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Date: Tue, 13 Feb 2001 13:09:17 -0500
To: Josifovski Ljubomir-BLJ01Z <BLJ01Z AT motorola DOT com>,
        "Cygwin Mailing List (E-mail)" <cygwin AT sourceware DOT cygnus DOT com>
From: "Larry Hall (RFK Partners, Inc)" <lhall AT rfk DOT com>
Subject: RE: QT
Cc: "'l DOT josifovski AT dcs DOT shef DOT ac DOT uk'" <l DOT josifovski AT dcs DOT shef DOT ac DOT uk>,
        "'j DOT barker AT dcs DOT shef DOT ac DOT uk'" <j DOT barker AT dcs DOT shef DOT ac DOT uk>
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At 12:45 PM 2/13/2001, Josifovski Ljubomir-BLJ01Z wrote:

>Not directly related to QT, but maybe someone can help me.
>
>I'm trying to link an application I need with a library libqtai that uses
>libqt and libGL (found in xfree/contrib/sgi-opengl.tar.bz2). When I try to
>link my application with the libraries, ex:
>
>$ g++       -I.  -I /home/ljupco/CTK/include/ctk  -Wall -O2   -D_HAS_QT
>-D_HAS_CURSES -o /home/ljupco/CTK/local/bin/CTKScript
>/home/ljupco/CTK/lib/CTKScript.o my_blocks.o my_translation_table.o
>-L/home/ljupco/CTK/lib -L/usr/local/qt/lib -L/usr/X11R6/lib -lctk
>/usr/local/qtai/lib/libqtai.a -lqt -lm -lcurses -lXmu -lXext -lSM -lICE
>-lGLU -lglut -lX11 -lGL
>
>I get error like:
>
>/usr/local/qtai/lib/libqtai.a(aiplot3d.o)(.text+0x5a26): undefined reference
>to `glPushMatrix AT 0'
>
>I see that libqtai needs:
>
>$ nm /usr/local/qtai/lib/libqtai.a|grep  glPushMatrix
>          U _glPushMatrix AT 0
>
>(also 
>
>$ nm /usr/local/qtai/aiplot3d.o |grep  glPushMatrix
>          U _glPushMatrix AT 0
>)
>
>While libGL provides:
>
>$ nm /usr/X11R6/lib/libGL.a |grep glPushMatrix
>00000000 I ___imp_glPushMatrix
>00000000 I __imp__glPushMatrix
>00000000 T _glPushMatrix
>
>(also 
>
>$ nm /usr/X11R6/static-lib/libGL.a |grep glPushMatrix
>00004ab8 T _glPushMatrix
>
>)
>
>Is this the names mangling thingy that c++ ("@parameters-derived-signature")
>does versus the way c does it ("_" before the name)? But I see that the
><GL/glut.h> header included from aiplot3d.cpp (and the headers it includes)
>have the "#ifdef __cpluplus extern "C" {" stuff. So where does @0 (in "U
>_glPushMatrix AT 0") come from?
>
>The metacompiler (moc) is used while creating the libqtai creating
>moc_aiplot3d.cpp. Can this be the problem?


This is an issue with calling conventions.  See:

http://msdn.microsoft.com/library/devprods/vs6/visualc/vccore/_core___cdecl.htm
http://msdn.microsoft.com/library/devprods/vs6/visualc/vccore/_core___stdcall.htm




Larry Hall                              lhall AT rfk DOT com
RFK Partners, Inc.                      http://www.rfk.com
118 Washington Street                   (508) 893-9779 - RFK Office
Holliston, MA 01746                     (508) 893-9889 - FAX



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