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8a73d45c14
There is desire to adjust this flag manually. BUG=762629 R=thakis@chromium.org Change-Id: I3bd134c19270cd1f729b3ea078674e734493d4ab
240 lines
11 KiB
Plaintext
240 lines
11 KiB
Plaintext
# Copyright 2015 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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if (is_android) {
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import("//build/config/android/abi.gni")
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}
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import("//build/config/arm.gni")
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import("//build/config/chrome_build.gni")
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import("//build/config/chromecast_build.gni")
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import("//build/config/compiler/pgo/pgo.gni")
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import("//build/config/sanitizers/sanitizers.gni")
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import("//build/toolchain/goma.gni")
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import("//build/toolchain/toolchain.gni")
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import("//build_overrides/build.gni")
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declare_args() {
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# How many symbols to include in the build. This affects the performance of
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# the build since the symbols are large and dealing with them is slow.
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# 2 means regular build with symbols.
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# 1 means minimal symbols, usually enough for backtraces only. Symbols with
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# internal linkage (static functions or those in anonymous namespaces) may not
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# appear when using this level.
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# 0 means no symbols.
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# -1 means auto-set according to debug/release and platform.
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symbol_level = -1
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# Compile in such a way as to enable profiling of the generated code. For
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# example, don't omit the frame pointer and leave in symbols.
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enable_profiling = false
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# use_debug_fission: whether to use split DWARF debug info
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# files. This can reduce link time significantly, but is incompatible
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# with some utilities such as icecc and ccache. Requires gold and
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# gcc >= 4.8 or clang.
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# http://gcc.gnu.org/wiki/DebugFission
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#
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# This is a placeholder value indicating that the code below should set
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# the default. This is necessary to delay the evaluation of the default
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# value expression until after its input values such as use_gold have
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# been set, e.g. by a toolchain_args() block.
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use_debug_fission = "default"
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# Enables support for ThinLTO, which links 3x-10x faster than full LTO. See
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# also http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html
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# NOTE: See http://crbug.com/871722 to understand why this is disabled for
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# 32-bit Android/ARM
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use_thin_lto =
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is_cfi || (is_android && is_official_build && target_cpu != "arm")
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# Tell VS to create a PDB that references information in .obj files rather
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# than copying it all. This should improve linker performance. mspdbcmf.exe
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# can be used to convert a fastlink pdb to a normal one.
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is_win_fastlink = false
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# Whether or not we should turn on incremental WPO. Only affects the VS
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# Windows build.
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use_incremental_wpo = false
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# Whether or not we should use position independent code.
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use_pic = true
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# Whether we're using a sample profile collected on an architecture different
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# than the one we're compiling for.
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#
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# It's currently not possible to collect AFDO profiles on anything but
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# x86{,_64}.
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using_mismatched_sample_profile = current_cpu != "x64" && current_cpu != "x86"
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# Exclude unwind tables for official builds as unwinding can be done from
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# stack dumps produced by Crashpad at a later time "offline" in the crash
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# server. For unofficial (e.g. development) builds and non-Chrome branded
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# (e.g. Cronet which doesn't use Crashpad, crbug.com/479283) builds it's
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# useful to be able to unwind at runtime.
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exclude_unwind_tables = (is_chrome_branded && is_official_build) ||
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(is_chromecast && !is_cast_desktop_build && !is_debug)
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}
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assert(!is_cfi || use_thin_lto, "CFI requires ThinLTO")
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# If true, optimize for size. Does not affect windows builds.
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# Linux & Mac favor speed over size.
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# TODO(brettw) it's weird that Mac and desktop Linux are different. We should
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# explore favoring size over speed in this case as well.
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optimize_for_size = is_android || is_ios || is_fuchsia
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declare_args() {
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# Whether we should consider the profile we're using to be accurate. Accurate
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# profiles have the benefit of (potentially substantial) binary size
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# reductions, by instructing the compiler to optimize cold and uncovered
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# functions heavily for size. This often comes at the cost of performance.
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sample_profile_is_accurate = optimize_for_size
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}
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# Determine whether to enable or disable frame pointers, based on the platform
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# and build arguments.
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if (is_mac || is_ios || is_linux) {
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enable_frame_pointers = true
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} else if (is_win) {
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# 64-bit Windows ABI doesn't support frame pointers.
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if (current_cpu == "x64") {
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enable_frame_pointers = false
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} else {
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enable_frame_pointers = true
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}
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} else if (is_chromeos) {
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# ChromeOS generally prefers frame pointers, to support CWP.
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# However, Clang does not currently generate usable frame pointers in ARM
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# 32-bit builds (https://bugs.llvm.org/show_bug.cgi?id=18505) so disable them
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# there to avoid the unnecessary overhead.
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enable_frame_pointers = current_cpu != "arm"
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} else if (is_android) {
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enable_frame_pointers =
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enable_profiling ||
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# Ensure that stacks from arm64 crash dumps are usable (crbug.com/391706).
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current_cpu == "arm64" ||
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# For x86 Android, unwind tables are huge without frame pointers
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# (crbug.com/762629). Enabling frame pointers grows the code size slightly
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# but overall shrinks binaries considerably by avoiding huge unwind
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# tables.
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(current_cpu == "x86" && !exclude_unwind_tables && optimize_for_size) ||
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using_sanitizer
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} else {
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# Explicitly ask for frame pointers, otherwise:
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# * Stacks may be missing for sanitizer and profiling builds.
