| # 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. |
| |
| import("//build/config/android/config.gni") |
| import("//build/config/chrome_build.gni") |
| import("//build/config/chromecast_build.gni") |
| import("//build/config/compiler/compiler.gni") |
| import("//build/config/nacl/config.gni") |
| import("//build/toolchain/cc_wrapper.gni") |
| import("//build/toolchain/toolchain.gni") |
| import("//build_overrides/build.gni") |
| |
| if (current_cpu == "arm" || current_cpu == "arm64") { |
| import("//build/config/arm.gni") |
| } |
| if (current_cpu == "mipsel" || current_cpu == "mips64el") { |
| import("//build/config/mips.gni") |
| } |
| if (is_mac) { |
| import("//build/config/mac/symbols.gni") |
| } |
| if (is_ios) { |
| import("//build/config/ios/ios_sdk.gni") |
| } |
| |
| declare_args() { |
| # Default to warnings as errors for default workflow, where we catch |
| # warnings with known toolchains. Allow overriding this e.g. for Chromium |
| # builds on Linux that could use a different version of the compiler. |
| # With GCC, warnings in no-Chromium code are always not treated as errors. |
| treat_warnings_as_errors = true |
| |
| # Normally, Android builds are lightly optimized, even for debug builds, to |
| # keep binary size down. Setting this flag to true disables such optimization |
| android_full_debug = false |
| |
| # Whether to use the binary binutils checked into third_party/binutils. |
| # These are not multi-arch so cannot be used except on x86 and x86-64 (the |
| # only two architectures that are currently checked in). Turn this off when |
| # you are using a custom toolchain and need to control -B in cflags. |
| linux_use_bundled_binutils = |
| linux_use_bundled_binutils_override && is_linux && |
| (current_cpu == "x64" || current_cpu == "x86") |
| binutils_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin", |
| root_build_dir) |
| |
| # Compile in such a way as to make it possible for the profiler to unwind full |
| # stack frames. Setting this flag has a large effect on the performance of the |
| # generated code than just setting profiling, but gives the profiler more |
| # information to analyze. |
| # Requires profiling to be set to true. |
| enable_full_stack_frames_for_profiling = false |
| |
| # When we are going to use gold we need to find it. |
| # This is initialized below, after use_gold might have been overridden. |
| gold_path = false |
| |
| if (is_win) { |
| # Whether the VS xtree header has been patched to disable warning 4702. If |
| # it has, then we don't need to disable 4702 (unreachable code warning). |
| # The patch is preapplied to the internal toolchain and hence all bots. |
| msvs_xtree_patched = false |
| } |
| |
| # Omit unwind support in official builds to save space. |
| # We can use breakpad for these builds. |
| exclude_unwind_tables = (is_chrome_branded && is_official_build) || |
| (is_chromecast && !is_cast_desktop_build && !is_debug) |
| |
| # If true, optimize for size. Does not affect windows builds. |
| # Linux & Mac favor speed over size. |
| # TODO(brettw) it's weird that Mac and desktop Linux are different. We should |
| # explore favoring size over speed in this case as well. |
| optimize_for_size = is_android || is_ios |
| |
| # Enable fatal linker warnings. Building Chromium with certain versions |
| # of binutils can cause linker warning. |
| # See: https://bugs.chromium.org/p/chromium/issues/detail?id=457359 |
| fatal_linker_warnings = true |
| |
| # Build with C++ RTTI enabled. Chromium builds without RTTI by default, |
| # but some sanitizers are known to require it, like CFI diagnostics |
| # and UBsan variants. |
| use_rtti = use_cfi_diag || is_ubsan_vptr || is_ubsan_security |
| |
| # AFDO (Automatic Feedback Directed Optimizer) is a form of profile-guided |
| # optimization that GCC supports. It used by ChromeOS in their official |
| # builds. To use it, set auto_profile_path to the path to a file containing |
| # the needed gcov profiling data. |
| auto_profile_path = "" |
| |
| # Optimize for coverage guided fuzzing (balance between speed and number of |
| # branches) |
| optimize_for_fuzzing = false |
| |
| # Optimize symbol files for maximizing goma cache hit rate. This isn't |
| # on by default when goma is enabled because setting this to true may make |
| # it harder to debug binaries. |
| strip_absolute_paths_from_debug_symbols = false |
| } |
| |
| if (is_clang && !is_nacl) { |
| update_args = [ "--print-revision" ] |
| if (llvm_force_head_revision) { |
| update_args += [ "--llvm-force-head-revision" ] |
| } |
| clang_revision = |
| exec_script("//tools/clang/scripts/update.py", update_args, "trim string") |
| } |
| |
| # Apply the default logic for these values if they were not set explicitly. |
| if (gold_path == false) { |
| if (use_gold) { |
| gold_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin", |
| root_build_dir) |
| } else { |
| gold_path = "" |
| } |
| } |
| |
| if (use_debug_fission == "default") { |
| use_debug_fission = is_debug && !is_win && use_gold && |
| linux_use_bundled_binutils && cc_wrapper == "" |
