https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56226
--- Comment #29 from Fritz Reese <fritzoreese at gmail dot com> --- (In reply to Andreas Schwab from comment #25) > FAIL: gfortran.dg/dec_union_4.f90 -O0 execution test > FAIL: gfortran.dg/dec_union_4.f90 -O1 execution test > FAIL: gfortran.dg/dec_union_4.f90 -O2 execution test > FAIL: gfortran.dg/dec_union_4.f90 -O3 -fomit-frame-pointer -funroll-loops > -fpeel-loops -ftracer -finline-functions execution test > FAIL: gfortran.dg/dec_union_4.f90 -O3 -g execution test > FAIL: gfortran.dg/dec_union_4.f90 -Os execution test It was silly of me to disregard endian-ness in this test case. Fixed: https://gcc.gnu.org/ml/fortran/2016-05/msg00018.html