[Bug c++/20547] New: undefined reference to "static const" fields of classes

[Hu dot YuehWei at gmail dot com]

The sample codes¡G
==========================================
#include <iostream>
#include <vector>

struct T
{
  static char const a = 3;
};

std::vector<char> ddd;

int
main()
{
  ddd.push_back(T::a); /* this line of codes trigger the errors */

  std::cerr << ddd.front() << std::endl;

  return 0;
}
========================================

gcc-3.0.x 3.2.x 3.3.x 3.4.x compile the above program will produce errors like this:
=======================================
/tmp/ccPOPHZ6.o(.text+0x124): In function `main':
: undefined reference to `T::a'
collect2: ld returned 1 exit status
=======================================

However, if I use gcc-2.95, then there will be no errors.

If I modify the codes from:

...
ddd.push_back(T::a);
...

to

...
ddd.push_back(static_cast<char>(T::a));
...

then gcc-3.0.x 3.2.x 3.3.x 3.4.x will be fine.

Is this a bug in gcc 3.x?

-- 
           Summary: undefined reference to "static const" fields of classes
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Hu dot YuehWei at gmail dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20547