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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/99138] ICE in gfc_match_rvalue, at fortran/primary.c:3738
Date: Tue, 16 Mar 2021 21:32:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99138

--- Comment #8 from anlauf at gcc dot gnu.org ---
The check in interface.c:gfc_check_result_characteristics has an asymmetry
coming from symbol.c:gfc_type_compatible that could be evaded by swapping
arguments:

diff --git a/gcc/fortran/interface.c b/gcc/fortran/interface.c
index f7ca52e6550..8758f146d57 100644
--- a/gcc/fortran/interface.c
+++ b/gcc/fortran/interface.c
@@ -1561,7 +1561,7 @@ gfc_check_result_characteristics (gfc_symbol *s1,
gfc_symbol *s2,
     return true;

   /* Check type and rank.  */
-  if (!compare_type_characteristics (r1, r2))
+  if (!compare_type_characteristics (r2, r1))
     {
       snprintf (errmsg, err_len, "Type mismatch in function result (%s/%s)=
",
                gfc_typename (&r1->ts), gfc_typename (&r2->ts));

However, we then hits other issues later on with the ALLOCATABLE attribute.

:-(=