[Bug bootstrap/64919] bootstrap failure of gcc-4.9.2 on ia64-hpux in libgcc

[bugzilla-gcc at thewrittenword dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64919

--- Comment #36 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
(In reply to The Written Word from comment #35)
> I am trying to build 4.9.4 with a patched 4.7.4 and am running into the
> following failure:
> /opt/build/china/gcc-4.9.4/.obj/./gcc/xgcc
> -B/opt/build/china/gcc-4.9.4/.obj/./gcc/
> -B/opt/build/gcc49/ia64-hp-hpux11.31/bin/
> -B/opt/build/gcc49/ia64-hp-hpux11.31/lib/ -isystem
> /opt/build/gcc49/ia64-hp-hpux11.31/include -isystem
> /opt/build/gcc49/ia64-hp-hpux11.31/sys-include    -g -O2 -O2  -g -O2
> -DIN_GCC    -DUSE_LIBUNWIND_EXCEPTIONS -W -Wall -Wno-narrowing
> -Wwrite-strings -Wcast-qual -Wno-format -Wstrict-prototypes
> -Wmissing-prototypes -Wold-style-definition  -isystem ./include   -g
> -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -I. -I. -I../.././gcc
> -I/opt/build/china/gcc-4.9.4/libgcc -I/opt/build/china/gcc-4.9.4/libgcc/.
> -I/opt/build/china/gcc-4.9.4/libgcc/../gcc
> -I/opt/build/china/gcc-4.9.4/libgcc/../include  -DHAVE_CC_TLS  -o emutls.o
> -MT emutls.o -MD -MP -MF emutls.dep -fexceptions -c
> /opt/build/china/gcc-4.9.4/libgcc/emutls.c -fvisibility=hidden -DHIDE_EXPORTS
> /opt/build/china/gcc-4.9.4/libgcc/emutls.c: In function
> '__emutls_get_address':
> /opt/build/china/gcc-4.9.4/libgcc/emutls.c:188:1: internal compiler error:
> in simplify_subreg, at simplify-rtx.c:5917
>  }
>  ^
> 
> Should I build this with -O0 as well?

I can build 4.9.3 on HP-UX 11.31/IA but not 4.9.4. So, looks like something
changed to break the build in 4.9.4.