On Fri, Feb 02, 2018 at 10:12:24PM +0000, Sergei Trofimovich wrote: > The strace breakage looks like that: > ./strace: get_regs: get_regs_error: Input/output error > > It happens because ia64 needs to load unwind tables > to read certain registers. Unwind tables fail to load > due to GCC quirk on the following code: > > extern char __end_unwind; > const struct unw_table_entry *end = (struct unw_table_entry *)table_end; > table->end = segment_base + end[-1].end_offset; > > GCC does not generate correct code for this single memory > reference after constant propagation (see https://gcc.gnu.org/PR84184).
I'm not seeing this ... probably because I build with a pre-historic 4.3.4 version of gcc. Do you know which version(s) are affected? I'm not looking for an exhaustive list, just the one on which you found this would be good. -Tony