| } |
| |
| # default_include_dirs --------------------------------------------------------- |
| # |
| # This is a separate config so that third_party code (which would not use the |
| # source root and might have conflicting versions of some headers) can remove |
| # this and specify their own include paths. |
| config("default_include_dirs") { |
| include_dirs = [ |
| "//", |
| root_gen_dir, |
| ] |
| } |
| |
| # compiler --------------------------------------------------------------------- |
| # |
| # Base compiler configuration. |
| # |
| # See also "runtime_library" below for related stuff and a discussion about |
| # where stuff should go. Put warning related stuff in the "warnings" config. |
| |
| config("compiler") { |
| asmflags = [] |
| cflags = [] |
| cflags_c = [] |
| cflags_cc = [] |
| cflags_objc = [] |
| cflags_objcc = [] |
| ldflags = [] |
| defines = [] |
| configs = [] |
| |
| # 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:compiler" ] |
| } else if (is_android) { |
| configs += [ "//build/config/android:compiler" ] |
| } else if (is_linux) { |
| configs += [ "//build/config/linux:compiler" ] |
| } else if (is_nacl) { |
| configs += [ "//build/config/nacl:compiler" ] |
| } else if (is_ios || is_mac) { |
| configs += [ "//build/config/mac:compiler" ] |
| } |
| |
| # See the definitions below. |
| configs += [ |
| ":compiler_cpu_abi", |
| ":compiler_codegen", |
| ] |
| |
| # In general, Windows is totally different, but all the other builds share |
| # some common GCC configuration. |
| if (!is_win) { |
| # Common GCC compiler flags setup. |
| # -------------------------------- |
| cflags += [ "-fno-strict-aliasing" ] # See http://crbug.com/32204 |
| cflags_cc += [ |
| # Not exporting C++ inline functions can generally be applied anywhere |
| # so we do so here. Normal function visibility is controlled by |
| # //build/config/gcc:symbol_visibility_hidden. |
| "-fvisibility-inlines-hidden", |
| ] |
| |
| # Stack protection. |
| if (is_mac) { |
| # The strong variant of the stack protector significantly increases |
| # binary size, so only enable it in debug mode. |
| if (is_debug) { |
| cflags += [ "-fstack-protector-strong" ] |
| } else { |
| cflags += [ "-fstack-protector" ] |
| } |
| } else if (is_posix && !is_chromeos && !is_nacl) { |
| # TODO(phajdan.jr): Use -fstack-protector-strong when our gcc supports it. |
| # See also https://crbug.com/533294 |
| cflags += [ "--param=ssp-buffer-size=4" ] |
| |
| # The x86 toolchain currently has problems with stack-protector. |
| if (is_android && current_cpu == "x86") { |
| cflags += [ "-fno-stack-protector" ] |
| } else { |
| cflags += [ "-fstack-protector" ] |
| } |
| } |
| |
| # Linker warnings. |
| if (fatal_linker_warnings && !(is_chromeos && current_cpu == "arm") && |
| !(is_android && use_order_profiling) && !is_mac && !is_ios) { |
| # TODO(jochen): Enable this on chromeos on arm. http://crbug.com/356580 |
| # TODO(lizeb,pasko): Fix link errors when linking with order_profiling=1 |
| # crbug.com/485542 |
| ldflags += [ "-Wl,--fatal-warnings" ] |
| } |
| } |
| |
| # Eliminate build metadata (__DATE__, __TIME__ and __TIMESTAMP__) for |
| # deterministic build. See https://crbug.com/314403 |
| if (!is_official_build) { |
| if (is_win && !is_clang) { |
| cflags += [ |
| "/wd4117", # Trying to define or undefine a predefined macro. |
| "/D__DATE__=", |
| "/D__TIME__=", |
| "/D__TIMESTAMP__=", |
| ] |
| } else { |
| cflags += [ |
| "-Wno-builtin-macro-redefined", |
| "-D__DATE__=", |
| "-D__TIME__=", |
| "-D__TIMESTAMP__=", |
| ] |
| } |
| } |
| |
| if (is_clang && is_debug) { |
| # Allow comparing the address of references and 'this' against 0 |
| # in debug builds. Technically, these can never be null in |
| # well-defined C/C++ and Clang can optimize such checks away in |
| # release builds, but they may be used in asserts in debug builds. |
| cflags_cc += [ |
| "-Wno-undefined-bool-conversion", |
| "-Wno-tautological-undefined-compare", |
| ] |
| } |
| |
| if (is_clang && !is_nacl) { |
| # This is here so that all files get recompiled after a clang roll and |
| # when turning clang on or off. (defines are passed via the command line, |
| # and build system rebuild things when their commandline changes). Nothing |
| # should ever read this define. |
| defines += [ "CR_CLANG_REVISION=\"$clang_revision\"" ] |
| } |
| |
| # Non-Mac Posix compiler flags setup. |
| # ----------------------------------- |
| if (is_posix && !(is_mac || is_ios)) { |
| if (enable_profiling) { |
| if (!is_debug) { |
| cflags += [ "-g" ] |
| |
| if (enable_full_stack_frames_for_profiling) { |
| cflags += [ |
| "-fno-inline", |
| "-fno-optimize-sibling-calls", |
| ] |
| } |
| } |
| } |
| |
| if (is_official_build) { |
| # Explicitly pass --build-id to ld. Compilers used to always pass this |
| # implicitly but don't any more (in particular clang when built without |
| # ENABLE_LINKER_BUILD_ID=ON). The crash infrastructure does need a build |
| # id, so explicitly enable it in official builds. It's not needed in |
| # unofficial builds and computing it does slow down the link, so go with |
