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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114889] New: [modules] ICE in friend_accessible_p with
 imported class template specialization befriending class template
Date: Mon, 29 Apr 2024 13:15:53 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114889

            Bug ID: 114889
           Summary: [modules] ICE in friend_accessible_p with imported
                    class template specialization befriending class
                    template
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppalka at gcc dot gnu.org
  Target Milestone: ---

$ cat testcase_a.C
export module mymod;

template <typename, typename>
struct _Hashtable;

export
template <typename _Key, typename _Val>
struct _Map_base {
  void f() {
    _Hashtable<_Key, _Val> __h;
    __h._M_hash_code(0);
  }
};

template <typename _Key, typename _Value>
struct _Hashtable {
  template <typename, typename> friend struct _Map_base;
protected:
  void _M_hash_code(int);
};

_Hashtable<int, int> m;

$ cat testcase_b.C
import mymod;

int main() {
  _Map_base<int, int> m;
  m.f();
}

$ g++ -fmodules-ts testcase_*
In module mymod, imported at testcase_b.C:1:
testcase_a.C: In instantiation of =E2=80=98void _Map_base@mymod<_Key, _Val>=
::f() [with
_Key =3D int; _Val =3D int]=E2=80=99:
testcase_b.C:5:6:   required from here
    5 |   m.f();
      |   ~~~^~
testcase_a.C:11:21: internal compiler error: in friend_accessible_p, at
cp/search.cc:803
   11 |     __h._M_hash_code(0);
      |     ~~~~~~~~~~~~~~~~^~~=