[LLVMdev] Semantics of __builtin_setjmp/__builtin_longjmp

[Jim Grosbach]

Correct on all counts.

-Jim

> On Feb 10, 2015, at 1:16 PM, Tim Northover <t.p.northover at gmail.com> wrote:
> 
>> (b) Are they supposed to be compatible with GCC?
> 
> I think they're probably not supposed to be compatible with libc, but
> should be with GCC.
> 
> Libc gets to choose its implementation in setjmp.h. It might implement
> them completely separately (which would still work however we
> implement the __builtins), or it might make use of the __builtins (in
> which case we should certainly make sure they're compatible).
> 
>> If not with libc, why with GCC?
> 
> Because the GCC builtins are an ABI issue controlled by the compiler:
> we need to be compatible to mix object files on the platform.
> 
> Cheers.
> 
> Tim.
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