https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #98 from C. Heide <cameron.heide at betasystems dot com> --- (In reply to The Written Word from comment #97) > (In reply to C. Heide from comment #73) > > With that change, and some other cajoling (the previously mentioned > > duplicate symbols and operand64 problem, and -O1 to work around the ICE), I > > can now get gcc-8.3 to do a full bootstrap on HP-UX 11.23 ia64. > > No issues with PCH or libsupc++ like I'm seeing? No, but the only "working" build I've had so far was with the "#undef MAKE_DECL_ONE_ONLY" hack and had the duplicate symbol problem. If I remove that hack as recommended, I then get a segfault ICE even earlier than you do, where the stage 2 compiler seems completely broken and crashes even on a single empty function (haven't been able to do much with that yet).