build/config/nacl:irt_optimize" ]
|
|
} else if (is_debug) {
|
|
configs = [ ":no_optimize" ]
|
|
} else if (optimize_for_fuzzing) {
|
|
assert(!is_win, "Fuzzing optimize level not supported on Windows")
|
|
|
|
# Coverage build is quite slow. Using "optimize_for_fuzzing" makes it even
|
|
# slower as it uses "-O1" instead of "-O3". Prevent that from happening.
|
|
assert(!use_clang_coverage,
|
|
"optimize_for_fuzzing=true should not be used with " +
|
|
"use_clang_coverage=true.")
|
|
configs = [ ":optimize_fuzzing" ]
|
|
} else {
|
|
configs = [ ":optimize" ]
|
|
}
|
|
}
|
|
|
|
_clang_sample_profile = ""
|
|
if (is_clang && current_toolchain == default_toolchain) {
|
|
if (clang_sample_profile_path != "") {
|
|
_clang_sample_profile = clang_sample_profile_path
|
|
} else if (clang_use_default_sample_profile) {
|
|
assert(build_with_chromium,
|
|
"Our default profiles currently only apply to Chromium")
|
|
assert(is_ohos || is_android || is_desktop_linux,
|
|
"The current platform has no default profile")
|
|
_clang_sample_profile = ""
|
|
}
|
|
}
|
|
|
|
# Clang offers a way to assert that AFDO profiles are accurate, which causes it
|
|
# to optimize functions not represented in a profile more aggressively for size.
|
|
# This config can be toggled in cases where shaving off binary size hurts
|
|
# performance too much.
|
|
config("afdo_optimize_size") {
|
|
if (_clang_sample_profile != "" && sample_profile_is_accurate) {
|
|
cflags = [ "-fprofile-sample-accurate" ]
|
|
}
|
|
}
|
|
|
|
# GCC and clang support a form of profile-guided optimization called AFDO.
|
|
# There are some targeted places that AFDO regresses (and an icky interaction
|
|
# between //base/allocator:tcmalloc and AFDO on GCC), so we provide a separate
|
|
# config to allow AFDO to be disabled per-target.
|
|
config("afdo") {
|
|
if (is_clang) {
|
|
if (_clang_sample_profile != "") {
|
|
rebased_clang_sample_profile =
|
|
rebase_path(_clang_sample_profile, root_build_dir)
|
|
cflags = [ "-fprofile-sample-use=${rebased_clang_sample_profile}" ]
|
|
inputs = [ _clang_sample_profile ]
|
|
}
|
|
} else if (auto_profile_path != "" &&
|
|
current_toolchain == default_toolchain) {
|
|
cflags = [ "-fauto-profile=${auto_profile_path}" ]
|
|
inputs = [ auto_profile_path ]
|
|
}
|
|
}
|
|
|
|
# Symbols ----------------------------------------------------------------------
|
|
|
|
# The BUILDCONFIG file sets the "default_symbols" config on targets by
|
|
# default. It will be equivalent to one the three specific symbol levels.
|
|
#
|
|
# You can override the symbol level on a per-target basis by removing the
|
|
# default config and then adding the named one you want:
|
|
#
|
|
# configs -= [ "//build/config/compiler:default_symbols" ]
|
|
# configs += [ "//build/config/compiler:symbols" ]
|
|
|
|
# A helper config that all configs passing /DEBUG to the linker should
|
|
# include as sub-config.
|
|
config("win_pdbaltpath") {
|
|
visibility = [
|
|
":minimal_symbols",
|
|
":symbols",
|
|
]
|
|
|
|
# /DEBUG causes the linker to generate a pdb file, and to write the absolute
|
|
# path to it in the executable file it generates. This flag turns that
|
|
# absolute path into just the basename of the pdb file, which helps with
|
|
# build reproducibility. Debuggers look for pdb files next to executables,
|
|
# so there's no downside to always using this.
|
|
ldflags = [ "/pdbaltpath:%_PDB%" ]
|
|
}
|
|
|
|
# Full symbols.
|
|
config("symbols") {
|
|
if (is_win) {
|
|
if (is_clang) {
|
|
# Note that with VC++ this requires is_win_fastlink, enforced elsewhere.
|
|
cflags = [ "/Z7" ] # Debug information in the .obj files.
|
|
} else {
|
|
cflags = [ "/Zi" ] # Produce PDB file, no edit and continue.
|
|
}
|
|
|
|
if (is_win_fastlink && !use_lld) {
|
|
# Tell VS 2015+ to create a PDB that references debug
|
|
# information in .obj and .lib files instead of copying
|
|
# it all. This flag is incompatible with /PROFILE
|
|
ldflags = [ "/DEBUG:FASTLINK" ]
|
|
} else if (is_clang && use_lld && use_ghash) {
|
|
cflags += [
|
|
"-mllvm",
|
|
"-emit-codeview-ghash-section",
|
|
]
|
|
ldflags = [ "/DEBUG:GHASH" ]
|
|
} else {
|
|
ldflags = [ "/DEBUG" ]
|
|
}
|
|
|
|
# All configs using /DEBUG should include this:
|
|
configs = [ ":win_pdbaltpath" ]
|
|
|
|
if (is_clang) {
|
|
# /DEBUG:FASTLINK requires every object file to have standalone debug
|
|
# information.
|
|
if (is_win_fastlink && !use_lld) {
|
|
cflags += [ "-fstandalone-debug" ]
|
|
} else {
|
|
cflags += [ "-fno-standalone-debug" ]
|
|
}
|
|
}
|
|
} else {
|
|
if (is_mac) {
|
|
cflags = [ "-gdwarf-2" ]
