| # Copyright 2016 gRPC authors. |
| # |
| # 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. |
| """Patches the spawn() command for windows compilers. |
| |
| Windows has an 8191 character command line limit, but some compilers |
| support an @command_file directive where command_file is a file |
| containing the full command line. |
| """ |
| |
| from distutils import ccompiler |
| import os |
| import os.path |
| import shutil |
| import sys |
| import tempfile |
| |
| MAX_COMMAND_LENGTH = 8191 |
| |
| _classic_spawn = ccompiler.CCompiler.spawn |
| |
| |
| def _commandfile_spawn(self, command): |
| command_length = sum([len(arg) for arg in command]) |
| if os.name == 'nt' and command_length > MAX_COMMAND_LENGTH: |
| # Even if this command doesn't support the @command_file, it will |
| # fail as is so we try blindly |
| print('Command line length exceeded, using command file') |
| print(' '.join(command)) |
| temporary_directory = tempfile.mkdtemp() |
| command_filename = os.path.abspath( |
| os.path.join(temporary_directory, 'command')) |
| with open(command_filename, 'w') as command_file: |
| escaped_args = [ |
| '"' + arg.replace('\\', '\\\\') + '"' for arg in command[1:] |
| ] |
| command_file.write(' '.join(escaped_args)) |
| modified_command = command[:1] + ['@{}'.format(command_filename)] |
| try: |
| _classic_spawn(self, modified_command) |
| finally: |
| shutil.rmtree(temporary_directory) |
| else: |
| _classic_spawn(self, command) |
| |
| |
| def monkeypatch_spawn(): |
| """Monkeypatching is dumb, but it's either that or we become maintainers of |
| something much, much bigger.""" |
| ccompiler.CCompiler.spawn = _commandfile_spawn |