http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59985
--- Comment #4 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- (In reply to Jakub Jelinek from comment #3) > Can you just cut'n'paste from build log command line to compile > lto-streamer-in.o and rerun it by hand with -fcompare-debug? the build step from stage 3 (without -gtoggle) prints: xg++: error: ../../gcc-4.9-20140126/gcc/lto-streamer-in.c: -fcompare-debug failure (length)