Parser extension points for plug-ins

[Ludovic Courtès]

Hello,

The current set of plug-in events does not appear to include extension
points at the parser level.

I think it may be useful to allow plug-ins to process, e.g., #pragmas.
That would allow directives à la OpenMP to be added/extended, which is
an increasingly popular way to augment C and other languages.

Has it been discussed before?  What do people think?

Thanks,
Ludo’.