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response_file.py
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127 lines (98 loc) · 4.4 KB
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# Copyright 2013 The Emscripten Authors. All rights reserved.
# Emscripten is available under two separate licenses, the MIT license and the
# University of Illinois/NCSA Open Source License. Both these licenses can be
# found in the LICENSE file.
import logging
import os
import shlex
import tempfile
from .utils import WINDOWS
DEBUG = int(os.environ.get('EMCC_DEBUG', '0'))
def create_response_file(args, directory, suffix='.rsp.utf-8'):
"""Routes the given cmdline param list in args into a new response file and
returns the filename to it.
By default the returned filename has a suffix '.rsp.utf-8'. Pass a suffix parameter to override.
"""
assert suffix.startswith('.')
response_fd, response_filename = tempfile.mkstemp(prefix='emscripten_', suffix=suffix, dir=directory, text=True)
# Backslashes and other special chars need to be escaped in the response file.
escape_chars = ['\\', '\"']
# When calling llvm-ar on Linux and macOS, single quote characters ' should be escaped.
if not WINDOWS:
escape_chars += ['\'']
def escape(arg):
for char in escape_chars:
arg = arg.replace(char, '\\' + char)
return arg
args = [escape(a) for a in args]
contents = ""
# Arguments containing spaces need to be quoted.
for arg in args:
if ' ' in arg:
arg = '"%s"' % arg
contents += arg + '\n'
# Decide the encoding of the generated file based on the requested file suffix
if suffix.count('.') == 2:
# Use the encoding specified in the suffix of the response file
encoding = suffix.split('.')[2]
else:
encoding = 'utf-8'
with os.fdopen(response_fd, 'w', encoding=encoding) as f:
f.write(contents)
if DEBUG:
logging.warning('Creating response file ' + response_filename + ' with following contents: ' + contents)
# Register the created .rsp file to be automatically cleaned up once this
# process finishes, so that caller does not have to remember to do it.
from . import shared
shared.get_temp_files().note(response_filename)
return response_filename
def read_response_file(response_filename):
"""Reads a response file, and returns the list of cmdline params found in the
file.
The encoding that the response filename should be read with can be specified
as a suffix to the file, e.g. "foo.rsp.utf-8" or "foo.rsp.cp1252". If not
specified, first UTF-8 and then Python locale.getpreferredencoding() are
attempted.
The parameter response_filename may start with '@'."""
if response_filename.startswith('@'):
response_filename = response_filename[1:]
if not os.path.exists(response_filename):
raise IOError("response file not found: %s" % response_filename)
# Guess encoding based on the file suffix
components = os.path.basename(response_filename).split('.')
encoding_suffix = components[-1].lower()
if len(components) > 1 and (encoding_suffix.startswith('utf') or encoding_suffix.startswith('cp') or encoding_suffix.startswith('iso') or encoding_suffix in ['ascii', 'latin-1']):
guessed_encoding = encoding_suffix
else:
# On windows, recent version of CMake emit rsp files containing
# a BOM. Using 'utf-8-sig' works on files both with and without
# a BOM.
guessed_encoding = 'utf-8-sig'
try:
# First try with the guessed encoding
with open(response_filename, encoding=guessed_encoding) as f:
args = f.read()
except (ValueError, LookupError): # UnicodeDecodeError is a subclass of ValueError, and Python raises either a ValueError or a UnicodeDecodeError on decode errors. LookupError is raised if guessed encoding is not an encoding.
if DEBUG:
logging.warning(f'Failed to parse response file {response_filename} with guessed encoding "{guessed_encoding}". Trying default system encoding...')
# If that fails, try with the Python default locale.getpreferredencoding()
with open(response_filename) as f:
args = f.read()
args = shlex.split(args)
if DEBUG:
logging.warning('Read response file ' + response_filename + ': ' + str(args))
return args
def substitute_response_files(args):
"""Substitute any response files found in args with their contents."""
new_args = []
for arg in args:
if arg.startswith('@'):
new_args += read_response_file(arg)
elif arg.startswith('-Wl,@'):
for a in read_response_file(arg[5:]):
if a.startswith('-'):
a = '-Wl,' + a
new_args.append(a)
else:
new_args.append(arg)
return new_args