c++/1864: another problem with virtual derivation

[snyder@fnal.gov]

>Number:         1864
>Category:       c++
>Synopsis:       critical
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 03 14:46:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     scott snyder
>Release:        2.97 20010129 (experimental)
>Organization:
>Environment:
System: Linux karma 2.2.16-22 #1 Tue Aug 22 16:49:06 EDT 2000 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../egcs/configure --prefix=/usr/local/egcs --enable-threads=posix
>Description:

When the program below is compiled and run, it crashes:

$ g++ -g -o xidl xidl.cpp
$ ./xidl
Segmentation fault (core dumped)
$

Here's the stack trace where it crashes:

Program received signal SIGSEGV, Segmentation fault.
0x8048bd2 in _ZN20CORBA_Container_implC2EPPKv (this=0x8050ec8, 
    __vtt_parm=0x804a0d8) at xidl.cpp:16
16        new CORBA_Repository_impl();
(gdb) where
#0  0x8048bd2 in _ZN20CORBA_Container_implC2EPPKv (this=0x8050ec8, 
    __vtt_parm=0x804a0d8) at xidl.cpp:16
#1  0x8048786 in _ZN21CORBA_Repository_implC1Ev (this=0x8050eb8) at xidl.cpp:16
#2  0x80486b1 in main () at xidl.cpp:16
#3  0x400edfd1 in __libc_start_main (main=0x8048690 <main>, argc=1, 
    ubp_av=0xbfffd854, init=0x80484e8 <_init>, fini=0x8049014 <_fini>, 
    rtld_fini=0x4000e254 <_dl_fini>, stack_end=0xbfffd84c)
    at ../sysdeps/generic/libc-start.c:118



>How-To-Repeat:

This one's even from a real program (the orbacus idl compiler),
rather than a contrived test case :).

-----------------------------------------------------
class OBRefCount
{
public:
  int ref_;
  virtual ~OBRefCount() {}
};


class CORBA_Container_skel : virtual public OBRefCount {};
class CORBA_Container_impl : public virtual CORBA_Container_skel {};
class CORBA_Repository_impl : public virtual CORBA_Container_skel,
			      public virtual CORBA_Container_impl {};

int main()
{
  new CORBA_Repository_impl();
  return 0;
}


-----------------------------------------------------

>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: