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Date: Tue, 16 Jan 2007 02:18:00 -0800 (PST)
From: George <zingafriend AT yahoo DOT com>
Subject: RE: Link errors related to vtable
To: cygwin AT cygwin DOT com
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Or, since I am suspecting this might be a problem with
the gnu c++ compiler ver 3.4.4 which is there in the
cygwin 1.5.23 is there a way that I can download the
4.1 version of the c++ compiler which might solve the
problem?

thanks

--- George <zingafriend AT yahoo DOT com> wrote:

> Hi Dave,
> I am sorry as I am new to c++ I need more help in
> doing what you said is required.
> 
> thanks
> 
> --- Dave Korn <dave DOT korn AT artimi DOT com> wrote:
> 
> > On 10 January 2007 13:04, Eric Blake wrote:
> > 
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA1
> > > 
> > > According to George on 1/9/2007 11:02 PM:
> > >> Hi,
> > >> I am getting link errors like below when I
> > compile my
> > >> code(systemc) which is  on cygwin 1.5.23 with
> gcc
> > >> 3.4.4
> > >> (systemc is a c++ class library)
> > > 
> > > No wonder.  C++ code MUST be compiled with g++,
> > not gcc (unless you REALLY
> > > know what you are doing).
> > 
> >   I guess George does, since...
> > 
> > On 10 January 2007 06:03, George wrote:
> > 
> > >
> >
>
-------------------------------------------------------
> > > g++ -O3 -Wall -I. -I.. -I../../../include -L.
> -L..
> > > -L../../../lib-linux -o run.x packet.o
> > > packet_generator.o hub.o main.o -lsystemc -lm 
> > 2>&1 |
> > > c++filt
> > >
> >
>
main.o:main.cpp:(.text$_ZN11packet_fifoC1EN7sc_core14sc_module_nameE[packet_fi
> > fo::packet_fifo(sc_core::sc_module_name)]+0x91):
> > > undefined reference to `VTT for packet_fifo'
> > 
> >   George, this will be hard for me to diagnose
> > without an STC.  The first
> > thing you should do is read "6.4 Vague Linkage" in
> > the gcc manual which
> > explains how and when gcc decides to emit the
> vtable
> > for a class; then try
> > running nm over the object files and seeing if
> it's
> > there in the expected one
> > or not.  Maybe there's a link-ordering problem or
> > something.
> > 
> >   If you can produce an STC based only on snippets
> > of main and packet_fifo I'd
> > be able to figure it out in more detail.
> > 
> >     cheers,
> >       DaveK
> > -- 
> > Can't think of a witty .sigline today....
> > 
> > 
> > --
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> > 
> 
> 
> 
> 
>  
>
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