Failure to build librseq on ppc

[Segher Boessenkool]

On Wed, Jul 08, 2020 at 08:01:23PM -0400, Mathieu Desnoyers wrote:
> > > #define RSEQ_ASM_OP_CMPEQ(var, expect, label)                                   \
> > >                 LOAD_WORD "%%r17, %[" __rseq_str(var) "]\n\t"                   \
> > 
> > The way this hardcodes r17 *will* break, btw.  The compiler will not
> > likely want to use r17 as long as your code (after inlining etc.!) stays
> > small, but there is Murphy's law.
> 
> r17 is in the clobber list, so it should be ok.

What protects r17 *after* this asm statement?


Segher