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# * Debug tcmalloc can crash (crbug.com/636489).
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enable_frame_pointers = using_sanitizer || enable_profiling || is_debug
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}
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# In general assume that if we have frame pointers then we can use them to
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# unwind the stack. However, this requires that they are enabled by default for
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# most translation units, that they are emitted correctly, and that the
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# compiler or platform provides a way to access them.
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can_unwind_with_frame_pointers = enable_frame_pointers
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if (current_cpu == "arm" && arm_use_thumb) {
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# We cannot currently unwind ARM Thumb frame pointers correctly.
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# See https://bugs.llvm.org/show_bug.cgi?id=18505
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can_unwind_with_frame_pointers = false
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} else if (is_win) {
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# Windows 32-bit does provide frame pointers, but the compiler does not
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# provide intrinsics to access them, so we don't use them.
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can_unwind_with_frame_pointers = false
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}
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assert(!can_unwind_with_frame_pointers || enable_frame_pointers)
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# Unwinding with CFI table is only possible on static library builds and
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# requried only when frame pointers are not enabled.
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can_unwind_with_cfi_table = is_android && !is_component_build &&
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!enable_frame_pointers && current_cpu == "arm"
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declare_args() {
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# Whether or not the official builds should be built with full WPO. Enabled by
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# default for the PGO and the x64 builds.
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if (chrome_pgo_phase > 0) {
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full_wpo_on_official = true
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} else {
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full_wpo_on_official = false
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}
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}
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declare_args() {
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# Set to true to use lld, the LLVM linker. This flag may be used on Windows,
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# Linux or Fuchsia.
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# TODO(pcc): Enable lld on more architectures on Linux. E.g. we probably need
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# to fix some of crbug.com/742655 to enable it on ARM.
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use_lld =
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is_clang &&
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(is_win || is_fuchsia || (use_thin_lto && target_os != "chromeos") ||
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(is_linux && current_cpu == "x64" && target_os != "chromeos") ||
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(is_android && (current_cpu != "arm" || arm_version >= 7) &&
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current_cpu != "mipsel" && current_cpu != "mips64el"))
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}
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declare_args() {
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# Whether to use the gold linker from binutils instead of lld or bfd.
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use_gold = !use_lld && !(is_chromecast && is_linux &&
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(current_cpu == "arm" || current_cpu == "mipsel")) &&
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((is_linux && (current_cpu == "x64" || current_cpu == "x86" ||
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current_cpu == "arm" || current_cpu == "mipsel" ||
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current_cpu == "mips64el")) ||
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(is_android && (current_cpu == "x86" || current_cpu == "x64" ||
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current_cpu == "arm" || current_cpu == "arm64")))
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}
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# If it wasn't manually set, set to an appropriate default.
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assert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level")
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if (symbol_level == -1) {
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if (is_android && use_order_profiling) {
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# With instrumentation enabled, debug info puts libchrome.so over 4gb, which
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# causes the linker to produce an invalid ELF. http://crbug.com/574476
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symbol_level = 0
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} else if (is_android && !is_component_build &&
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!(android_64bit_target_cpu && !build_apk_secondary_abi)) {
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# Reduce symbol level when it will cause invalid elf files to be created
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# (due to file size). https://crbug.com/648948.
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symbol_level = 1
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} else if (is_win && use_goma && !is_clang) {
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# goma doesn't support PDB files, so we disable symbols during goma
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# compilation because otherwise the redundant debug information generated
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# by visual studio (repeated in every .obj file) makes linker
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# memory consumption and link times unsustainable (crbug.com/630074).
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# Clang on windows does not have this issue.
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# If you use is_win_fastlink = true or lld or clang then you can set
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# symbol_level = 2 when using goma.
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symbol_level = 1
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} else if ((!is_nacl && !is_linux && !is_fuchsia) || is_debug ||
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is_official_build || is_chromecast) {
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# Linux builds slower by having symbols as part of the target binary,
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# whereas Mac and Windows have them separate, so in Release Linux, default
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# them off, but keep them on for Official builds and Chromecast builds.
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symbol_level = 2
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} else if (using_sanitizer) {
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# Sanitizers need line table info for stack traces. They don't need type
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# info or variable info, so we can leave that out to speed up the build.
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# Sanitizers also require symbols for filename suppressions to work.
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symbol_level = 1
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} else {
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symbol_level = 0
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}
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} else if (symbol_level == 2) {
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if (is_win) {
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# See crbug.com/630074
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assert(is_win_fastlink || use_lld || !use_goma || is_clang,
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"VC++ goma builds that use symbol_level 2 must use " +
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"is_win_fastlink or use_lld.")
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}
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}
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# Assert that the configuration isn't going to hit https://crbug.com/648948.
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# An exception is made when target_os == "chromeos" as we only use the Android
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# toolchain there to build relatively small binaries.
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assert(ignore_elf32_limitations || !is_android || target_os == "chromeos" ||
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(android_64bit_target_cpu && !build_apk_secondary_abi) ||
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is_component_build || symbol_level < 2,
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"Android 32-bit non-component builds cannot have symbol_level=2 " +
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"due to 4GiB file size limit, see https://crbug.com/648948. " +
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"If you really want to try this out, " +
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"set ignore_elf32_limitations=true.")
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