2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
7 Generates shim headers that mirror the directory structure of bundled headers,
8 but just forward to the system ones.
10 This allows seamless compilation against system headers with no changes
21 #if defined(OFFICIAL_BUILD)
22 #error shim headers must not be used in official builds!
27 def GeneratorMain(argv):
28 parser = optparse.OptionParser()
29 parser.add_option('--headers-root', action='append')
30 parser.add_option('--define', action='append')
31 parser.add_option('--output-directory')
32 parser.add_option('--prefix', default='')
33 parser.add_option('--use-include-next', action='store_true')
34 parser.add_option('--outputs', action='store_true')
35 parser.add_option('--generate', action='store_true')
37 options, args = parser.parse_args(argv)
39 if not options.headers_root:
40 parser.error('Missing --headers-root parameter.')
41 if not options.output_directory:
42 parser.error('Missing --output-directory parameter.')
44 parser.error('Missing arguments - header file names.')
46 source_tree_root = os.path.abspath(
47 os.path.join(os.path.dirname(__file__), '..', '..'))
49 for root in options.headers_root:
50 target_directory = os.path.join(
51 options.output_directory,
52 os.path.relpath(root, source_tree_root))
53 if options.generate and not os.path.exists(target_directory):
54 os.makedirs(target_directory)
56 for header_spec in args:
57 if ';' in header_spec:
60 include_after) = header_spec.split(';', 2)
62 header_filename = header_spec
66 yield os.path.join(target_directory, header_filename)
68 with open(os.path.join(target_directory, header_filename), 'w') as f:
69 f.write(SHIM_TEMPLATE)
72 for define in options.define:
73 key, value = define.split('=', 1)
74 # This non-standard push_macro extension is supported
75 # by compilers we support (GCC, clang).
76 f.write('#pragma push_macro("%s")\n' % key)
77 f.write('#undef %s\n' % key)
78 f.write('#define %s %s\n' % (key, value))
81 for header in include_before.split(':'):
82 f.write('#include %s\n' % header)
84 include_target = options.prefix + header_filename
85 if options.use_include_next:
86 f.write('#include_next <%s>\n' % include_target)
88 f.write('#include <%s>\n' % include_target)
91 for header in include_after.split(':'):
92 f.write('#include %s\n' % header)
95 for define in options.define:
96 key, value = define.split('=', 1)
97 # This non-standard pop_macro extension is supported
98 # by compilers we support (GCC, clang).
99 f.write('#pragma pop_macro("%s")\n' % key)
103 return '\n'.join(GeneratorMain(argv))
106 if __name__ == '__main__':