gn/standalone/BUILDCONFIG.gn

# Copyright (C) 2017 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

declare_args() {
  is_debug = true
  is_clang = true
  is_system_compiler = false
  is_lto = false

  # This is defined here because it's needed below for determining the value of
  # |is_cross_compiling|.
  target_triplet = ""
}

# Platform detection
if (target_os == "") {
  target_os = host_os
}
if (current_os == "") {
  current_os = target_os
}

is_android = current_os == "android"
is_chromeos = current_os == "chromeos"
is_linux = current_os == "linux"
is_linux_host = host_os == "linux"
is_mac = current_os == "mac"
is_mac_host = host_os == "mac"
is_win = current_os == "win"
is_win_host = host_os == "win"

# Building with Windows/Fuchsia/nacl is currently only supported in the Chromium
# tree so always set this to false.
is_fuchsia = false
is_nacl = false

if (target_cpu == "") {
  target_cpu = host_cpu
  if (is_android) {
    target_cpu = "arm"
  }
}
if (current_cpu == "") {
  current_cpu = target_cpu
}

declare_args() {
  # the ossfuzz sanitizer overrides this to true. In that config the
  # host/target cpu and arch are identical, but we want to build only the
  # targets with the sanitizer/fuzzer flags
  is_cross_compiling =
      target_cpu != host_cpu || target_os != host_os || target_triplet != ""
}
default_configs = [
  "//gn/standalone:default",
  "//gn/standalone:extra_warnings",
  "//gn/standalone:no_exceptions",
  "//gn/standalone:no_rtti",
  "//gn/standalone:visibility_hidden",
  "//gn/standalone/libc++:config",
  "//gn/standalone/sanitizers:sanitizers_cflags",
  "//gn/standalone:c++17",
]

if (is_debug) {
  default_configs += [ "//gn/standalone:debug_noopt" ]
} else {
  default_configs += [ "//gn/standalone:release" ]
}

if (is_win) {
  default_configs += [ "//gn/standalone:win32_lean_and_mean" ]
}

set_defaults("source_set") {
  configs = default_configs
}

set_defaults("static_library") {
  configs = default_configs
}

# Realistically the only shared_library that we build right now is libc++.so
# when use_custom_libcxx=true (on Linux). Hence don't add a dependency on
# libc++ itself on these targets.
set_defaults("shared_library") {
  configs = default_configs
  configs += [ "//gn/standalone:shared_library" ]

  # note: the following is not a nested config to be removable.
  configs += [ "//gn/standalone:android_liblog" ]
}

set_defaults("executable") {
  configs = default_configs
  configs += [ "//gn/standalone:executable" ]

  # note: the following is not a nested config to be removable.
  configs += [ "//gn/standalone:android_liblog" ]
}

if (is_win) {
  _default_toolchain = "//gn/standalone/toolchain:msvc"
} else {
  _default_toolchain = "//gn/standalone/toolchain:gcc_like"
}
set_default_toolchain(_default_toolchain)

if (is_cross_compiling) {
  host_toolchain = "//gn/standalone/toolchain:gcc_like_host"
} else {
  host_toolchain = _default_toolchain
}