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# pylint: disable=g-bad-file-header
# Copyright 2016 The Bazel Authors. 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.
"""Wrapper script for executing the Microsoft Linker."""
import os
import re
import sys
import msvc_tools
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
sys.path.append(SCRIPT_DIR)
LINKPATTERNS = [
('-m(32|64)', ['$TARGET_ARCH']),
('-Xcompilation-mode=(dbg|fastbuild|opt)', ['$COMPILATION_MODE']),
(('rcs.*', '(.+)'), ['/OUT:"$PATH0"']),
(('-o', '(.+)'), ['/OUT:"$PATH0"']),
('-B(.+)', []),
('-lpthread', []),
('-L(.+)', ['/LIBPATH:$PATH0']),
('-static', []),
('-shared', ['/DLL']),
('-no-whole-archive', []),
('-rdynamic', []),
(r'-Wl,(.+)\.lib', ['$0.lib']),
('-Wl,@(.+)', ['$LOAD_PARAMS0']),
('@(.+)', ['$LOAD_PARAMS0']),
('-Wl,-rpath(.+)', []),
('-Wl,-S', []), # Debug symbols are in pdb files.
('-Wl,/SUBSYSTEM:(WINDOWS|CONSOLE)', ['/SUBSYSTEM:$0']),
(r'/WHOLEARCHIVE:(.+)\.lib', ['$0.lib']),
]
class MsvcLinker(msvc_tools.WindowsRunner):
"""Driver for the Microsoft linker."""
def Run(self, argv):
"""Runs the linker using the passed clang/gcc style argument list.
Args:
argv: List of arguments
Returns:
The return code of the link.
Raises:
ValueError: if target architecture or compile mode isn't specified
"""
# For now assume we are building a library.
tool = 'lib'
default_args = []
# Build argument list.
parser = msvc_tools.ArgParser(self, argv, LINKPATTERNS)
# Preprocessing arguments for linking whole archive libraries
parser.WholeArchivePreprocess()
# Find the output file name.
name = ''
for arg in parser.options:
if '/OUT:' in arg:
name = re.sub(r'^"|"$', '', arg[5:])
if not name:
raise msvc_tools.Error('No output file name specified!')
# Check if the library is empty, which is what happens when we create header
# or intermediate link-only libraries.
if (len(parser.options) == 2 and parser.options[0].startswith('/OUT') and
parser.options[1].startswith('/M')):
# Just "touch" the library to create the file.
with open(name, 'w'):
os.utime(name, None)
else:
# If the output name ends in .lo, or .a, it is a library, otherwise
# we need to use link to create an executable.
if os.path.splitext(name)[1] not in ['.a', '.lo']:
tool = 'link'
# If there is no .o on the command line, then we need to add the
# run-time library for the target. Without this the linker gives a
# LNK4001 error and cannot find an entry point.
for arg in parser.options:
if arg.endswith('.o'):
break
else:
if not parser.compilation_mode:
raise ValueError('Must specify compilation mode '
'(-Xcompilation-mode={dbg,fastbuild,opt})')
rtlib = 'libcmt%s.lib'
# attempt to choose the right runtime library if we can
for opt in reversed(parser.options):
if opt in ['/MT', '/MTd']:
rtlib = 'msvcrt%s.lib'
break
default_args.insert(0, rtlib %
('d' if parser.compilation_mode == 'dbg' else ''))
return self.RunBinary(tool, default_args + parser.options, parser)
def main(argv):
return MsvcLinker().Run(argv[1:])
if __name__ == '__main__':
sys.exit(main(sys.argv[1:])) # need to skip the first argument
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