https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96486
--- Comment #8 from Susi Lehtola <jussilehtola at fedoraproject dot org> --- (In reply to kargl from comment #5) > What gfortran version and operating system? I get > > % gfcx -o z b.f90 && ./z > STOP System variable unassigned > % gfcx -o z -g b.f90 && ./z > STOP System variable unassigned > % gfcx -o z -g -O b.f90 && ./z > STOP System variable unassigned > > with your code where gfcx is gfortran 10.0.0 (Jan 2020 vintage) > and I'm using i585-*-freebsd. This is $ gfortran --version GNU Fortran (GCC) 10.2.1 20200723 (Red Hat 10.2.1-1) Copyright (C) 2020 Free Software Foundation, Inc.