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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 warnings about duplicate CU entries (https://crbug.com/1264130)
- dwp_proc = subprocess.Popen(wrapper_utils.CommandToRun(
- [args.dwp, '-e', exe_file, '-o', exe_file + '.dwp']),
- stderr=subprocess.DEVNULL)
- # 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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