https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88303
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Libgomp certainly does respect RUNTESTFLAGS, I use make check-target-libgomp RUNTESTFLAGS=c.exp=atomic-2.c and similar very often. Isn't the problem that toplevel check-fortran depends on check-target-libgomp-fortran which does: check-target-libgomp-fortran: $(MAKE) RUNTESTFLAGS="$(RUNTESTFLAGS) fortran.exp" check-target-libgomp and thus checks all fortran? I have no idea what to change it to support what you want though, I'd suggest just do make -C gcc check-gfortran RUNTESTFLAGS="dg.exp=pr88269.f90" if you want to check something in the GCC testsuite, not use the toplevel check-fortran. Because say for make check-fortran RUNTESTFLAGS='--target_board=unix\{-m32,-m64\}' you'd still want to add fortran.exp in there, but perhaps not add it if you specify some particular *.exp with arguments.