| # faster links in unofficial builds. |
| ldflags += [ "-Wl,--build-id=sha1" ] |
| } |
| |
| defines += [ "_FILE_OFFSET_BITS=64" ] |
| |
| if (!is_android) { |
| defines += [ |
| "_LARGEFILE_SOURCE", |
| "_LARGEFILE64_SOURCE", |
| ] |
| } |
| |
| if (!is_nacl) { |
| if (exclude_unwind_tables) { |
| cflags += [ |
| "-fno-unwind-tables", |
| "-fno-asynchronous-unwind-tables", |
| ] |
| defines += [ "NO_UNWIND_TABLES" ] |
| } else { |
| cflags += [ "-funwind-tables" ] |
| } |
| } |
| } |
| |
| # Linux/Android common flags setup. |
| # --------------------------------- |
| if (is_linux || is_android) { |
| if (use_pic) { |
| cflags += [ "-fPIC" ] |
| ldflags += [ "-fPIC" ] |
| } |
| |
| # Use pipes for communicating between sub-processes. Faster. |
| cflags += [ "-pipe" ] |
| |
| ldflags += [ |
| "-Wl,-z,noexecstack", |
| "-Wl,-z,now", |
| "-Wl,-z,relro", |
| ] |
| if (!using_sanitizer) { |
| if (!use_cfi_diag) { |
| ldflags += [ "-Wl,-z,defs" ] |
| } |
| |
| # Functions interposed by the sanitizers can make ld think |
| # that some libraries aren't needed when they actually are, |
| # http://crbug.com/234010. As workaround, disable --as-needed. |
| if (!is_nacl && !is_android) { |
| # TODO(pcc): Fix linker bug which requires us to link pthread |
| # unconditionally here (crbug.com/623236). |
| ldflags += [ |
| "-Wl,--no-as-needed", |
| "-lpthread", |
| ] |
| } |
| ldflags += [ "-Wl,--as-needed" ] |
| } |
| } |
| |
| # Linux-specific compiler flags setup. |
| # ------------------------------------ |
| if (is_android && is_clang) { |
| _rebased_android_toolchain_root = |
| rebase_path(android_toolchain_root, root_build_dir) |
| |
| # Let clang find the linker in the NDK. |
| ldflags += [ "--gcc-toolchain=$_rebased_android_toolchain_root" ] |
| } |
| |
| if (is_posix && use_lld && !is_nacl) { |
| ldflags += [ "-fuse-ld=lld" ] |
| } else if (use_gold) { |
| ldflags += [ "-fuse-ld=gold" ] |
| if (is_android) { |
| # Use -mstackrealign due to a bug on ia32 Jelly Bean. |
| # See crbug.com/521527 |
| if (current_cpu == "x86") { |
| cflags += [ "-mstackrealign" ] |
| } |
| } else { |
| # On Android, this isn't needed. gcc in the NDK knows to look next to |
| # it with -fuse-ld=gold, and clang gets a --gcc-toolchain flag passed |
| # above. |
| ldflags += [ "-B$gold_path" ] |
| |
| if (linux_use_bundled_binutils) { |
| ldflags += [ |
| # Experimentation found that using four linking threads |
| # saved ~20% of link time. |
| # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36 |
| # Only apply this to the target linker, since the host |
| # linker might not be gold, but isn't used much anyway. |
| "-Wl,--threads", |
| "-Wl,--thread-count=4", |
| ] |
| } |
| } |
| |
| # TODO(thestig): Make this flag work with GN. |
| #if (!is_official_build && !is_chromeos && !(is_asan || is_lsan || is_tsan || is_msan)) { |
| # ldflags += [ |
| # "-Wl,--detect-odr-violations", |
| # ] |
| #} |
| } else if (linux_use_bundled_binutils) { |
| # Gold is the default linker for the bundled binutils so we explicitly |
| # enable the bfd linker when use_gold is not set. |
| ldflags += [ "-fuse-ld=bfd" ] |
| } |
| |
| if (is_posix && (use_gold || (use_lld && !is_nacl)) && !using_sanitizer && |
| !(is_android && use_order_profiling)) { |
| # TODO(crbug.com/576197) - gcc on x86 platforms + gold + icf=all |
| # doesn't currently work on non-chromeos platforms. |
| # Additionally, on Android x86 --icf=safe seems to cause issues as well. |
| # Additionally, on cast Android x86, --icf=all causes issues. |
| if (is_android && current_cpu == "x86") { |
| ldflags += [ "-Wl,--icf=none" ] |
| } else if ((is_clang && !is_android) || is_chromeos || |
| (current_cpu != "x86" && current_cpu != "x64")) { |
| # TODO(thakis): Remove `!is_android` above once our gold has been rolled |
| # with the fix for https://sourceware.org/bugzilla/show_bug.cgi?id=17704 |
| # merged. See also https://crbug.com/663886 |
| ldflags += [ "-Wl,--icf=all" ] |
| } else if (!is_android || is_clang) { |
| ldflags += [ "-Wl,--icf=safe" ] |
| } |
| } |
| |
| if (linux_use_bundled_binutils) { |
| cflags += [ "-B$binutils_path" ] |
| } |
| |
| # Clang-specific compiler flags setup. |
| # ------------------------------------ |
| if (is_clang) { |
| cflags += [ "-fcolor-diagnostics" ] |
| } |
| |
| # Print absolute paths in diagnostics. There is no precedent for doing this |
| # on Linux/Mac (GCC doesn't support it), but MSVC does this with /FC and |
| # Windows developers rely on it (crbug.com/636109) so only do this on Windows. |
| if (is_clang && is_win) { |
| cflags += [ "-fdiagnostics-absolute-paths" ] |
| } |
| |
| # Makes builds independent of absolute file path. |
| # clang-cl (used if is_win) doesn't expose this flag. |
| # Currently disabled for nacl since its toolchain lacks this flag (too old). |
| # TODO(zforman): Once nacl's toolchain is updated, remove check. |
| if (is_clang && is_linux && strip_absolute_paths_from_debug_symbols) { |
| absolute_path = rebase_path("//.") |
| cflags += [ "-fdebug-prefix-map=$absolute_path=." ] |
| } |
| |
| # C++11 compiler flags setup. |
