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

On Mon, Sep 02, 2019 at 10:55:53PM -0700, Nathan Chancellor wrote:

On Thu, Aug 29, 2019 at 09:59:48AM +0000, David Laight wrote:

quoted

From: Nathan Chancellor

quoted

Sent: 28 August 2019 19:45

...

quoted

However, I think that -fno-builtin-* would be appropriate here because
we are providing our own setjmp implementation, meaning clang should not
be trying to do anything with the builtin implementation like building a
declaration for it.

Isn't implementing setjmp impossible unless you tell the compiler that
you function is 'setjmp-like' ?

No idea, PowerPC is the only architecture that does such a thing.

Since setjmp can return more than once, yes, exciting things can happen
if you do not tell the compiler about this.


Segher