[Bug c++/66644] New: Rejects C++11 in-class anonymous union members initialization

[Bug c++/66644] New: Rejects C++11 in-class anonymous union members initialization

[bisqwit at iki dot fi]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66644

            Bug ID: 66644
           Summary: Rejects C++11 in-class anonymous union members
                    initialization
           Product: gcc
           Version: 5.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bisqwit at iki dot fi
  Target Milestone: ---

Accepted by GCC:

    struct test  
    {   union  
        {
            struct { char a=0, b; };
            char buffer[16];
    };  };

NOT accepted by GCC (multiple fields in union 'test::<anonymous union>'
initialized):

    struct test  
    {   union  
        {
            struct { char a=0, b=0; };
            char buffer[16];
    };  };

Still accepted by GCC:

    struct test
    {   union
        {
            struct { char a, b; } test2{0,
            char buffer[16];
    };  };

I think there's a compiler bug here. It should not complain about initializing
multiple fields in a struct that is nested inside the union, because this does
not comprise a conflict.

Tested on GCC versions 4.7.4, 4.8.4, 4.9.2, and 5.1.1.

[Bug c++/66644] Rejects C++11 in-class anonymous union members initialization

[bisqwit at iki dot fi]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66644

--- Comment #1 from Joel Yliluoma <bisqwit at iki dot fi> ---
The last code piece should have test2{0,0}; there. Something ate a couple of
characters off the end of that line.

[Bug c++/66644] Rejects C++11 in-class anonymous union members initialization

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66644

--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The problem also exists in the current HEAD (Tested for gcc HEAD 6.0.0 20150623
(experimental))
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Subject: [Bug c++/66656] static constexpr array member: cannot get size via constexpr function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66656

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler@googlemail.
                   |                            |com

--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The compiler/linker is right: You still need to provide a definition for the
second static data member. Providing an initializer does not provide such a
definition. To fix your problem, just add the line

constexpr X::item X::arr1[];

to your code.

This is not a defect.
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Subject: [Bug c++/65919] [5/6 Regression] GCC 5.1 with options "-g -std=c++14" fails to compile multiple lambdas used as default function parameters
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide919

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed Jun 24 20:24:01 2015
New Revision: 224922

URL: https://gcc.gnu.org/viewcvs?rev"4922&root=gcc&view=rev
Log:
        PR c++/65919
        * mangle.c (mangle_decl): Always SET_IDENTIFIER_GLOBAL_VALUE.
        (decl_implicit_alias_p): Split out from maybe_remove_implicit_alias.
        * cp-tree.h (DECL_REALLY_EXTERN): Handle null DECL_LANG_SPECIFIC.

Modified:
    branches/gcc-5-branch/gcc/cp/ChangeLog
    branches/gcc-5-branch/gcc/cp/cp-tree.h
    branches/gcc-5-branch/gcc/cp/mangle.c
    branches/gcc-5-branch/gcc/testsuite/g++.dg/abi/mangle58.C

[Bug c++/66644] Rejects C++11 in-class anonymous union members initialization

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66644

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-25
     Ever confirmed|0                           |1

[Bug c++/66644] Rejects C++11 in-class anonymous union members initialization

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66644

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |paolo.carlini at oracle dot com
   Target Milestone|---                         |6.0

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