Hi!
As mentioned in the PR, there is a *.mod incompatibility between GCC 14 and
GCC 15, at least when using iso_c_binding or iso_fortran_env intrinsic
modules, because new entries have been added to those modules in the middle,
causing changes in the constants emitted in the *.mod files.
Also, I fear modules produced with GCC 15 with -funsigned and using UNSIGNED
in the modules will be unreadable by GCC 14.
The following patch just bumps MOD_VERSION for this.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
Note, I'll post incrementally a WIP on accepting also MOD_VERSION "15",
but it is unfinished.
2025-01-08 Jakub Jelinek <ja...@redhat.com>
PR fortran/118337
* module.cc (MOD_VERSION): Bump to "16".
--- gcc/fortran/module.cc.jj 2025-01-02 11:47:31.697201637 +0100
+++ gcc/fortran/module.cc 2025-01-07 21:41:46.866494776 +0100
@@ -84,7 +84,7 @@ along with GCC; see the file COPYING3.
/* Don't put any single quote (') in MOD_VERSION, if you want it to be
recognized. */
-#define MOD_VERSION "15"
+#define MOD_VERSION "16"
/* Structure that describes a position within a module file. */
Jakub
