1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/build/subconfigure.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,137 @@
1.4 +# This Source Code Form is subject to the terms of the Mozilla Public
1.5 +# License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 +# file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.7 +
1.8 +# This script is used to capture the content of config.status-generated
1.9 +# files and subsequently restore their timestamp if they haven't changed.
1.10 +
1.11 +import os
1.12 +import re
1.13 +import subprocess
1.14 +import sys
1.15 +import pickle
1.16 +
1.17 +class File(object):
1.18 + def __init__(self, path):
1.19 + self._path = path
1.20 + self._content = open(path, 'rb').read()
1.21 + stat = os.stat(path)
1.22 + self._times = (stat.st_atime, stat.st_mtime)
1.23 +
1.24 + @property
1.25 + def path(self):
1.26 + return self._path
1.27 +
1.28 + @property
1.29 + def mtime(self):
1.30 + return self._times[1]
1.31 +
1.32 + def update_time(self):
1.33 + '''If the file hasn't changed since the instance was created,
1.34 + restore its old modification time.'''
1.35 + if not os.path.exists(self._path):
1.36 + return
1.37 + if open(self._path, 'rb').read() == self._content:
1.38 + os.utime(self._path, self._times)
1.39 +
1.40 +
1.41 +# As defined in the various sub-configures in the tree
1.42 +PRECIOUS_VARS = set([
1.43 + 'build_alias',
1.44 + 'host_alias',
1.45 + 'target_alias',
1.46 + 'CC',
1.47 + 'CFLAGS',
1.48 + 'LDFLAGS',
1.49 + 'LIBS',
1.50 + 'CPPFLAGS',
1.51 + 'CPP',
1.52 + 'CCC',
1.53 + 'CXXFLAGS',
1.54 + 'CXX',
1.55 + 'CCASFLAGS',
1.56 + 'CCAS',
1.57 +])
1.58 +
1.59 +
1.60 +# Autoconf, in some of the sub-configures used in the tree, likes to error
1.61 +# out when "precious" variables change in value. The solution it gives to
1.62 +# straighten things is to either run make distclean or remove config.cache.
1.63 +# There's no reason not to do the latter automatically instead of failing,
1.64 +# doing the cleanup (which, on buildbots means a full clobber), and
1.65 +# restarting from scratch.
1.66 +def maybe_clear_cache():
1.67 + comment = re.compile(r'^\s+#')
1.68 + cache = {}
1.69 + with open('config.cache') as f:
1.70 + for line in f.readlines():
1.71 + if not comment.match(line) and '=' in line:
1.72 + key, value = line.split('=', 1)
1.73 + cache[key] = value
1.74 + for precious in PRECIOUS_VARS:
1.75 + entry = 'ac_cv_env_%s_value' % precious
1.76 + if entry in cache and (not precious in os.environ or os.environ[precious] != cache[entry]):
1.77 + os.remove('config.cache')
1.78 + return
1.79 +
1.80 +
1.81 +def dump(dump_file, shell):
1.82 + if os.path.exists('config.cache'):
1.83 + maybe_clear_cache()
1.84 + if not os.path.exists('config.status'):
1.85 + if os.path.exists(dump_file):
1.86 + os.remove(dump_file)
1.87 + return
1.88 +
1.89 + config_files = [File('config.status')]
1.90 +
1.91 + # Scan the config.status output for information about configuration files
1.92 + # it generates.
1.93 + config_status_output = subprocess.check_output(
1.94 + [shell, '-c', './config.status --help'],
1.95 + stderr=subprocess.STDOUT).splitlines()
1.96 + state = None
1.97 + for line in config_status_output:
1.98 + if line.startswith('Configuration') and line.endswith(':'):
1.99 + state = 'config'
1.100 + elif not line.startswith(' '):
1.101 + state = None
1.102 + elif state == 'config':
1.103 + for f in (couple.split(':')[0] for couple in line.split()):
1.104 + if os.path.isfile(f):
1.105 + config_files.append(File(f))
1.106 +
1.107 + with open(dump_file, 'wb') as f:
1.108 + pickle.dump(config_files, f)
1.109 +
1.110 +
1.111 +def adjust(dump_file, configure):
1.112 + if not os.path.exists(dump_file):
1.113 + return
1.114 +
1.115 + config_files = []
1.116 +
1.117 + try:
1.118 + with open(dump_file, 'rb') as f:
1.119 + config_files = pickle.load(f)
1.120 + except Exception:
1.121 + pass
1.122 +
1.123 + for f in config_files:
1.124 + # Still touch config.status if configure is newer than its original
1.125 + # mtime.
1.126 + if configure and os.path.basename(f.path) == 'config.status' and \
1.127 + os.path.getmtime(configure) > f.mtime:
1.128 + continue
1.129 + f.update_time()
1.130 +
1.131 + os.remove(dump_file)
1.132 +
1.133 +
1.134 +CONFIG_DUMP = 'config_files.pkl'
1.135 +
1.136 +if __name__ == '__main__':
1.137 + if sys.argv[1] == 'dump':
1.138 + dump(CONFIG_DUMP, sys.argv[2])
1.139 + elif sys.argv[1] == 'adjust':
1.140 + adjust(CONFIG_DUMP, sys.argv[2] if len(sys.argv) > 2 else None)