|
|
if (is_mac && enable_dsyms) {
|
|
# If generating dSYMs, specify -fno-standalone-debug. This was
|
|
# originally specified for https://crbug.com/479841 because dsymutil
|
|
# could not handle a 4GB dSYM file. But dsymutil from Xcodes prior to
|
|
# version 7 also produces debug data that is incompatible with Breakpad
|
|
# dump_syms, so this is still required (https://crbug.com/622406).
|
|
cflags += [ "-fno-standalone-debug" ]
|
|
}
|
|
} else {
|
|
cflags = []
|
|
if (!use_debug_fission && current_cpu == "arm") {
|
|
# dump_syms has issues with dwarf4 on arm, https://crbug.com/744956
|
|
#
|
|
# debug fission needs DWARF DIEs to be emitted at version 4.
|
|
# Chrome OS emits Debug Frame in DWARF1 to make breakpad happy. [1]
|
|
# Unless ohos needs debug fission, DWARF3 is the simplest solution.
|
|
#
|
|
# [1] crrev.com/a81d5ade0b043208e06ad71a38bcf9c348a1a52f
|
|
cflags += [ "-gdwarf-3" ]
|
|
}
|
|
if (!ohos_full_debug) {
|
|
cflags += [ "-g2" ]
|
|
} else {
|
|
# Set -g3 symbol level when ohos_full_debug is true
|
|
cflags += [ "-g3" ]
|
|
}
|
|
}
|
|
if (use_debug_fission && !is_nacl && !(is_ohos || is_android)) {
|
|
# NOTE: Some Chrome OS builds globally set |use_debug_fission| to true,
|
|
# but they also build some targets against ohos toolchains which aren't
|
|
# compatible with it.
|
|
cflags += [ "-gsplit-dwarf" ]
|
|
}
|
|
asmflags = cflags
|
|
ldflags = []
|
|
|
|
if (!is_mac && !is_nacl && current_cpu != "x86" && (use_gold || use_lld)) {
|
|
if (is_clang) {
|
|
# This flag enables the GNU-format pubnames and pubtypes sections,
|
|
# which lld needs in order to generate a correct GDB index.
|
|
cflags += [ "-ggnu-pubnames" ]
|
|
}
|
|
ldflags += [ "-Wl,--gdb-index" ]
|
|
}
|
|
}
|
|
}
|
|
|
|
# Minimal symbols.
|
|
# This config guarantees to hold symbol for stack trace which are shown to user
|
|
# when crash happens in unittests running on buildbot.
|
|
config("minimal_symbols") {
|
|
if (is_win) {
|
|
# Linker symbols for backtraces only.
|
|
cflags = []
|
|
ldflags = [ "/DEBUG" ]
|
|
|
|
# All configs using /DEBUG should include this:
|
|
configs = [ ":win_pdbaltpath" ]
|
|
|
|
# For win/asan, get stack traces with full line numbers.
|
|
# AddressSanitizerTests.TestAddressSanitizer needs this, and since
|
|
# win/asan isn't a default cq bot the build time hit is ok.
|
|
if (is_clang && using_sanitizer) {
|
|
# -gline-tables-only is the same as -g1, but clang-cl only exposes the
|
|
# former.
|
|
cflags += [ "-gline-tables-only" ]
|
|
}
|
|
} else {
|
|
cflags = []
|
|
if (current_cpu == "arm") {
|
|
# dump_syms has issues with dwarf4 on arm, https://crbug.com/744956
|
|
cflags += [ "-gdwarf-3" ]
|
|
}
|
|
cflags += [ "-g1" ]
|
|
ldflags = []
|
|
if ((is_ohos || is_android) && is_clang) {
|
|
# ohos defaults to symbol_level=1 builds in production builds
|
|
# (https://crbug.com/648948), but clang, unlike gcc, doesn't emit
|
|
# DW_AT_linkage_name in -g1 builds. -fdebug-info-for-profiling enables
|
|
# that (and a bunch of other things we don't need), so that we get
|
|
# qualified names in stacks.
|
|
cflags += [ "-fdebug-info-for-profiling" ]
|
|
}
|
|
|
|
# Note: -gsplit-dwarf implicitly turns on -g2 with clang, so don't pass it.
|
|
asmflags = cflags
|
|
}
|
|
}
|
|
|
|
# No symbols.
|
|
config("no_symbols") {
|
|
if (!is_win) {
|
|
cflags = [ "-g0" ]
|
|
asmflags = cflags
|
|
}
|
|
}
|
|
|
|
# Default symbols.
|
|
config("default_symbols") {
|
|
if (symbol_level == 0) {
|
|
configs = [ ":no_symbols" ]
|
|
} else if (symbol_level == 1) {
|
|
configs = [ ":minimal_symbols" ]
|
|
} else if (symbol_level == 2) {
|
|
configs = [ ":symbols" ]
|
|
} else {
|
|
assert(false)
|
|
}
|
|
|
|
# This config is removed by base unittests app.
|
|
if ((is_ohos || is_android) && is_clang && strip_debug_info) {
|
|
configs += [ ":strip_debug" ]
|
|
}
|
|
}
|
|
|
|
config("strip_debug") {
|
|
if (!defined(ldflags)) {
|
|
ldflags = []
|
|
}
|
|
ldflags += [ "-Wl,--strip-debug" ]
|
|
}
|
|
|
|
if (is_mac) {
|
|
# On Mac and iOS, this enables support for ARC (automatic ref-counting).
|
|
# See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
|
|
config("enable_arc") {
|
|
common_flags = [ "-fobjc-arc" ]
|
|
cflags_objc = common_flags
|
|
cflags_objcc = common_flags
|
|
}
|
|
}
|
|
|
|
config("no_common") {
|
|
if (is_clang) {
|
|
cflags = [ "-fno-common" ]
|
|
asmflags = cflags
|
|
}
|
|
}
|