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108 lines
2.8 KiB
108 lines
2.8 KiB
9 years ago
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#!/usr/bin/env python
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# Copyright (c) 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Fixup GCC-generated dependency files.
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Modify GCC generated dependency files so they are more suitable for including
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in a GNU Makefile. Without the fixups, deleting or renaming headers can cause
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the build to be broken.
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See http://mad-scientist.net/make/autodep.html for more details of the problem.
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"""
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import argparse
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import os
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import sys
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TAG_LINE = '# Updated by fix_deps.py\n'
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class Error(Exception):
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pass
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def ParseLine(line, new_target):
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"""Parse one line of a GCC-generated deps file.
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Each line contains an optional target and then a list
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of space seperated dependencies. Spaces within filenames
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are escaped with a backslash.
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"""
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filenames = []
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if new_target and ':' in line:
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line = line.split(':', 1)[1]
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line = line.strip()
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line = line.rstrip('\\')
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while True:
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# Find the next non-escaped space
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line = line.strip()
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pos = line.find(' ')
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while pos > 0 and line[pos-1] == '\\':
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pos = line.find(' ', pos+1)
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if pos == -1:
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filenames.append(line)
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break
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filenames.append(line[:pos])
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line = line[pos+1:]
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return filenames
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def FixupDepFile(filename, output_filename=None):
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if not os.path.exists(filename):
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raise Error('File not found: %s' % filename)
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if output_filename is None:
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output_filename = filename
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outlines = [TAG_LINE]
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deps = []
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new_target = True
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with open(filename) as infile:
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for line in infile:
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if line == TAG_LINE:
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raise Error('Already processed: %s' % filename)
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outlines.append(line)
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deps += ParseLine(line, new_target)
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new_target = line.endswith('\\')
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# For every depenency found output a dummy target with no rules
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for dep in deps:
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outlines.append('%s:\n' % dep)
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with open(output_filename, 'w') as outfile:
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for line in outlines:
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outfile.write(line)
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def main(argv):
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('-o', '--output', help='Output filename (defaults to '
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'input name with .deps extension')
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parser.add_argument('-c', '--clean', action='store_true',
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help='Remove input file after writing output')
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parser.add_argument('dep_file')
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options = parser.parse_args(argv)
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output_filename = options.output
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if not output_filename:
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output_filename = os.path.splitext(options.dep_file)[0] + '.deps'
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FixupDepFile(options.dep_file, output_filename)
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if options.clean and options.dep_file != output_filename:
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os.remove(options.dep_file)
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return 0
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if __name__ == '__main__':
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try:
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sys.exit(main(sys.argv[1:]))
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except Error as e:
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sys.stderr.write('%s: %s\n' % (os.path.basename(__file__), e))
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sys.exit(1)
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