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#!/usr/bin/env python
# Copyright 2014 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.
# This file isn't officially supported by the Chromium project. It's maintained
# on a best-effort basis by volunteers, so some things may be broken from time
# to time. If you encounter errors, it's most often due to files in base that
# have been added or moved since somebody last tried this script. Generally
# such errors are easy to diagnose.
"""Builds gn and generates Chromium's build files.
This script should only be run from a Chromium tarball. It will not work in a
regular git checkout. In a regular git checkout, a gn binary is pulled via
DEPS. To build gn from source in a regular checkout, see
https://gn.googlesource.com/gn/
"""
# This script may be removed if/when gn becomes available in the standard
# repositories for several mainstream Linux distributions.
import optparse
import os
import shutil
import subprocess
import sys
BOOTSTRAP_DIR = os.path.dirname(os.path.abspath(__file__))
GN_ROOT = os.path.dirname(BOOTSTRAP_DIR)
SRC_ROOT = os.path.dirname(os.path.dirname(GN_ROOT))
def main(argv):
parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
parser.add_option(
'-d',
'--debug',
action='store_true',
help='Do a debug build. Defaults to release build.')
parser.add_option(
'-o', '--output', help='place output in PATH', metavar='PATH')
parser.add_option('-s', '--no-rebuild', help='ignored')
parser.add_option('--no-clean', help='ignored')
parser.add_option('--gn-gen-args', help='Args to pass to gn gen --args')
parser.add_option(
'--build-path',
help='The directory in which to build gn, '
'relative to the src directory. (eg. out/Release)')
parser.add_option('-v', '--verbose', help='ignored')
parser.add_option(
'--skip-generate-buildfiles',
action='store_true',
help='Do not run GN after building it. Causes --gn-gen-args '
'to have no effect.')
parser.add_option(
'--use-custom-libcxx',
action='store_true',
help='Build with in-tree libc++. This may be necessary if the system '
'libstdc++ does not support C++14 features.')
options, args = parser.parse_args(argv)
if args:
parser.error('Unrecognized command line arguments: %s.' % ', '.join(args))
if options.build_path:
build_rel = options.build_path
elif options.debug:
build_rel = os.path.join('out', 'Debug')
else:
build_rel = os.path.join('out', 'Release')
out_dir = os.path.join(SRC_ROOT, build_rel)
gn_path = options.output or os.path.join(out_dir, 'gn')
gn_build_dir = os.path.join(out_dir, 'gn_build')
ninja_binary = os.environ.get('NINJA', 'ninja')
# TODO(thomasanderson): Remove this once Ubuntu Trusty reaches EOL, or when
# Chromium's infrastructure is upgraded from Trusty to Xenial, whichever comes
# second ideally. This can be done by reverting this CL:
# https://chromium-review.googlesource.com/c/chromium/src/+/1460187/
if options.use_custom_libcxx:
libcxx_dir = os.path.join(gn_build_dir, 'libc++')
if not os.path.exists(libcxx_dir):
os.makedirs(libcxx_dir)
shutil.copy2(
os.path.join(BOOTSTRAP_DIR, 'libc++.ninja'),
os.path.join(libcxx_dir, 'build.ninja'))
with open(os.path.join(libcxx_dir, 'toolchain.ninja'), 'w') as f:
f.write('\n'.join([
'cxx = ' + os.environ.get('CXX', 'clang++'),
'ar = ' + os.environ.get('AR', 'ar'),
'cxxflags = ' + ' '.join(
os.environ.get('CFLAGS', '').split() +
os.environ.get('CXXFLAGS', '').split()),
]) + '\n')
subprocess.check_call([ninja_binary, '-C', libcxx_dir])
shutil.copy2(os.path.join(gn_build_dir, 'libc++.gn.so'), out_dir)
def append_to_env(var, vals):
os.putenv(var, os.environ.get(var, '') + ' ' + ' '.join(vals))
append_to_env('LDFLAGS', [
'-nodefaultlibs', 'libc++.gn.so',
'-lpthread', '-lc', '-lm',
'-Wl,-rpath="\$$ORIGIN/."', '-Wl,-rpath-link=.'
])
append_to_env('CXXFLAGS', [
'-nostdinc++',
' -isystem../../../buildtools/third_party/libc++/trunk/include',
'-isystem../../../buildtools/third_party/libc++abi/trunk/include'
])
cmd = [
sys.executable,
os.path.join(GN_ROOT, 'build', 'gen.py'),
'--no-last-commit-position',
'--out-path=' + gn_build_dir,
]
if options.debug:
cmd.append('--debug')
subprocess.check_call(cmd)
shutil.copy2(
os.path.join(BOOTSTRAP_DIR, 'last_commit_position.h'), gn_build_dir)
subprocess.check_call(
[ninja_binary, '-C', gn_build_dir, '-w', 'dupbuild=err', 'gn'])
shutil.copy2(os.path.join(gn_build_dir, 'gn'), gn_path)
if not options.skip_generate_buildfiles:
gn_gen_args = options.gn_gen_args or ''
if not options.debug:
gn_gen_args += ' is_debug=false'
subprocess.check_call([
gn_path, 'gen', out_dir,
'--args=%s' % gn_gen_args, "--root=" + SRC_ROOT
])
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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