> The Right Thing is for -pedantic not to cause errors, only warnings > (-pedantic-errors being needed for an error). So rather than having this > conditional for whether to allow the extension at all, make the > conditional code do a pedwarn (if flag_isoc99, otherwise there will > already have been one for using a compound literal at all, and not for > VECTOR_TYPE). (I don't believe this can affect the semantics of valid > code; in this case of require_constant with a compound literal, we know > the code is invalid in ISO C terms, so it's safe to diagnose it then > interpret it in a sensible way.)
I think there is roughly consensus about how C/C++ diagnostics should work, but it is easy to forget it since it is not really written anywhere. Thus, I drafted some guidelines at:https://gcc.gnu.org/wiki/Better_Diagnostics#guidelines Please, could you take a look and comment whether I got it right/wrong? New items are very welcome! Cheers, Manuel.
