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: > > From: Nathan Chancellor > > > Sent: 28 August 2019 19:45 > > ... > > > 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
