https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109865
--- Comment #12 from GARY.WHITE at ColoState dot edu <Gary.White at ColoState dot edu> --- I just checked, and the bug occurs with the LAPACK routines instead of LinPack. So "make type=markLAPACK" will generate markLAPACK that will fail with -O3, but work with -O0. --- Comment #13 from GARY.WHITE at ColoState dot edu <Gary.White at ColoState dot edu> --- I just checked, and the bug occurs with the LAPACK routines instead of LinPack. So "make type=markLAPACK" will generate markLAPACK that will fail with -O3, but work with -O0.