https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53431
--- Comment #9 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- (In reply to Manuel López-Ibáñez from comment #5) > The C++ parser lexes (and preprocesses) before handling the pragmas, whereas > the C parser processes the pragmas as it sees them. > > We must somehow parse these pragmas *also* in cp/parser.c:631. Maybe one can > do something similar to what we do for cp_parser_initial_pragma, but within > the loop and only handling pragma diagnostic. Surely, it will need some > trial and error to get it right. If any of you wants to give it a try and > need some help, just ask here or in the mailing list. There are two problems that need fixing to implement this: 1. At the point the pragma is lexed we don't know that this is pragma GCC diagnostic, since the pragmas are registered dynamically and there is no (enum pragma_kind) PRAGMA_GCC_DIAGNOSTIC. Perhaps one could do what is done for PRAGMA_GCC_PCH_PREPROCESS. 2. The second problem is that handle_pragma_diagnostic does not work during lexing (at least for C++). We would need to rewrite the whole function and call it directly.
