Survey of complex usage of distutils.

[Dave Cole]

In my Sybase module setup.py I have this flakey and nasty piece of
code to handle a distutils limitation that probably should not be
there.

    # distutils does not allow -D HAVE_FREETDS=60 so I have to find this
    # argument myself and remove it from sys.argv and set the macro via
    # the define_macros argument to the extension module.
    for i in range(1, len(sys.argv)):
        # Find arguments like '-DHAVE_FREETDS=60' and variants
        parts = string.split(sys.argv[i], 'HAVE_FREETDS')
        if len(parts) == 1:
            continue
        prefix, suffix = parts[:2]
        # Ignore -DHAVE_FREETDS which does not set a value (=blah)
        if not suffix or suffix[0] != '=':
            continue
        # Remove this argument from sys.argv
        del sys.argv[i]
        # If -D was in previous argument then remove that as well
        if not prefix and sys.argv[i - 1] == '-D':
            del sys.argv[i - 1]
        # Now set the TDS level the other other way.
        syb_macros.append(('HAVE_FREETDS', suffix[1:]))
        if prefix:
            # Handle -D WANT_X,HAVE_FREETDS=60 case
            if prefix[-1] == ',':
                prefix = prefix[:-1]
            sys.argv[i:i] = [prefix]
        break

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