http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59469
--- Comment #19 from Jan Hubicka <hubicka at ucw dot cz> --- > I can't reproduce this. > What platform is this? What is the command line? I used x86-64 and you apparently need LTO to trigger it. I used same commandline as in original report g++ -flto-partition=none -flto -fPIC -shared -fno-rtti -O3 BasicBlock.ii Function.ii You may produce object files and that will get you to dataflow earilier.