http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59276
Bug ID: 59276 Summary: Incorrect error message with modules of different gfortran versions Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran Assignee: unassigned at gcc dot gnu.org Reporter: Joost.VandeVondele at mat dot ethz.ch This 'bug' might lead to some confusion. If an older version of gfortran (i.e. 4.8) reads a module generated with 4.9 the error message is: Fatal Error: File 'm1.mod' opened at (1) is not a GNU Fortran module file instead of the more useful variant one had with 4.8/4.7 Fatal Error: Wrong module version '10' (expected '9') for file 'm1.mod' opened at (1) I don't see how this can be fixed other than fixing the error message on the release branches into '... not a module file compatible with this version of GNU Fortran'.