https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88299
--- Comment #1 from Harald Anlauf <anlauf at gmx dot de> ---
The warning was introduced in:
r260705 | janus | 2018-05-25 08:09:10 +0200 (Fri, 25 May 2018) | 16 lines
2018-05-25 Janus Weil <ja...@gcc.gnu.org>
PR fortran/85839
* match.c (gfc_match_block_data): Call gfc_notify_std to warn about
an obsolescent feature in Fortran 2018.
(gfc_match_equivalence): Ditto.
* resolve.c (resolve_common_blocks): Ditto.
(gfc_resolve_forall): Ditto.
* symbol.c (gfc_define_st_label): Ditto.
Maybe the warning can be restricted to those files / compilation units
where the COMMON is declared?
The COMMON unfortunately pollutes all upstream module files (*.mod),
even if no symbol is imported (see e.g. mod2 in the testcase).
