https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90294
--- Comment #2 from Fred Krogh <siteg at mathalacarte dot com> --- Created attachment 46268 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46268&action=edit gfortran -g -o testi testi.f90 gives the error below Look at r > 0 NaN Note: The following floating-point exceptions are signalling: IEEE_INVALID_FLAG