| # --------------------------- |
| if (is_linux || is_android || (is_nacl && is_clang)) { |
| # gnu++11 instead of c++11 is needed because some code uses typeof() (a |
| # GNU extension). |
| # TODO(thakis): Eventually switch this to c++11 instead, |
| # http://crbug.com/427584 |
| cflags_cc += [ "-std=gnu++11" ] |
| } else if (!is_win && !is_nacl) { |
| # TODO(mcgrathr) - the NaCl GCC toolchain doesn't support either gnu++11 |
| # or c++11; we technically don't need this toolchain any more, but there |
| # are still a few buildbots using it, so until those are turned off |
| # we need the !is_nacl clause and the (is_nacl && is_clang) clause, above. |
| cflags_cc += [ "-std=c++11" ] |
| } |
| |
| if (is_mac) { |
| cflags_cc += [ "-stdlib=libc++" ] |
| ldflags += [ "-stdlib=libc++" ] |
| } |
| |
| # Add flags for link-time optimization. These flags enable |
| # optimizations/transformations that require whole-program visibility at link |
| # time, so they need to be applied to all translation units, and we may end up |
| # with miscompiles if only part of the program is compiled with LTO flags. For |
| # that reason, we cannot allow targets to enable or disable these flags, for |
| # example by disabling the optimize configuration. |
| # TODO(pcc): Make this conditional on is_official_build rather than on gn |
| # flags for specific features. |
| if (!is_debug && (allow_posix_link_time_opt || is_cfi) && !is_nacl) { |
| if (use_thin_lto) { |
| cflags += [ "-flto=thin" ] |
| ldflags += [ "-flto=thin" ] |
| |
| # Limit the parallelism to avoid too agressive competition between |
| # linker jobs. This is still suboptimal to a potential dynamic |
| # resource allocation scheme, but should be good enough. |
| if (use_lld) { |
| ldflags += [ |
| "-Wl,--thinlto-jobs=8", |
| "-Wl,--thinlto-cache-dir=" + |
| rebase_path("$root_out_dir/thinlto-cache", root_build_dir), |
| ] |
| } else { |
| ldflags += [ "-Wl,-plugin-opt,jobs=8" ] |
| } |
| } else { |
| # Note: ThinLTO does not currently have this feature implemented |
| # For Full LTO, it provides a measurable runtime speedup of Chrome. |
| cflags += [ |
| "-flto", |
| "-fwhole-program-vtables", |
| ] |
| ldflags += [ |
| "-flto", |
| "-fwhole-program-vtables", |
| ] |
| |
| # Apply a lower LTO optimization level as the default is too slow. |
| if (is_linux) { |
| if (use_lld) { |
| ldflags += [ "-Wl,--lto-O1" ] |
| } else { |
| ldflags += [ "-Wl,-plugin-opt,O1" ] |
| } |
| } else if (is_mac) { |
| ldflags += [ "-Wl,-mllvm,-O1" ] |
| } |
| } |
| |
| # Work-around for http://openradar.appspot.com/20356002 |
| if (is_mac) { |
| ldflags += [ "-Wl,-all_load" ] |
| } |
| |
| # Allows the linker to apply --gc-sections and ICF to the LTO object file. |
| # Also, when targeting ARM, without this flag, LTO produces a .text section |
| # that is larger than the maximum call displacement, preventing the linker |
| # from relocating calls (http://llvm.org/PR22999). |
| if (is_linux) { |
| if (use_lld) { |
| ldflags += [ |
| "-Wl,-mllvm,-function-sections", |
| "-Wl,-mllvm,-data-sections", |
| ] |
| } else { |
| ldflags += [ |
| "-Wl,-plugin-opt,-function-sections", |
| "-Wl,-plugin-opt,-data-sections", |
| ] |
| } |
| } |
| } |
| |
| # 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 is separate from :compiler (and not even a sub-config there) |
| # so that some targets can remove it from the list with: |
| # configs -= [ "//build/config/compiler:pthread" ] |
| config("pthread") { |
| if (is_linux) { |
| cflags = [ "-pthread" ] |
| ldflags = [ "-pthread" ] |
| } |
| } |
| |
| # 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 = [] |
| |
| 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_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=$arm_tune" ] |
| } |
| } else if (current_cpu == "arm64") { |
| if (is_clang && !is_android && !is_nacl) { |
| cflags += [ "--target=aarch64-linux-gnu" ] |
| ldflags += [ "--target=aarch64-linux-gnu" ] |
| } |
| } else if (current_cpu == "mipsel" && !is_nacl) { |
| if (mips_arch_variant == "r6") { |
| if (is_clang) { |
| cflags += [ |
| "--target=mipsel-linux-gnu", |
| "-march=mips32r6", |
| ] |
| ldflags += [ "--target=mipsel-linux-gnu" ] |
| } else { |
| cflags += [ |
| "-mips32r6", |
| "-Wa,-mips32r6", |
| ] |
| if (is_android) { |
| ldflags += [ |
| "-mips32r6", |
| "-Wl,-melf32ltsmip", |
| ] |
| } |
| } |
| if (mips_use_msa == true) { |
| cflags += [ |
| "-mmsa", |
| "-mfp64", |
| ] |
| } |
| } else if (mips_arch_variant == "r2") { |
| if (is_clang) { |
| if (is_android) { |
| cflags += [ |
| "--target=mipsel-linux-android", |
| "-march=mipsel", |
| "-mcpu=mips32r2", |
| ] |
| ldflags += [ "--target=mipsel-linux-android" ] |
| } else { |
| cflags += [ |
| "--target=mipsel-linux-gnu", |
| "-march=mipsel", |
| "-mcpu=mips32r2", |
| ] |
| ldflags += [ "--target=mipsel-linux-gnu" ] |
| } |
| } else { |
| cflags += [ |
| "-mips32r2", |
| "-Wa,-mips32r2", |
| ] |
| if (mips_float_abi == "hard" && mips_fpu_mode != "") { |
| cflags += [ "-m$mips_fpu_mode" ] |
| } |
| } |
| } else if (mips_arch_variant == "r1") { |
| if (is_clang) { |
| if (is_android) { |
