teak-llvm/llvm/utils/llvm-build/llvmbuild/main.py

import os

def main():
    from optparse import OptionParser, OptionGroup
    parser = OptionParser("usage: %prog [options]")
    parser.add_option("", "--source-root", dest="source_root", metavar="PATH",
                      help="Path to the LLVM source (inferred if not given)",
                      action="store", default=None)
    (opts, args) = parser.parse_args()

    # Determine the LLVM source path, if not given.
    source_root = opts.source_root
    if source_root:
        if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
                                           'Function.cpp')):
            parser.error('invalid LLVM source root: %r' % source_root)
    else:
        llvmbuild_path = os.path.dirname(__file__)
        llvm_build_path = os.path.dirname(llvmbuild_path)
        utils_path = os.path.dirname(llvm_build_path)
        source_root = os.path.dirname(utils_path)
        if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
                                           'Function.cpp')):
            parser.error('unable to infer LLVM source root, please specify')

if __name__=='__main__':
    main()