getopt.add_option('s', "stage", stage_str, GetOpt::REQUIRED_ARG).set_help("Output GLSL for STAGE", "STAGE");
getopt.add_option('m', "module", as_module, GetOpt::NO_ARG).set_help("Compile as unspecialized module");
getopt.add_option('t', "target-version", target_version, GetOpt::REQUIRED_ARG).set_help("Specify target GLSL version", "VER");
getopt.add_option('s', "stage", stage_str, GetOpt::REQUIRED_ARG).set_help("Output GLSL for STAGE", "STAGE");
getopt.add_option('m', "module", as_module, GetOpt::NO_ARG).set_help("Compile as unspecialized module");
getopt.add_option('t', "target-version", target_version, GetOpt::REQUIRED_ARG).set_help("Specify target GLSL version", "VER");