Re: [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp

From: Segher Boessenkool
Date: Thu Aug 29 2019 - 04:33:56 EST

On Wed, Aug 28, 2019 at 03:16:19PM -0700, Nick Desaulniers wrote:
> That's a good reason IMO. IIRC, the -fno-builtin-* flags don't warn
> if * is some unrecognized value, so -fno-builtin-setjmp may not
> actually do anything, and you may need to scan the source (of clang or
> llvm).

-fno-builtin-foo makes the compiler not handle "foo" the same as it
handles "__builtin_foo". If the compiler has no idea about "foo", well,
that is exactly what it does then anyhow, so why would it warn :-)