[Qt-interest] Fwd: Fwd: Fwd: qmake and staticlib issue

[ami guru]

If i forward declare a class then i only use the reference or pointer for
that class and we do not instantiate any object of that class.

That what  the theory says and i have used that accordingly.


In the GLWidget.h clas i have used the forward declared a class named
GLRender since i am using the pointer of its type.

In thr GLWidget.cpp file i am creating a object of GLRender with  the new
operator and there i have included the GLRender.h

It should not complain.

But it does.


Would like to know why?


Regards
Sajjad

---------- Forwarded message ----------
From: John McClurkin <jwm at nei.nih.gov>
Date: Tue, Apr 21, 2009 at 2:23 PM
Subject: Re: [Qt-interest] Fwd: Fwd: qmake and staticlib issue
To: qt-interest at trolltech.com


ami guru wrote:
> Hello Farid,
>
> Thanks a lot for the feedback.
>
> I have tried the absolute path instead of the relative one and it works
> fine now.
>
>
> Now i have another error which i think will be off-topic to bring up here.
>
>
> I am getting the error saying that
>
>
> invalid use of the incomplete type.
>
> When do we have these type of error?
This usually occurs when you forward declare a class but don't include
the header.

>
>
> Regards
> Sajjad
>
> On Mon, Apr 20, 2009 at 6:35 PM, Farid Derradji
> <farid.derradji at itwm.fraunhofer.de
> <mailto:farid.derradji at itwm.fraunhofer.de>> wrote:
>
>     Hello Sajjad,
>
>     Perhaps you should first check whether your compiled libraries contain
>     all required symbols (methods):
>
>     objdump --demangle --syms libVrMath.a          > libVrMath.txt
>     objdump --demangle --syms libDataStructs.a     > libDataStructs.txt
>     objdump --demangle --syms libOpenGLRender.a    > libOpenGLRender.txt
>     objdump --demangle --syms libRaytraceMgr.a     > libRaytraceMgr.txt
>     objdump --demangle --syms libGraphics.a        > libGraphics.txt
>
>     Hereby *objdump* is a pretty useful tool of the *binutils* collection.
>     Note that you need the debug versions of your libraries if you want to
>     use Option --syms.
>
>
>     Regards
>     Farid
>
>
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