https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66193
--- Comment #3 from Gerhard Steinmetz <gerhard.steinmetz.fort...@t-online.de> --- Hmm, no observable difference with option -fno-frontend-optimize, sorry. Of course I probed some combinations for several options. One example for a more extensive "debug" run : gfortran \ -O0 -g -msse3 \ -fno-omit-frame-pointer \ -fdefault-real-8 \ -fno-align-commons \ -std=f2008 \ -pedantic \ -fcheck=all \ -fbacktrace \ -ftrapv \ -ffpe-trap=invalid,zero,overflow \ -fstack-protector \ -fstack-protector-all \ \ -Wall \ -Wextra \ -Wsurprising \ -Warray-bounds \ -Warray-temporaries \ -Wcharacter-truncation \ -Wconversion-extra \ -Wfunction-elimination \ -Wrealloc-lhs \ -Wrealloc-lhs-all \ -Wtabs \ -Wunderflow \ -Wunused-dummy-argument \ \ # ... some more # ... with and without -c