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#!/usr/bin/env python
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Fixup GCC-generated dependency files.
Modify GCC generated dependency files in-place so they are more suitable
for including in a GNU Makefile. Without the fixups, deleting or renaming
headers can cause the build to be broken. See:
http://mad-scientist.net/make/autodep.html for more details of the problem.
"""
import os
import optparse
import sys
TAG_LINE = '# Updated by fix_deps.py\n'
class Error(Exception):
pass
def ParseLine(line, new_target):
"""Parse one line of a GCC-generated deps file.
Each line contains an optional target and then a list
of space seperated dependencies. Spaces within filenames
are escaped with a backslash.
"""
filenames = []
if new_target and ':' in line:
line = line.split(':', 1)[1]
line = line.strip()
line = line.rstrip('\\')
while True:
# Find the next non-escaped space
line = line.strip()
pos = line.find(' ')
while pos > 0 and line[pos-1] == '\\':
pos = line.find(' ', pos+1)
if pos == -1:
filenames.append(line)
break
filenames.append(line[:pos])
line = line[pos+1:]
return filenames
def FixupDepFile(filename):
if not os.path.exists(filename):
raise Error('File not found: %s' % filename)
outlines = [TAG_LINE]
deps = []
new_target = True
with open(filename) as infile:
for line in infile:
if line == TAG_LINE:
raise Error('Already processed: %s' % filename)
outlines.append(line)
deps += ParseLine(line, new_target)
new_target = line.endswith('\\')
# For every depenency found output a dummy target with no rules
for dep in deps:
outlines.append('%s:\n' % dep)
with open(filename, 'w') as outfile:
for line in outlines:
outfile.write(line)
def main(argv):
usage = "usage: %prog [options] <dep_file ...>"
parser = optparse.OptionParser(usage=usage, description=__doc__)
args = parser.parse_args(argv)[1]
if not args:
raise parser.error('expected one or more files as arguments')
for arg in args:
FixupDepFile(arg)
if __name__ == '__main__':
try:
sys.exit(main(sys.argv[1:]))
except Error as e:
sys.stderr.write('%s: %s\n' % (os.path.basename(__file__), e))
sys.exit(1)
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