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Date: Tue, 16 Jan 2007 00:11:27 -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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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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