src/starboard/build/toolchain/concurrent_links.gni

# Copyright 2016 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.

# Modifications Copyright 2017 Google Inc. All Rights Reserved.
#
# 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.

# This file should only be imported from files that define toolchains.
# There's no way to enforce this exactly, but all toolchains are processed
# in the context of the default_toolchain, so we can at least check for that.
assert(current_toolchain == default_toolchain)

declare_args() {
  # Limit the number of concurrent links; we often want to run fewer
  # links at once than we do compiles, because linking is memory-intensive.
  # The default to use varies by platform and by the amount of memory
  # available, so we call out to a script to get the right value.
  concurrent_links = -1
}

if (concurrent_links == -1) {
  if (host_os == "win") {
    _args = [ "--mem_per_link_gb=5" ]
  } else if (host_os == "mac") {
    _args = [ "--mem_per_link_gb=4" ]
  }
  else {
    _args = []
  }

  # TODO(crbug.com/617429) Pass more build configuration info to the script
  # so that we can compute better values.
  concurrent_links = exec_script("get_concurrent_links.py", _args, "value")
}