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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99651] Cannot change attributes of USE-associated
 intrinsic
Date: Thu, 18 Mar 2021 20:16:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99651

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-03-18
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
That's for matching 'NULL()' in:
  CHAR_STAR_NULL =3D CHAR_STAR(NULL())
The problem is that during matching we end up
in  gfc_match_rvalue  for:
      /* Give up, assume we have a function.  */
      e->expr_type =3D EXPR_FUNCTION;

      if (!sym->attr.function
          && !gfc_add_function (&sym->attr, sym->name, NULL))
which then also set:
  if (attr->flavor !=3D FL_PROCEDURE
      && !gfc_add_flavor (attr, FL_PROCEDURE, name, where))
    return false;
 attr->function =3D 1


And later then:
  resolve_function =E2=86=92 resolve_unknown_f =E2=86=92 gfc_intrinsic_func=
_interface
the latter than has:
  if (sym->attr.flavor =3D=3D FL_UNKNOWN)
    {
      sym->attr.function =3D 1;
      sym->attr.intrinsic =3D 1;
      sym->attr.flavor =3D FL_PROCEDURE;
    }

Thus, at the end intrinsic is not set in the module.
For the next use, we run into the following in gfc_match_null:

  if (sym->attr.proc !=3D PROC_INTRINSIC
      && !(sym->attr.use_assoc && sym->attr.intrinsic)
      && (!gfc_add_procedure(&sym->attr, PROC_INTRINSIC, sym->name, NULL)
          || !gfc_add_function (&sym->attr, sym->name, NULL)))
    return MATCH_ERROR;

Here, we have:
- PROC_UNKNOWN
- sym->attr.intrinsic =3D=3D 0
- gfc_add_procedure
  =E2=86=92 this calls 'check_used' =E2=86=92 which fails due to attr->use_=
assoc !=3D 0.=