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* [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
@ 2011-07-21  9:18 fuchsia.groan at virgin dot net
  2011-08-02 15:03 ` [Bug c++/49803] " redi at gcc dot gnu.org
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: fuchsia.groan at virgin dot net @ 2011-07-21  9:18 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

           Summary: [C++0x] erroneous variant-member initialization in a
                    union containing an anonymous struct
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: fuchsia.groan@virgin.net


/* The output of this code should be 'Y'.  But define SHOW_BUG and it becomes
X: */
#define SHOW_BUG
#include <cstdio>
struct X
{
    X() : m_value {'X'} {}

    char m_value;
};


union Y
{
    // N3291=11-0061 12.6.2/8 says no initialization of
    // of other variant members (i.e. m_x) should
    // be performed.
    Y( char c )
        : m_char1{ c }

        { }

#ifdef SHOW_BUG
    struct
    {
#endif    
        char m_char1;
#ifdef SHOW_BUG
    };
#endif

    X    m_x;
};

int main()
{
    Y y ( 'Y' ); 

    printf( "%c\n", y.m_char1 ); // expected 'Y', get 'X'...
    return 0;
}


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug c++/49803] [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
  2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
@ 2011-08-02 15:03 ` redi at gcc dot gnu.org
  2011-08-02 18:34 ` jason at gcc dot gnu.org
                   ` (3 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2011-08-02 15:03 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.08.02 15:03:07
                 CC|                            |jason at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-08-02 15:03:07 UTC ---
Confirmed, this reduced test should not abort but does:

struct X
{
    X() { __builtin_abort(); }
};

union Y
{
    // N3291=11-0061 12.6.2/8 says no initialization of
    // of other variant members (i.e. m_x) should
    // be performed.
    Y( )
        : m_char1{ }
        { }

    struct
    {
        char m_char1;
    };

    X    m_x;
};

int main()
{
    Y y;
}


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug c++/49803] [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
  2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
  2011-08-02 15:03 ` [Bug c++/49803] " redi at gcc dot gnu.org
@ 2011-08-02 18:34 ` jason at gcc dot gnu.org
  2011-08-02 21:09 ` jason at gcc dot gnu.org
                   ` (2 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: jason at gcc dot gnu.org @ 2011-08-02 18:34 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-02 18:33:44 UTC ---
Agreed.  But note that the standard doesn't include anonymous structs, so this
is not a pedantically conforming program.


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug c++/49803] [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
  2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
  2011-08-02 15:03 ` [Bug c++/49803] " redi at gcc dot gnu.org
  2011-08-02 18:34 ` jason at gcc dot gnu.org
@ 2011-08-02 21:09 ` jason at gcc dot gnu.org
  2011-08-03  1:29 ` jason at gcc dot gnu.org
  2011-08-03  1:29 ` jason at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: jason at gcc dot gnu.org @ 2011-08-02 21:09 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-02 21:09:02 UTC ---
Author: jason
Date: Tue Aug  2 21:08:57 2011
New Revision: 177213

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177213
Log:
    PR c++/49803
    * init.c (sort_mem_initializers): Initialize uses_unions_p here.
    (build_field_list): Not here.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/union5.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/init.c
    trunk/gcc/testsuite/ChangeLog


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug c++/49803] [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
  2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
                   ` (2 preceding siblings ...)
  2011-08-02 21:09 ` jason at gcc dot gnu.org
@ 2011-08-03  1:29 ` jason at gcc dot gnu.org
  2011-08-03  1:29 ` jason at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: jason at gcc dot gnu.org @ 2011-08-03  1:29 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-03 01:25:28 UTC ---
Author: jason
Date: Wed Aug  3 01:25:25 2011
New Revision: 177226

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177226
Log:
    PR c++/49803
    * init.c (sort_mem_initializers): Initialize uses_unions_p here.
    (build_field_list): Not here.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/union5.C
Modified:
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/init.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog


^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug c++/49803] [C++0x] erroneous variant-member initialization in a union containing an anonymous struct
  2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
                   ` (3 preceding siblings ...)
  2011-08-03  1:29 ` jason at gcc dot gnu.org
@ 2011-08-03  1:29 ` jason at gcc dot gnu.org
  4 siblings, 0 replies; 6+ messages in thread
From: jason at gcc dot gnu.org @ 2011-08-03  1:29 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49803

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.2

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-03 01:27:05 UTC ---
Fixed for 4.6.2.


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-08-03  1:29 UTC | newest]

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2011-07-21  9:18 [Bug c++/49803] New: [C++0x] erroneous variant-member initialization in a union containing an anonymous struct fuchsia.groan at virgin dot net
2011-08-02 15:03 ` [Bug c++/49803] " redi at gcc dot gnu.org
2011-08-02 18:34 ` jason at gcc dot gnu.org
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