https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82865
--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> --- I would be OK with a hard error. If so, we need to think about any other similir situations with other modern fortran features. Then we get into a game of chasing more rabits. Perhaps best to document and just say that -fdec it is known to be incompatible with some constructs such as PDT and should not be mixed with modern fortran.
