http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46905 --- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> 2010-12-12 14:19:00 UTC --- Same bug seems to be in the code generating phase gcc -O2 -flto -fno-lto object.o does code generation even if object.o has fallback code