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#!/usr/bin/env python
# Copyright 2015 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.
"""Runs a linking command and optionally a strip command.
This script exists to avoid using complex shell commands in
gcc_toolchain.gni's tool("link"), in case the host running the compiler
does not have a POSIX-like shell (e.g. Windows).
"""
import argparse
import os
import subprocess
import sys
import wrapper_utils
# When running on a Windows host and using a toolchain whose tools are
# actually wrapper scripts (i.e. .bat files on Windows) rather than binary
# executables, the "command" to run has to be prefixed with this magic.
# The GN toolchain definitions take care of that for when GN/Ninja is
# running the tool directly. When that command is passed in to this
# script, it appears as a unitary string but needs to be split up so that
# just 'cmd' is the actual command given to Python's subprocess module.
BAT_PREFIX = 'cmd /c call '
def CommandToRun(command):
if command[0].startswith(BAT_PREFIX):
command = command[0].split(None, 3) + command[1:]
return command
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--strip',
help='The strip binary to run',
metavar='PATH')
parser.add_argument('--unstripped-file',
help='Executable file produced by linking command',
metavar='FILE')
parser.add_argument('--map-file',
help=('Use --Wl,-Map to generate a map file. Will be '
'gzipped if extension ends with .gz'),
metavar='FILE')
parser.add_argument('--dwp', help=('The dwp binary to run'), metavar='FILE')
parser.add_argument('--output',
required=True,
help='Final output executable file',
metavar='FILE')
parser.add_argument('command', nargs='+',
help='Linking command')
args = parser.parse_args()
# Work-around for gold being slow-by-default. http://crbug.com/632230
fast_env = dict(os.environ)
fast_env['LC_ALL'] = 'C'
result = wrapper_utils.RunLinkWithOptionalMapFile(args.command, env=fast_env,
map_file=args.map_file)
if result != 0:
return result
# If dwp is set, then package debug info for this exe.
dwp_proc = None
if args.dwp:
exe_file = args.output
if args.unstripped_file:
exe_file = args.unstripped_file
# Suppress output here because it doesn't seem to be useful. The most
# common error is a segfault, which will happen if files are missing.
with open(os.devnull, "w") as devnull:
dwp_proc = subprocess.Popen(wrapper_utils.CommandToRun(
[args.dwp, '-e', exe_file, '-o', exe_file + '.dwp']),
stdout=devnull,
stderr=subprocess.STDOUT)
# Finally, strip the linked executable (if desired).
if args.strip:
result = subprocess.call(
CommandToRun([args.strip, '-o', args.output, args.unstripped_file]))
if dwp_proc:
dwp_result = dwp_proc.wait()
if dwp_result != 0:
sys.stderr.write('dwp failed with error code {}\n'.format(dwp_result))
return dwp_result
return result
if __name__ == "__main__":
sys.exit(main())
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