[Bug c++/17996] New: [3.4/4.0 regression] Destructor run twice

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following testcase is miscompiled on the 3.4 branch and mainline:

=========================================================
extern int printf(const char *restrict, ...) throw ();

struct A
{
    A()  { printf("Ctor\n"); }
    ~A() { printf("Dtor\n"); }
};

A a;
extern A a;

int main()
{
    return 0;
}
=========================================================

The output is:

Ctor
Dtor
Dtor

i.e. the destructor of A is run twice.
If I exchange line 9 and 10, the bug goes away.

Btw, the bug was reported at Debian:
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=260747
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=265961

The bug affects gcc 3.4.0 and later.

It was introduced somewhere in Mid August 2003.

Mark, your patch
http://gcc.gnu.org/ml/gcc-cvs/2003-08/msg00621.html
might have caused the regression. Could you please have a look?

-- 
           Summary: [3.4/4.0 regression] Destructor run twice
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,mark at codesourcery dot
                    com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17996