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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/100463] many errors using GTY and hash_map
Date: Thu, 06 May 2021 21:19:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100463

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
As it turns out, the hash_map primary template is incomplete.  Defining the
following member fixes that error only to expose another:

index 0779c930f0a..c07bd04704f 100644
--- a/gcc/hash-map.h
+++ b/gcc/hash-map.h
@@ -114,6 +114,11 @@ class GTY((user)) hash_map

     static void
       pch_nx_helper (unsigned int, gt_pointer_operator, void *)
+       {
+       }
+
+    static void
+      pch_nx_helper (long int, gt_pointer_operator, void *)
        {
        }

In file included from /ssd/src/gcc/trunk/gcc/hash-table.h:595,
                 from /ssd/src/gcc/trunk/gcc/coretypes.h:480,
                 from /ssd/src/gcc/trunk/gcc/except.c:114:
/ssd/src/gcc/trunk/gcc/hash-map.h: In instantiation of =E2=80=98static void=
 hash_map<
<template-parameter-1-1>, <template-parameter-1-2>, <template-parameter-1-3>
>::hash_entry::pch_nx(hash_map< <template-parameter-1-1>,
<template-parameter-1-2>, <template-parameter-1-3> >::hash_entry&) [with Ke=
yId
=3D int_hash<long int, 0, 9223372036854775807>; Value =3D int; Traits =3D
simple_hashmap_traits<default_hash_traits<int_hash<long int, 0,
9223372036854775807> >, int>]=E2=80=99:
/ssd/src/gcc/trunk/gcc/hash-table.h:1198:17:   required from =E2=80=98void
gt_pch_nx(hash_table<E>*) [with D =3D hash_map<int_hash<long int, 0,
9223372036854775807>, int>::hash_entry]=E2=80=99
/ssd/src/gcc/trunk/gcc/hash-map.h:319:13:   required from =E2=80=98void
gt_pch_nx(hash_map<K, V, H>*) [with K =3D int_hash<long int, 0,
9223372036854775807>; V =3D int; H =3D
simple_hashmap_traits<default_hash_traits<int_hash<long int, 0,
9223372036854775807> >, int>]=E2=80=99
./gt-except.h:97:19:   required from here
/ssd/src/gcc/trunk/gcc/hash-map.h:87:12: error: call of overloaded
=E2=80=98gt_pch_nx(hash_map<int_hash<long int, 0, 9223372036854775807>, int=
>::Key&)=E2=80=99 is
ambiguous
  gt_pch_nx (e.m_key);
  ~~~~~~~~~~^~~~~~~~~
In file included from /ssd/src/gcc/trunk/gcc/hash-table.h:247,
                 from /ssd/src/gcc/trunk/gcc/coretypes.h:480,
                 from /ssd/src/gcc/trunk/gcc/except.c:114:
/ssd/src/gcc/trunk/gcc/ggc.h:341:1: note: candidate: =E2=80=98void gt_pch_n=
x(int)=E2=80=99
 gt_pch_nx (int)
 ^~~~~~~~~
/ssd/src/gcc/trunk/gcc/ggc.h:346:1: note: candidate: =E2=80=98void gt_pch_n=
x(unsigned
int)=E2=80=99
 gt_pch_nx (unsigned int)
 ^~~~~~~~~=