| cflags += [ |
| "--target=mipsel-linux-android", |
| "-march=mipsel", |
| "-mcpu=mips32", |
| ] |
| ldflags += [ "--target=mipsel-linux-android" ] |
| } else { |
| cflags += [ |
| "--target=mipsel-linux-gnu", |
| "-march=mipsel", |
| "-mcpu=mips32", |
| ] |
| ldflags += [ "--target=mipsel-linux-gnu" ] |
| } |
| } else { |
| cflags += [ |
| "-mips32", |
| "-Wa,-mips32", |
| ] |
| } |
| } |
| |
| if (mips_dsp_rev == 1) { |
| cflags += [ "-mdsp" ] |
| } else if (mips_dsp_rev == 2) { |
| cflags += [ "-mdspr2" ] |
| } |
| |
| cflags += [ "-m${mips_float_abi}-float" ] |
| } else if (current_cpu == "mips64el") { |
| if (mips_arch_variant == "r6") { |
| if (is_clang) { |
| if (is_android) { |
| cflags += [ |
| "--target=mips64el-linux-android", |
| "-march=mips64el", |
| "-mcpu=mips64r6", |
| ] |
| ldflags += [ "--target=mips64el-linux-android" ] |
| } |
| } else { |
| cflags += [ |
| "-mips64r6", |
| "-Wa,-mips64r6", |
| ] |
| ldflags += [ "-mips64r6" ] |
| } |
| if (mips_use_msa == true) { |
| cflags += [ |
| "-mmsa", |
| "-mfp64", |
| ] |
| } |
| } else if (mips_arch_variant == "r2") { |
| cflags += [ |
| "-mips64r2", |
| "-Wa,-mips64r2", |
| ] |
| ldflags += [ "-mips64r2" ] |
| } |
| } else if (current_cpu == "pnacl" && is_nacl_nonsfi) { |
| if (target_cpu == "x86" || target_cpu == "x64") { |
| cflags += [ |
| "-arch", |
| "x86-32-nonsfi", |
| "--pnacl-bias=x86-32-nonsfi", |
| "--target=i686-unknown-nacl", |
| ] |
| ldflags += [ |
| "-arch", |
| "x86-32-nonsfi", |
| "--target=i686-unknown-nacl", |
| ] |
| } else if (target_cpu == "arm") { |
| cflags += [ |
| "-arch", |
| "arm-nonsfi", |
| "-mfloat-abi=hard", |
| "--pnacl-bias=arm-nonsfi", |
| "--target=armv7-unknown-nacl-gnueabihf", |
| ] |
| ldflags += [ |
| "-arch", |
| "arm-nonsfi", |
| "--target=armv7-unknown-nacl-gnueabihf", |
| ] |
| } |
| } |
| } |
| |
| asmflags = cflags |
| } |
| |
| # 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 && !is_ios) { |
| if (current_cpu == "x86") { |
| if (is_clang) { |
| cflags += [ |
| # Else building libyuv gives clang's register allocator issues, |
| # see llvm.org/PR15798 / crbug.com/233709 |
| "-momit-leaf-frame-pointer", |
| ] |
| } |
| } else if (current_cpu == "arm") { |
| if (is_android && !is_clang) { |
| # Clang doesn't support these flags. |
| cflags += [ |
| # The tree-sra optimization (scalar replacement for |
| # aggregates enabling subsequent optimizations) leads to |
| # invalid code generation when using the Android NDK's |
| # compiler (r5-r7). This can be verified using |
| # webkit_unit_tests' WTF.Checked_int8_t test. |
| "-fno-tree-sra", |
| |
| # The following option is disabled to improve binary |
| # size and performance in gcc 4.9. |
| "-fno-caller-saves", |
| ] |
| } |
| } |
| } |
| |
| asmflags = cflags |
| } |
| |
| # This is separate from :compiler_codegen (and not even a sub-config there) |
| # so that some targets can remove it from the list with: |
| # configs -= [ "//build/config/compiler:clang_stackrealign" ] |
| # See https://crbug.com/556393 for details of where it must be avoided. |
| config("clang_stackrealign") { |
| if (is_clang && current_cpu == "x86" && is_linux) { |
| cflags = [ |
| # Align the stack on 16-byte boundaries, http://crbug.com/418554. |
| "-mstack-alignment=16", |
| "-mstackrealign", |
| ] |
| } |
| } |
| |
| config("compiler_arm_fpu") { |
| if (current_cpu == "arm" && !is_ios && !is_nacl) { |
| cflags = [ "-mfpu=$arm_fpu" ] |
| asmflags = cflags |
| } |
| } |
| |
| config("compiler_arm_thumb") { |
| if (current_cpu == "arm" && arm_use_thumb && is_posix && |
| !(is_mac || is_ios || is_nacl)) { |
| cflags = [ "-mthumb" ] |
| if (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 therefor 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 = [] |
| |
| # 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_ios) { |
| configs += [ "//build/config/ios:runtime_library" ] |
| } else if (is_mac) { |
| configs += [ "//build/config/mac:runtime_library" ] |
| } else if (is_android) { |
| configs += [ "//build/config/android:runtime_library" ] |
| } |
| |
| if (is_posix) { |
| configs += [ "//build/config/posix: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_win) { |
| if (treat_warnings_as_errors) { |
| cflags += [ "/WX" ] |
| } |
| if (fatal_linker_warnings) { |
| ldflags += [ "/WX" ] |
| } |
| |
| cflags += [ |
| # Assume UTF-8 by default to avoid code page dependencies. |
| "/utf-8", |
| ] |
| |
| cflags += [ |
| # Warnings permanently disabled: |
| |
| # C4091: 'typedef ': ignored on left of 'X' when no variable is |
| # declared. |
| # This happens in a number of Windows headers. Dumb. |
| "/wd4091", |
| |
| # C4127: conditional expression is constant |
| # This warning can in theory catch dead code and other problems, but |
| # triggers in far too many desirable cases where the conditional |
| # expression is either set by macros or corresponds some legitimate |
| # compile-time constant expression (due to constant template args, |
| # conditionals comparing the sizes of different types, etc.). Some of |
| # these can be worked around, but it's not worth it. |
