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# 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
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