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- # Copyright 2015 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- import("//build/config/c++/c++.gni")
- import("//build/config/sanitizers/sanitizers.gni")
- import("//build/toolchain/toolchain.gni")
- # Used by libc++ and libc++abi.
- config("config") {
- cflags = [ "-fstrict-aliasing" ]
- if (is_win) {
- cflags += [
- # libc++ wants to redefine the macros WIN32_LEAN_AND_MEAN and _CRT_RAND_S
- # in its implementation.
- "-Wno-macro-redefined",
- ]
- cflags_cc = [
- # We want to use a uniform C++ version across all of chromium, but
- # upstream libc++ requires C++20 so we have to make an exception here.
- # No other target should override the default -std= flag.
- "-std:c++20",
- ]
- } else {
- cflags += [ "-fPIC" ]
- cflags_cc = [ "-std=c++20" ]
- }
- defines = [ "_LIBCPP_BUILDING_LIBRARY" ]
- }
- # Explicitly set version macros to Windows 7 to prevent libc++ from adding a
- # hard dependency on GetSystemTimePreciseAsFileTime, which was introduced in
- # Windows 8.
- config("winver") {
- defines = [
- "NTDDI_VERSION=NTDDI_WIN7",
- "_WIN32_WINNT=_WIN32_WINNT_WIN7",
- "WINVER=_WIN32_WINNT_WIN7",
- ]
- }
- if (libcxx_is_shared) {
- _libcxx_target_type = "shared_library"
- } else {
- _libcxx_target_type = "source_set"
- }
- target(_libcxx_target_type, "libc++") {
- # Most things that need to depend on libc++ should do so via the implicit
- # 'common_deps' dependency below. Some targets that package libc++.so may
- # need to explicitly depend on libc++.
- visibility = [
- "//build/config:common_deps",
- "//third_party/catapult/devil:devil",
- ]
- if (is_linux) {
- # This target packages libc++.so, so must have an explicit dependency on
- # libc++.
- visibility +=
- [ "//remoting/host/linux:remoting_me2me_host_copy_user_session" ]
- }
- if (libcxx_is_shared) {
- no_default_deps = true
- }
- if (is_linux && !is_clang) {
- libs = [ "atomic" ]
- }
- inputs = [ "__config_site" ]
- sources = [
- "trunk/src/algorithm.cpp",
- "trunk/src/any.cpp",
- "trunk/src/atomic.cpp",
- "trunk/src/barrier.cpp",
- "trunk/src/bind.cpp",
- "trunk/src/charconv.cpp",
- "trunk/src/chrono.cpp",
- "trunk/src/condition_variable.cpp",
- "trunk/src/condition_variable_destructor.cpp",
- "trunk/src/debug.cpp",
- "trunk/src/exception.cpp",
- "trunk/src/format.cpp",
- "trunk/src/functional.cpp",
- "trunk/src/future.cpp",
- "trunk/src/hash.cpp",
- "trunk/src/ios.cpp",
- "trunk/src/ios.instantiations.cpp",
- "trunk/src/iostream.cpp",
- "trunk/src/legacy_debug_handler.cpp",
- "trunk/src/legacy_pointer_safety.cpp",
- "trunk/src/locale.cpp",
- "trunk/src/memory.cpp",
- "trunk/src/mutex.cpp",
- "trunk/src/mutex_destructor.cpp",
- "trunk/src/new.cpp",
- "trunk/src/optional.cpp",
- "trunk/src/random.cpp",
- "trunk/src/random_shuffle.cpp",
- "trunk/src/regex.cpp",
- "trunk/src/ryu/d2fixed.cpp",
- "trunk/src/ryu/d2s.cpp",
- "trunk/src/ryu/f2s.cpp",
- "trunk/src/shared_mutex.cpp",
- "trunk/src/stdexcept.cpp",
- "trunk/src/string.cpp",
- "trunk/src/strstream.cpp",
- "trunk/src/system_error.cpp",
- "trunk/src/thread.cpp",
- "trunk/src/typeinfo.cpp",
- "trunk/src/utility.cpp",
- "trunk/src/valarray.cpp",
- "trunk/src/variant.cpp",
- "trunk/src/vector.cpp",
- "trunk/src/verbose_abort.cpp",
- ]
- include_dirs = [ "trunk/src" ]
- if (is_win) {
- sources += [
- "trunk/src/support/win32/locale_win32.cpp",
- "trunk/src/support/win32/support.cpp",
- "trunk/src/support/win32/thread_win32.cpp",
- ]
- configs -= [ "//build/config/win:winver" ]
- configs += [ ":winver" ]
- if (libcxx_natvis_include) {
- inputs += [
- # libc++.natvis listed as an input here instead of in
- # //build/config/c++:runtime_library to prevent unnecessary size
- # increase in generated build files.
- "//build/config/c++/libc++.natvis",
- ]
- }
- }
- configs -= [
- "//build/config/compiler:chromium_code",
- "//build/config/compiler:no_exceptions",
- "//build/config/compiler:no_rtti",
- "//build/config/coverage:default_coverage",
- ]
- if ((is_android || is_apple) && libcxx_is_shared) {
- # Use libc++_chrome to avoid conflicting with system libc++
- output_name = "libc++_chrome"
- if (is_android) {
- # See crbug.com/1076244#c11 for more detail.
- configs -= [ "//build/config/android:hide_all_but_jni_onload" ]
- }
- }
- configs += [
- ":config",
- "//build/config/compiler:no_chromium_code",
- "//build/config/compiler:exceptions",
- "//build/config/compiler:rtti",
- ]
- if (libcxx_is_shared && !is_win) {
- configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
- configs += [ "//build/config/gcc:symbol_visibility_default" ]
- }
- defines = []
- if (!libcxx_is_shared) {
- if (is_apple && is_clang) {
- # We want operator new/delete to be private on Mac, but these functions
- # are implicitly created by the compiler for each translation unit, as
- # specified in the C++ spec 3.7.4p2, which makes them always have default
- # visibility. This option is needed to force hidden visibility since
- # -fvisibility=hidden doesn't have the desired effect.
- cflags = [ "-fvisibility-global-new-delete-hidden" ]
- } else {
- defines += [
- # This resets the visibility to default only for the various
- # flavors of operator new and operator delete. These symbols
- # are weak and get overriden by Chromium-provided ones, but if
- # these symbols had hidden visibility, this would make the
- # Chromium symbols hidden too because elf visibility rules
- # require that linkers use the least visible form when merging,
- # and if this is hidden, then when we merge it with tcmalloc's
- # operator new, hidden visibility would win. However, tcmalloc
- # needs a visible operator new to also override operator new
- # references from system libraries.
- # TODO(lld): Ask lld for a --force-public-visibility flag or
- # similar to that overrides the default elf merging rules, and
- # make tcmalloc's gn config pass that to all its dependencies,
- # then remove this override here.
- "_LIBCPP_OVERRIDABLE_FUNC_VIS=__attribute__((__visibility__(\"default\")))",
- ]
- }
- }
- if (!is_apple && (is_asan || is_tsan || is_msan)) {
- # In {a,t,m}san configurations, operator new and operator delete will be
- # provided by the sanitizer runtime library. Since libc++ defines these
- # symbols with weak linkage, and the *san runtime uses strong linkage, it
- # should technically be OK to omit this, but it's added to be explicit.
- defines += [ "_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS" ]
- }
- if (!is_win) {
- defines += [ "LIBCXX_BUILDING_LIBCXXABI" ]
- if (!export_libcxxabi_from_executables) {
- deps = [ "//buildtools/third_party/libc++abi" ]
- }
- }
- }
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