Andreas,
OTOH I like your idea to add a on_warning() pp hook function (same should be added for #error as well). What do you think, what if we use the return value of the on_warning() pp hook to decide, whether to throw the exception? This way we could keep the default behaviour (throwing) but you could enforce the non-throwing behaviour simply by returning false.
I think using the return value form on_warning() or on_hook() to decide if an exception should be thrown is an excellent idea. That would fit very well with my needs.
I've added two new pp hook functions: found_error_directive() and found_warning_directive(), both taking the context and the directive argument token sequence as their arguments. The return vaue is used to suppress the corresponding exception (true suppresses, false keeps the old behaviour). I have not updated the docs yet (but will do soon). The changes are in the CVS::HEAD branch only (I'm not allowed to add new features to the release branch). HTH Regards Hartmut