https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65773
--- Comment #6 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- $ /home/wschmidt/gcc/install/gcc-5_1/bin/g++ -O1 -std=c++11 -S AArch64InstrInfo.ii -fno-icf g++: error: unrecognized command line option '-fno-icf'