opts_set(opts.warn, WARN_UNREACHABLE_CODE, true);
opts_set(opts.warn, WARN_CPP, true);
opts_set(opts.warn, WARN_UNKNOWN_ATTRIBUTE, true);
opts_set(opts.warn, WARN_UNREACHABLE_CODE, true);
opts_set(opts.warn, WARN_CPP, true);
opts_set(opts.warn, WARN_UNKNOWN_ATTRIBUTE, true);