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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/104332] [9/10/11/12 Regression] ICE in resolve_symbol,
 at fortran/resolve.cc:15815
Date: Tue, 01 Feb 2022 20:04:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104332

kargl at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-02-01

--- Comment #3 from kargl at gcc dot gnu.org ---
(In reply to G. Steinmetz from comment #0)
> Affects versions down to r8 (ifort/ifx rejects it) :
>=20
>=20
> $ cat z1.f90
> block data
>    bind(c) a
> end
>=20

This fixes the ICE by avoiding a NULL pointer dereference.

diff --git a/gcc/fortran/resolve.cc b/gcc/fortran/resolve.cc
index 835a4783718..0ea68c707a0 100644
--- a/gcc/fortran/resolve.cc
+++ b/gcc/fortran/resolve.cc=20
@@ -15812,8 +15815,9 @@ resolve_symbol (gfc_symbol *sym)

       /* First, make sure the variable is declared at the
         module-level scope (J3/04-007, Section 15.3).  */
-      if (sym->ns->proc_name->attr.flavor !=3D FL_MODULE &&
-          sym->attr.in_common =3D=3D 0)
+      if (sym->ns->proc_name
+         && sym->ns->proc_name->attr.flavor !=3D FL_MODULE
+         && sym->attr.in_common =3D=3D 0)
        {
          gfc_error ("Variable %qs at %L cannot be BIND(C) because it "
                     "is neither a COMMON block nor declared at the "=