[Bug c++/11789] New: rejects legal, multiple inheritance (inheriting from same class twice)

[Bug c++/11789] New: rejects legal, multiple inheritance (inheriting from same class twice)

[shuki_duv at yahoo dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789

           Summary: rejects legal, multiple inheritance (inheriting from
                    same class twice)
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: shuki_duv at yahoo dot com
                CC: gcc-bugs at gcc dot gnu dot org

struct Base {
  int b;
  
  Base(int b) : b(b) { }
};

struct Derived : public Base {
  Derived(int d) : Base(d) { }
};

struct Final : public Derived, public Base {
  Final(int f) : Derived(f), Base(f-1) { }
};

int main()
{
  Final f(5);
}

gcc reports this as ambigous, although the ambiguity arises only when trying to
refer to Final via Base.

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |rejects-valid
   Last reconfirmed|0000-00-00 00:00:00         |2003-08-04 19:43:23
               date|                            |


------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-04 19:43 -------
I can confirm this on the mainline (20030804).  ICC 6.0 in strict mode (-Xc) accepted this.
GCC 2.95.3 also rejected this so this is not a regression.

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[reichelt at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789


reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
           Keywords|                            |monitored


------- Additional Comments From reichelt at gcc dot gnu dot org  2003-08-04 23:21 -------
With --enable-checking gcc even ICEs on mainline and the 3.3 branch.

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789



------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-05 02:26 -------
Related to bug 7886, most likely the same bug as the ICE is the same (for checking) and 
the error messages are the same (for nonchecking).

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[cvs-commit at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-08-11 02:49 -------
Subject: Bug 11789

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	mmitchel@gcc.gnu.org	2003-08-11 02:49:44

Modified files:
	gcc/cp         : ChangeLog cp-tree.h init.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/inherit: multiple1.C 

Log message:
	PR c++/11789
	* cp-tree.h (get_vbase): Remove.
	(get_vbase_types): Remove.
	* init.c (expand_member_init): Correct logic for looking up base
	classes.
	
	PR c++/11789.C
	* g++.dg/inherit/multiple1.C: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.3594&r2=1.3595
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/cp-tree.h.diff?cvsroot=gcc&r1=1.899&r2=1.900
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/init.c.diff?cvsroot=gcc&r1=1.336&r2=1.337
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.2964&r2=1.2965
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/inherit/multiple1.C.diff?cvsroot=gcc&r1=NONE&r2=1.1

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[mmitchel at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789


mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


------- Additional Comments From mmitchel at gcc dot gnu dot org  2003-08-11 02:58 -------
Fixed in GCC 3.4.

[Bug c++/11789] rejects legal, multiple inheritance (inheriting from same class twice)

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11789


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |catherin at ca dot ibm dot
                   |                            |com


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-11 10:50 -------
*** Bug 7886 has been marked as a duplicate of this bug. ***