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Date: Thu, 29 Aug 2019 03:32:59 -0500
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: [PATCH] powerpc: Avoid clang warnings around setjmp and longjmp
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Cc: LKML <linux-kernel@vger.kernel.org>, "# 3.4.x" <stable@vger.kernel.org>,
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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 :-)


Segher