108 lines
3.4 KiB
Python
Executable File
108 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2012 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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"""
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Generates shim headers that mirror the directory structure of bundled headers,
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but just forward to the system ones.
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This allows seamless compilation against system headers with no changes
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to our source code.
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"""
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import optparse
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import os.path
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import sys
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SHIM_TEMPLATE = """
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#if defined(OFFICIAL_BUILD)
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#error shim headers must not be used in official builds!
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#endif
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"""
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def GeneratorMain(argv):
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parser = optparse.OptionParser()
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parser.add_option('--headers-root', action='append')
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parser.add_option('--define', action='append')
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parser.add_option('--output-directory')
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parser.add_option('--prefix', default='')
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parser.add_option('--use-include-next', action='store_true')
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parser.add_option('--outputs', action='store_true')
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parser.add_option('--generate', action='store_true')
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options, args = parser.parse_args(argv)
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if not options.headers_root:
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parser.error('Missing --headers-root parameter.')
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if not options.output_directory:
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parser.error('Missing --output-directory parameter.')
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if not args:
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parser.error('Missing arguments - header file names.')
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source_tree_root = os.path.abspath(
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os.path.join(os.path.dirname(__file__), '..', '..'))
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for root in options.headers_root:
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target_directory = os.path.join(
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options.output_directory,
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os.path.relpath(root, source_tree_root))
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if options.generate and not os.path.exists(target_directory):
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os.makedirs(target_directory)
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for header_spec in args:
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if ';' in header_spec:
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(header_filename,
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include_before,
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include_after) = header_spec.split(';', 2)
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else:
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header_filename = header_spec
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include_before = ''
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include_after = ''
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if options.outputs:
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yield os.path.join(target_directory, header_filename)
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if options.generate:
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with open(os.path.join(target_directory, header_filename), 'w') as f:
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f.write(SHIM_TEMPLATE)
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if options.define:
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for define in options.define:
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key, value = define.split('=', 1)
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# This non-standard push_macro extension is supported
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# by compilers we support (GCC, clang).
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f.write('#pragma push_macro("%s")\n' % key)
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f.write('#undef %s\n' % key)
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f.write('#define %s %s\n' % (key, value))
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if include_before:
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for header in include_before.split(':'):
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f.write('#include %s\n' % header)
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include_target = options.prefix + header_filename
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if options.use_include_next:
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f.write('#include_next <%s>\n' % include_target)
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else:
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f.write('#include <%s>\n' % include_target)
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if include_after:
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for header in include_after.split(':'):
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f.write('#include %s\n' % header)
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if options.define:
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for define in options.define:
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key, value = define.split('=', 1)
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# This non-standard pop_macro extension is supported
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# by compilers we support (GCC, clang).
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f.write('#pragma pop_macro("%s")\n' % key)
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def DoMain(argv):
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return '\n'.join(GeneratorMain(argv))
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if __name__ == '__main__':
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DoMain(sys.argv[1:])
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