| "/wd4127", |
| |
| # C4251: 'identifier' : class 'type' needs to have dll-interface to be |
| # used by clients of class 'type2' |
| # This is necessary for the shared library build. |
| "/wd4251", |
| |
| # C4312 is a VS 2015 64-bit warning for integer to larger pointer. |
| # TODO(brucedawson): fix warnings, crbug.com/554200 |
| "/wd4312", |
| |
| # C4351: new behavior: elements of array 'array' will be default |
| # initialized |
| # This is a silly "warning" that basically just alerts you that the |
| # compiler is going to actually follow the language spec like it's |
| # supposed to, instead of not following it like old buggy versions did. |
| # There's absolutely no reason to turn this on. |
| "/wd4351", |
| |
| # C4355: 'this': used in base member initializer list |
| # It's commonly useful to pass |this| to objects in a class' initializer |
| # list. While this warning can catch real bugs, most of the time the |
| # constructors in question don't attempt to call methods on the passed-in |
| # pointer (until later), and annotating every legit usage of this is |
| # simply more hassle than the warning is worth. |
| "/wd4355", |
| |
| # C4503: 'identifier': decorated name length exceeded, name was |
| # truncated |
| # This only means that some long error messages might have truncated |
| # identifiers in the presence of lots of templates. It has no effect on |
| # program correctness and there's no real reason to waste time trying to |
| # prevent it. |
| "/wd4503", |
| |
| # Warning C4589 says: "Constructor of abstract class ignores |
| # initializer for virtual base class." Disable this warning because it |
| # is flaky in VS 2015 RTM. It triggers on compiler generated |
| # copy-constructors in some cases. |
| "/wd4589", |
| |
| # C4611: interaction between 'function' and C++ object destruction is |
| # non-portable |
| # This warning is unavoidable when using e.g. setjmp/longjmp. MSDN |
| # suggests using exceptions instead of setjmp/longjmp for C++, but |
| # Chromium code compiles without exception support. We therefore have to |
| # use setjmp/longjmp for e.g. JPEG decode error handling, which means we |
| # have to turn off this warning (and be careful about how object |
| # destruction happens in such cases). |
| "/wd4611", |
| |
| # Warnings to evaluate and possibly fix/reenable later: |
| |
| "/wd4100", # Unreferenced formal function parameter. |
| "/wd4121", # Alignment of a member was sensitive to packing. |
| "/wd4244", # Conversion: possible loss of data. |
| "/wd4505", # Unreferenced local function has been removed. |
| "/wd4510", # Default constructor could not be generated. |
| "/wd4512", # Assignment operator could not be generated. |
| "/wd4610", # Class can never be instantiated, constructor required. |
| "/wd4838", # Narrowing conversion. Doesn't seem to be very useful. |
| "/wd4995", # 'X': name was marked as #pragma deprecated |
| "/wd4996", # Deprecated function warning. |
| |
| # These are variable shadowing warnings that are new in VS2015. We |
| # should work through these at some point -- they may be removed from |
| # the RTM release in the /W4 set. |
| "/wd4456", |
| "/wd4457", |
| "/wd4458", |
| "/wd4459", |
| ] |
| |
| cflags_cc += [ |
| # Allow "noexcept" annotations even though we compile with exceptions |
| # disabled. |
| "/wd4577", |
| ] |
| |
| if (current_cpu == "x86") { |
| cflags += [ |
| # VC++ 2015 changes 32-bit size_t truncation warnings from 4244 to |
| # 4267. Example: short TruncTest(size_t x) { return x; } |
| # Since we disable 4244 we need to disable 4267 during migration. |
| # TODO(jschuh): crbug.com/167187 fix size_t to int truncations. |
| "/wd4267", |
| ] |
| } |
| |
| # VS xtree header file needs to be patched or 4702 (unreachable code |
| # warning) is reported if _HAS_EXCEPTIONS=0. Disable the warning if xtree is |
| # not patched. |
| if (!msvs_xtree_patched && |
| exec_script("../../win_is_xtree_patched.py", [], "value") == 0) { |
| cflags += [ "/wd4702" ] # Unreachable code. |
| } |
| |
| # Building with Clang on Windows is a work in progress and very |
| # experimental. See crbug.com/82385. |
| if (is_clang) { |
| cflags += [ |
| # TODO(hans): Make this list shorter eventually, http://crbug.com/504657 |
| "-Wno-microsoft-enum-value", # http://crbug.com/505296 |
| "-Wno-unknown-pragmas", # http://crbug.com/505314 |
| "-Wno-microsoft-cast", # http://crbug.com/550065 |
| ] |
| } |
| } else { |
| if (is_mac && !is_nacl) { |
| # When compiling Objective-C, warns if a method is used whose |
| # availability is newer than the deployment target. This is not |
| # required when compiling Chrome for iOS. |
| cflags += [ "-Wpartial-availability" ] |
| } |
| |
| if (is_ios) { |
| # When compiling Objective-C, warns if a selector named via @selector has |
| # not been defined in any visible interface. |
| cflags += [ "-Wundeclared-selector" ] |
| } |
| |
| # 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", |
| ] |
| |
| # Don't warn about the "typedef 'foo' locally defined but not used" |
| # for gcc 4.8. |
| # TODO: remove this flag once all builds work. See crbug.com/227506 |
