build/config/mac/BUILD.gn

# 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/apple/symbols.gni")
import("//build/config/c++/c++.gni")
import("//build/config/mac/mac_sdk.gni")
import("//build/config/sysroot.gni")

# This is included by reference in the //build/config/compiler config that
# is applied to all targets. It is here to separate out the logic.
config("compiler") {
  # These flags are shared between the C compiler and linker.
  common_mac_flags = []

  # CPU architecture.
  if (current_cpu == "x64") {
    clang_arch = "x86_64"
  } else if (current_cpu == "x86") {
    clang_arch = "i386"
  } else if (current_cpu == "arm64") {
    clang_arch = current_cpu
  } else {
    assert(false, "unknown current_cpu $current_cpu")
  }
  if (host_os == "mac") {
    common_mac_flags += [
      "-arch",
      clang_arch,
    ]
  } else {
    common_mac_flags += [ "--target=$clang_arch-apple-macos" ]
  }

  # This is here so that all files get recompiled after an Xcode update.
  # (defines are passed via the command line, and build system rebuild things
  # when their commandline changes). Nothing should ever read this define.
  defines = [ "CR_XCODE_VERSION=$xcode_version" ]

  asmflags = common_mac_flags
  cflags = common_mac_flags

  # Without this, the constructors and destructors of a C++ object inside
  # an Objective C struct won't be called, which is very bad.
  cflags_objcc = [ "-fobjc-call-cxx-cdtors" ]

  ldflags = common_mac_flags

  if (save_unstripped_output) {
    ldflags += [ "-Wcrl,unstripped," + rebase_path(root_out_dir) ]
  }

  if (export_libcxxabi_from_executables) {
    ldflags += [ "-Wl,-undefined,dynamic_lookup" ]
  }
}

# This is included by reference in the //build/config/compiler:runtime_library
# config that is applied to all targets. It is here to separate out the logic
# that is Mac-only. Please see that target for advice on what should go in
# :runtime_library vs. :compiler.
config("runtime_library") {
  common_flags = [
    "-isysroot",
    rebase_path(sysroot, root_build_dir),
    "-mmacosx-version-min=$mac_deployment_target",
  ]

  asmflags = common_flags
  cflags = common_flags
  ldflags = common_flags

  # Prevent Mac OS X AssertMacros.h (included by system header) from defining
  # macros that collide with common names, like 'check', 'require', and
  # 'verify'.
  # http://opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/AssertMacros.h
  defines = [ "__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=0" ]
}

# On Mac, this is used for everything except static libraries.
config("mac_dynamic_flags") {
  ldflags = [ "-Wl,-ObjC" ]  # Always load Objective-C categories and classes.

  if (is_component_build) {
    ldflags += [
      # Path for loading shared libraries for unbundled binaries.
      "-Wl,-rpath,@loader_path/.",

      # Path for loading shared libraries for bundled binaries. Get back from
      # Binary.app/Contents/MacOS.
      "-Wl,-rpath,@loader_path/../../..",
    ]
  }
}

# The ldflags referenced below are handled by
# //build/toolchain/apple/linker_driver.py.
# Remove this config if a target wishes to change the arguments passed to the
# strip command during linking. This config by default strips all symbols
# from a binary, but some targets may wish to specify an exports file to
# preserve specific symbols.
config("strip_all") {
  if (enable_stripping) {
    ldflags = [ "-Wcrl,strip,-x,-S" ]
  }
}

# When building with Goma, all inputs must be relative to the build directory.
# If using the system Xcode, which typically resides outside the build root, a
# symlink to the SDK is created in the build directory, and the path to that
# link is stored in $mac_sdk_path. If an action references a file in the SDK as
# an input, GN will complain that no target generates the file because it is
# below the $root_build_dir. The below action lists as outputs the files in the
# SDK that are referenced as inputs to actions, so that GN thinks a target has
# generated them. The list is centralized here, as multiple targets need to
# reference the same files, and an output can only be generated once.
#
# The symbolic link for $mac_sdk_path is set up by
# //build/config/apple/sdk_info.py in //build/config/mac/mac_sdk.gni.
if (use_system_xcode && use_goma && target_os == "mac") {
  action("sdk_inputs") {
    script = "//build/noop.py"
    outputs = [
      "$mac_sdk_path/usr/include/mach/exc.defs",
      "$mac_sdk_path/usr/include/mach/mach_exc.defs",
      "$mac_sdk_path/usr/include/mach/notify.defs",
    ]
  }
} else {
  group("sdk_inputs") {
  }
}