[Bug c++/94257] New: ICE in inline nested namespace

[Bug c++/94257] New: ICE in inline nested namespace

[pacoarjonilla at yahoo dot es]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94257

            Bug ID: 94257
           Summary: ICE in inline nested namespace
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pacoarjonilla at yahoo dot es
  Target Milestone: ---

Only in GCC10

inline namespace B {
inline namespace B { }
}
inline namespace B {
class C {
    friend void f();
};
}


$> g++10 bug.cc 
cairo.cc:4:18: error: ‘namespace B { }’ conflicts with a previous declaration
    4 | inline namespace B {
      |                  ^
cairo.cc:1:18: note: previous declaration ‘namespace B { }’
    1 | inline namespace B {
      |                  ^
cairo.cc:6:19: internal compiler error: in do_push_nested_namespace, at
cp/name-lookup.c:7225
    6 |     friend void f();
      |                   ^
0x65c058 do_push_nested_namespace
        ../../gcc/gcc/cp/name-lookup.c:7225
0x991b8c push_nested_namespace(tree_node*)
        ../../gcc/gcc/cp/name-lookup.c:7494
0x951384 do_friend(tree_node*, tree_node*, tree_node*, tree_node*,
overload_flags, bool)
        ../../gcc/gcc/cp/friend.c:626
0x91cb5e grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ../../gcc/gcc/cp/decl.c:13364
0x93877f grokfield(cp_declarator const*, cp_decl_specifier_seq*, tree_node*,
bool, tree_node*, tree_node*)
        ../../gcc/gcc/cp/decl2.c:841
0x9d936b cp_parser_member_declaration
        ../../gcc/gcc/cp/parser.c:25259
0x9adb31 cp_parser_member_specification_opt
        ../../gcc/gcc/cp/parser.c:24703
0x9adb31 cp_parser_class_specifier_1
        ../../gcc/gcc/cp/parser.c:23800
0x9afbe3 cp_parser_class_specifier
        ../../gcc/gcc/cp/parser.c:24107
0x9afbe3 cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:17666
0x9b0cbb cp_parser_decl_specifier_seq
        ../../gcc/gcc/cp/parser.c:14314
0x9b1701 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:13568
0x9da782 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:13388
0x9da4c2 cp_parser_toplevel_declaration
        ../../gcc/gcc/cp/parser.c:13416
0x9da4c2 cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:13264
0x9da4c2 cp_parser_namespace_body
        ../../gcc/gcc/cp/parser.c:19644
0x9da4c2 cp_parser_namespace_definition
        ../../gcc/gcc/cp/parser.c:19622
0x9da8c8 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:13368
0x9daf0a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4731
0x9daf0a c_parse_file()
        ../../gcc/gcc/cp/parser.c:43758
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

[Bug c++/94257] ICE in inline nested namespace

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94257

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2020-03-25
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |mpolacek at gcc dot gnu.org,
                   |                            |nathan at gcc dot gnu.org

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
This compiled without errors until
r8-952-g945bf9e13f706bed44ec760ac60693e00c59b146:

94257.C:4:18: error: conflicting declaration of namespace ‘B’
 inline namespace B {
                  ^

and the ICE started with 
r8-1488-g71bbbd133f65c26f65709037401154362210560e

[Bug c++/94257] ICE in inline nested namespace

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94257

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |nathan at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

[Bug c++/94257] ICE in inline nested namespace

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94257

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathan Sidwell <nathan@gcc.gnu.org>:

https://gcc.gnu.org/g:9dba60130dc3ebf7cce8716a36672281688693f7

commit r10-7423-g9dba60130dc3ebf7cce8716a36672281688693f7
Author: Nathan Sidwell <nathan@acm.org>
Date:   Fri Mar 27 07:54:33 2020 -0700

    c++: Fix ICE after ambiguous inline namespace reopen [PR94257]

    Following DR2061, 'namespace F', looks for 'F's inside inline namespaces.
    That can result in ambiguous lookups that we failed to diagnose early
enough,
    leading us to push a new namespace and ICE later.  Diagnose the ambiguity
    earlier, and then pick one.

            PR c++/94257
            * name-lookup.c (push_namespace): Triage ambiguous lookups that
            contain namespaces.

[Bug c++/94257] ICE in inline nested namespace

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94257

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
Fixed 9dba60130dc3ebf7cce8716a36672281688693f7