https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80988
--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- (In reply to Jerry DeLisle from comment #2) > Try compiling with -fno-frontend-optimize to confirm. ... and if this fixes the problem (assuming it is in foo.f90), do the following: $ gfortran -c -fno-frontend-optimize -fdump-fortran-original foo.f90 > foo-1.dump $ gfortran -c -ffrontend-optimize -fdump-fortran-original foo.f90 > foo-2.dump $ diff -u foo-1.dump foo-2.dump This will show you the relevant differences. This should help you in creating a (hopefully) much-reduced testcase.
