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c++/9485: g++ 3.4: wrong class's virtual function called
- From: snyder at fnal dot gov
- To: gcc-gnats at gcc dot gnu dot org
- Date: Tue, 28 Jan 2003 12:42:24 CST
- Subject: c++/9485: g++ 3.4: wrong class's virtual function called
- Reply-to: snyder at fnal dot gov
>Number: 9485
>Category: c++
>Synopsis: g++ 3.4: wrong class's virtual function called
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Tue Jan 28 18:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: scott snyder
>Release: 3.4 20030127 (experimental)
>Organization:
<organization of PR author (multiple lines)>
>Environment:
System: Linux karma 2.4.19-emp_2419p5a829i #1 Tue Sep 3 17:42:17 EST 2002 i686 unknown
Architecture: i686
<machine, os, target, libraries (multiple lines)>
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --prefix=/usr/local/gcc --enable-threads=posix --enable-long-long
>Description:
This bug is perhaps related to the earlier c++/9415 that i reported; however,
the fix for that one does not fix this case.
In the function foofoo() in the test case below, the construction
B* type;
type -> A::construct ();
does not call A::construct as intended; rather, it calls B::construct,
as can be seen by running the program:
$ g++ -o x x.cc
$ ./x
B
$
>How-To-Repeat:
-------------------------
extern "C" int printf (...);
struct A
{
virtual void construct () { printf ("A\n"); }
};
struct B : public A
{
virtual void construct () { printf ("B\n"); }
};
void foofoo (B* type)
{
type -> A::construct ();
}
int main ()
{
foofoo (new B);
return 0;
}
-------------------------
>Fix:
<how to correct or work around the problem, if known (multiple lines)>
>Release-Note:
>Audit-Trail:
>Unformatted: