https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84127
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |egallager at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #1)
> I can confirm that diagnostic pragmas that affect the preprocessor have no
> effect in C++. When compiled in C mode all warnings are suppressed.
> In C++ mode none is.
(In reply to Jakub Jelinek from comment #2)
> The reason why the GCC diagnostic ignore pragma works for this warning in C
> and doesn't in C++ is that in C++ we preprocess/tokenize everything first
> and only then start parsing it. The pragmas are handled while parsing
> stuff, after all the preprocessing and thus also preprocessor diagnostics is
> emitted.
>
> To handle what you want would require that we handle GCC diagnostic pragmas
> twice, once during preprocessing using preprocessor tokenization
> infrastructure first and then once again after the preprocessing.
I think there's some other bug open about this, but I forget which it is...
