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From: "Kris Warkentin" <kewarken@qnx.com>
To: <gdb@sources.redhat.com>
Subject: gnu-v3-abi.c: problems w/ virtual base class
Date: Wed, 30 Oct 2002 09:10:00 -0000
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Hello,

We're porting gdb 5.2.1 to our toolchain and I'm noticing a problem with
inherited virtual base classes.

Given:

class vA {
public:
int va;
int vx;
};

class vB : public virtual vA {
public:
int vb;
int vx;
};

vB g_vB;

we get the failure:

Expected output:
(gdb) print g_vB
$73 = {<vA> = {va = 3, vx = 4}, _vb$vA = 0x80422a4, vb = 5, vx = 6}
(gdb)

Output given:
(gdb) print g_vB
$67 = {Expected a negative vbase offset (old compiler?)
(gdb)

Now I looked at the comment for this in gnu-v3-abi.c and I'm guessing the
issue has to do with the fact that we're using gcc-2.95.3.  I'm thinking
that, because this worked with gdb-5.0, it's probably a configuration error
in how we build gdb.  Can anyone tell me anything about the c++ abi stuff
and if there's any way to make it play nicely with an older gcc?

cheers,

Kris