https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64919
--- Comment #35 from The Written Word <bugzilla-gcc at thewrittenword dot com> --- 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?
