[Bug c++/60389] [4.8/4,9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[Bug c++/60389] [4.8/4,9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

Volker Reichelt <reichelt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.7.0
   Target Milestone|---                         |4.8.3
            Summary|[4.8/4,9 Regression] ICE    |[4.8/4,9 Regression]
                   |with inheriting             |[c++11] ICE with inheriting
                   |constructors and wrong      |constructors and wrong
                   |usage of constexpr          |usage of constexpr
      Known to fail|                            |4.8.0, 4.9.0

[Bug c++/60389] New: [4.8/4,9 Regression] ICE with inheriting constructors and wrong usage of constexpr

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

            Bug ID: 60389
           Summary: [4.8/4,9 Regression] ICE with inheriting constructors
                    and wrong usage of constexpr
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The following invalid code snippet (compiled with "-std=c++11") triggers
an ICE since GCC 4.8.0:

===========================================
struct A
{
  template<typename...T> A(T...) {}
};

struct B : A
{
  using A::A;
};

constexpr B b;
===========================================

bug.cc:11:13: error: the type 'const B' of constexpr variable 'b' is not
literal
 constexpr B b;
             ^
bug.cc:6:8: note: 'B' is not literal because:
 struct B : A
        ^
bug.cc:6:8: note:   'B' is not an aggregate, does not have a trivial default
constructor, and has no constexpr constructor that is not a copy or move
constructor
bug.cc:8:12: note: 'template<class ... T> B::B(T ...)' is not usable as a
constexpr function because:
   using A::A;
            ^
bug.cc:8:12: internal compiler error: tree check: expected function_decl, have
template_decl in is_valid_constexpr_fn, at cp/semantics.c:7434
0xdc0f54 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../gcc/gcc/tree.c:9192
0x73e7f7 tree_check
        ../../gcc/gcc/tree.h:2709
0x73e7f7 is_valid_constexpr_fn
        ../../gcc/gcc/cp/semantics.c:7434
0x742fd0 explain_invalid_constexpr_fn(tree_node*)
        ../../gcc/gcc/cp/semantics.c:8019
0x73f4f2 ensure_literal_type_for_constexpr_object(tree_node*)
        ../../gcc/gcc/cp/semantics.c:7374
0x5dcddf cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:6206
0x6ce58d cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16819
0x6cfd49 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11205
0x6b3003 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11086
0x6da2d2 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:10983
0x6d8fc8 cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:10869
0x6da87a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4014
0x6da87a c_parse_file()
        ../../gcc/gcc/cp/parser.c:31590
0x7fa103 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1060
Please submit a full bug report, [etc.]

[Bug c++/60389] [4.8/4.9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |error-recovery
           Priority|P3                          |P5

[Bug c++/60389] [4.8/4.9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-03-04
           Assignee|unassigned at gcc dot gnu.org      |paolo.carlini at oracle dot com
     Ever confirmed|0                           |1

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Maybe just a STRIP_TEMPLATE issue.

[Bug c++/60389] [4.8/4.9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

--- Comment #2 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Tue Mar 11 17:34:32 2014
New Revision: 208491

URL: http://gcc.gnu.org/viewcvs?rev=208491&root=gcc&view=rev
Log:
/cp
2014-03-11  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/60389
    * method.c (get_inherited_ctor): New.
    * cp-tree.h (get_inherited_ctor): Declare it.
    * semantics.c (is_valid_constexpr_fn): Use it.

/testsuite
2014-03-11  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/60389
    * g++.dg/cpp0x/inh-ctor19.C: New.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/inh-ctor19.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/method.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/60389] [4.8/4.9 Regression] [c++11] ICE with inheriting constructors and wrong usage of constexpr

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60389

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
           Assignee|paolo.carlini at oracle dot com    |unassigned at gcc dot gnu.org
   Target Milestone|4.8.3                       |4.9.0

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed for 4.9.0.