build_overrides/build.gni

# Copyright 2022 The Dawn Authors
#
# 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() {
  # Tell Dawn and dependencies to not do Chromium-specific things
  build_with_chromium = false

  # In standalone Dawn builds, don't try to use the hermetic install of Xcode
  # that Chromium uses
  use_system_xcode = ""

  # Android 32-bit non-component, non-clang builds cannot have symbol_level=2
  # due to 4GiB file size limit, see https://crbug.com/648948.
  ignore_elf32_limitations = false
}

# Enables assertions on safety checks in libc++.
enable_safe_libcxx = true

# Use C++17 instead of C++20 in MSVC builds
# TODO(crbug.com/dawn/1881): Fix upstream DXC build on MSVC with C++20 enabled,
# then remove this flag.
msvc_use_cxx17 = true

# Detect whether we can use the hermetic XCode like in Chromium and do so if
# possible.
if (host_os == "mac" && use_system_xcode == "") {
  _result = exec_script("//build/mac/should_use_hermetic_xcode.py",
                        [ target_os ],
                        "value")

  assert(_result != 2,
         "Do not allow building targets with the default" +
             "hermetic toolchain if the minimum OS version is not met.")
  assert(_result != 3,
         "iOS does not support building with a hermetic toolchain. " +
             "Please install Xcode.")

  use_system_xcode = _result != 1
}