| 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" ] |
| } |
| } |
| |
| # 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_chromeos && is_clang && !is_nacl) { |
| # TODO(thakis): Enable this, crbug.com/507717 |
| cflags += [ "-Wno-shift-negative-value" ] |
| } |
| |
| if (is_clang) { |
| cflags += [ |
| # TODO(thakis): Consider -Wloop-analysis (turns on |
| # -Wrange-loop-analysis too). |
| |
| # 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", |
| |
| # Warns on switches on enums that cover all enum values but |
| # also contain a default: branch. Chrome is full of that. |
| "-Wno-covered-switch-default", |
| |
| # TODO(thakis): This used to be implied by -Wno-unused-function, |
| # which we no longer use. Check if it makes sense to remove |
| # this as well. http://crbug.com/316352 |
| "-Wno-unneeded-internal-declaration", |
| |
| # TODO(hans): Get this cleaned up, http://crbug.com/428099 |
| "-Wno-inconsistent-missing-override", |
| ] |
| |
| if (is_linux && target_cpu == "x86") { |
| cflags += [ |
| # TODO(thakis): Remove from 32-bit Linux eventually, https://707084 |
| "-Wno-deprecated-register", |
| ] |
| } |
| |
| # use_xcode_clang only refers to the iOS toolchain, host binaries use |
| # chromium's clang always. |
| if (!is_nacl && (!use_xcode_clang || current_toolchain == host_toolchain)) { |
| # Flags NaCl (Clang 3.7) and Xcode 7.3 (Clang clang-703.0.31) do not |
| # recognize. |
| cflags += [ |
| # TODO(thakis): https://crbug.com/604888 |
| "-Wno-undefined-var-template", |
| |
| # TODO(thakis): https://crbug.com/617318 |
| "-Wno-nonportable-include-path", |
| |
| # TODO(hans): https://crbug.com/637306 |
| "-Wno-address-of-packed-member", |
| |
| # TODO(hans): https://crbug.com/681136 |
| "-Wno-unused-lambda-capture", |
| |
| # TODO(thakis ): https://crbug.com/683349 |
| "-Wno-user-defined-warnings", |
| ] |
| } else if (use_xcode_clang && |
| (xcode_version == "0830" || xcode_version == "0831" || |
| xcode_version == "0832")) { |
| # This is necessary to allow a progressive transition from using xcode 8 to 8.3. Remove when all bots are migrated to 8.3. |
| cflags += [ |
| # TODO(thakis): https://crbug.com/604888 |
| "-Wno-undefined-var-template", |
| |
| # TODO(hans): https://crbug.com/637306 |
| "-Wno-address-of-packed-member", |
| ] |
| } |
| } |
| } |
| |
| # 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. |
| } else { |
| cflags = [ "-Wall" ] |
| if (treat_warnings_as_errors) { |
| 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 -Wextra 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. |
| defines += [ "_FORTIFY_SOURCE=2" ] |
| } |
| |
| if (is_mac || is_ios) { |
| cflags_objc = [ "-Wobjc-missing-property-synthesis" ] |
| cflags_objcc = [ "-Wobjc-missing-property-synthesis" ] |
| } |
| } |
| |
| 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", # TODO(jschuh): 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) { |
| # TODO(thakis): Remove !is_nacl once |
| # https://codereview.webrtc.org/1552863002/ made its way into chromium. |
| 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", |
| ] |
| } |
| |
| if (is_linux || is_android) { |
| cflags_cc += [ |
| # Don't warn about hash_map in third-party code. |
| "-Wno-deprecated", |
| ] |
| } |
| |
| configs = [ ":default_warnings" ] |
| } |
| |
| # 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 |
| } |
| } |
| } |
| |
| # Warnings --------------------------------------------------------------------- |
| |
| # This will generate warnings when using Clang if code generates exit-time |
| # destructors, which will slow down closing the program. |
| # TODO(thakis): Make this a blacklist instead, http://crbug.com/101600 |
| config("wexit_time_destructors") { |
| # TODO: Enable on Windows too, http://crbug.com/404525 |
| if (is_clang && !is_win) { |
| 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. |
| # |
| # TODO(jschuh): crbug.com/167187 fix this and delete this config. |
| config("no_size_t_to_int_warning") { |
| if (is_win && current_cpu == "x64") { |
| 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 |
| # supressing 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 (current_cpu == "mipsel") { |
| cflags += [ "-w" ] |
| } 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. |
| "/d2Zi+", # Improve debugging of optimized code. |
| "/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) { |
| 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. |
| } |
| if (full_wpo_on_official) { |
| if (use_incremental_wpo) { |
| arflags = [ "/LTCG:INCREMENTAL" ] |
| } else { |
| arflags = [ "/LTCG" ] |
| } |
| } |
| } |
| } |
| } else { |
| common_optimize_on_cflags = [] |
| common_optimize_on_ldflags = [] |
| |
| if (is_android) { |
| # TODO(jdduke) Re-enable on mips after resolving linking |
| # issues with libc++ (crbug.com/456380). |
| if (current_cpu != "mipsel" && current_cpu != "mips64el") { |
| 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 { |
| # Non-Mac Posix flags. |
| |
| 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/ . |
| "-Wl,-O1", |
