[Bug c++/28438] New: Anon namespace pointers in exported classes

[Bug c++/28438] New: Anon namespace pointers in exported classes

[jakub at gcc dot gnu dot org]

Both KDE and OOo fail to build with the anon namespace not exported changes.
A short testcase of what they are doing:
cat > test.h <<EOF
namespace { struct A {}; }
struct B
{
  A *a;
  B ();
};
EOF
cat > test1.C <<EOF
#include "test.h"

B::B () : a(0)
{
}

B b;

int
main (void)
{
}
EOF
cat > test2.C <<EOF
#include "test.h"

B c;
EOF
g++ -c test1.C
g++ -c test2.C
g++ -o test test1.o test2.o
This doesn't link with GCC head, because B::B() constructor is a local symbol
in test1.s.

My understanding is that this is a [basic.def.odr]/5 violation, as
lthough each definition consists of the same sequence of tokens,
corresponding names (in this case A) don't refer to the same entity
(as A's definition in anonymous namespace means it is a different thing
in each translation unit), but I'd like some confirmation about this.


-- 
           Summary: Anon namespace pointers in exported classes
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28438

[Bug c++/28438] Anon namespace pointers in exported classes

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-07-19 15:45 -------
B violates ODR rules as the class for A is different between the TUs as it is
in an anon namespace.

See PR 28360 for full details.

*** This bug has been marked as a duplicate of 28360 ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28438

[Bug c++/28438] Anon namespace pointers in exported classes

[jason at redhat dot com]

------- Comment #2 from jason at redhat dot com  2006-07-19 20:02 -------
Subject: Re:   New: Anon namespace pointers in exported classes

Yes, this is an ODR violation.  However, the patch I'm working on will 
allow it to compile (as a side effect of other desired changes).

Jason


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28438