| "-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 (is_win) { |
| # TODO(thakis): Remove is_clang here, https://crbug.com/598772 |
| if (is_official_build && full_wpo_on_official && !is_clang) { |
| common_optimize_on_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", |
| ] |
| } |
| |
| # 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) { |
| # Favor size over speed. |
| 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) { |
| # Favor size over speed. |
| cflags = [ "-Os" ] + common_optimize_on_cflags |
| } else if (optimize_for_fuzzing) { |
| cflags = [ "-O1" ] + 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_android && !android_full_debug) { |
| # On Android we kind of optimize some things that don't affect debugging |
| # much even when optimization is disabled to get the binary size down. |
| cflags = [ "-Os" ] |
| } else { |
| 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_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", |
| ] |
| } |
| # TODO(crbug.com/598772): Enable -flto for Clang. |
| } |
| } else if (optimize_for_fuzzing) { |
| cflags = [ "-O1" ] + 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. |
| # |
| # TODO(crbug.com/621335) - rework how all of these configs are related |
| # so that we don't need this disclaimer. |
| config("optimize_speed") { |
| if (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 |
| |
| # TODO(thakis): Remove is_clang here, https://crbug.com/598772 |
| 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 = [ "-O1" ] + common_optimize_on_cflags |
| } else { |
| cflags = [ "-O3" ] + common_optimize_on_cflags |
| } |
| } |
| } |
| |
| config("optimize_fuzzing") { |
| cflags = [ "-O1" ] + 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_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") |
| configs = [ ":optimize_fuzzing" ] |
| } else { |
| configs = [ ":optimize" ] |
| } |
| } |
| |
| # GCC supports a form of profile-guided optimization called AFDO, which |
| # is used by ChromeOS in their official builds. However, |
| # //base/allocator:tcmalloc currently doesn't work correctly with AFDO |
| # so we provide separate config so that the flag can be disabled per-target. |
| # TODO(crbug.com/633719): Remove this config once tcmalloc works with AFDO |
| # or we remove tcmalloc or we stop using AFDO. |
| config("afdo") { |
| if (auto_profile_path != "" && current_toolchain == default_toolchain) { |
| cflags = [ "-fauto-profile=${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" ] |
| |
| # Full symbols. |
| config("symbols") { |
| if (is_win) { |
| if (use_goma) { |
| # Note that 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) { |
| # 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 { |
| ldflags = [ "/DEBUG" ] |
| } |
| |
| if (is_clang) { |
| # /DEBUG:FASTLINK requires every object file to have standalone debug |
| # information. |
| if (is_win_fastlink) { |
| cflags += [ "-fstandalone-debug" ] |
| } else { |
| cflags += [ "-fno-standalone-debug" ] |
| } |
| } |
| } else { |
| if (is_mac || is_ios) { |
| 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 if (is_android) { |
| # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3 |
| # explicitly on android where we are hitting https://crbug.com/638485. |
| # The arguments MUST be in this order because of a gcc arg parsing bug. |
| cflags = [ |
| "-gdwarf-3", |
| "-g2", |
| ] |
| } else { |
| cflags = [ "-g2" ] |
| } |
| if (use_debug_fission) { |
| cflags += [ "-gsplit-dwarf" ] |
| } |
| asmflags = cflags |
| ldflags = [] |
| |
| # TODO(thakis): Figure out if there's a way to make this go for 32-bit, |
| # currently we get "warning: |
| # obj/native_client/src/trusted/service_runtime/sel_asm/nacl_switch_32.o: |
| # DWARF info may be corrupt; offsets in a range list entry are in different |
| # sections" there. Maybe just a bug in nacl_switch_32.S. |
| # TODO(thakis): Figure out if there's a way to make this go for official |
| # builds, currently get |
| # "third_party/binutils/Linux_x64/Release/bin/ld.gold: warning: |
| # /tmp/lto-llvm-0b5201.o: corrupt debug info in .debug_info" |
| if (!is_mac && !is_ios && !is_nacl && target_cpu != "x86" && |
| (use_gold || use_lld) && !allow_posix_link_time_opt && |
| !is_official_build) { |
| ldflags += [ "-Wl,--gdb-index" ] |
| } |
| } |
| } |
| |
| # Minimal symbols. |
| config("minimal_symbols") { |
| if (is_win) { |
| # Linker symbols for backtraces only. |
| cflags = [] |
| ldflags = [ "/DEBUG" ] |
| } else { |
| if (is_android) { |
| # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3 |
| # explicitly on android where we are hitting https://crbug.com/638485. |
| # The arguments MUST be in this order because of a gcc arg parsing bug. |
| cflags = [ |
| "-gdwarf-3", |
| "-g1", |
| ] |
| } else { |
| cflags = [ "-g1" ] |
| } |
| |
| # Note: -gsplit-dwarf implicitly turns on -g2 with clang, so don't pass it. |
| asmflags = cflags |
| ldflags = [] |
| } |
| } |
| |
| # 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) |
| } |
| } |
| |
| if (is_ios || 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 |
| } |
| } |