[Worldforge-all-lists] Re: [WF-Server] STAGE and the recent problems with linking.

[Karsten <kl...@rh...>]

Rakshasa schrieb:
> 
> Twice i've had problems with using classes in shepherd, once with
> Pan::EntityAccessor, and once with the Matrix3D. The first one magically
> disappared, the second one gave me a limited insight into the problem.
> 
> It seems that if you want to use a class implemnted in one of the *.a
> file, in one of the *.a files. Then the class must be initialised in
> atleast one of the *.o files. This problem doesn't show up until you try
> to use a class implemented in a *.a file that uses an affected class.
> 
> Hope this makes sense;)
> 

I ran across the same problem several times. It is the linker which does
cause this, as it only copies those parts of code from the libraries
into the final binary which gets actually called from his point of view. 
And the linker will constantly do this wrong in our sense, if you only
call the baseclass' methods from the main program, which is common and
good practice in OO design. 
So the linker "sees" no calls to any derived classes and omits their
code in the final link.

The only solution which I have found so far is to link all libraries
dynamically, because .so files are always completely loaded into memory
and thus our wanted code is there :)

I guess, but I am not sure, that there must be a linker option so that
it does not throw away any code but simply copies the library completely
into the final binary. 

I hope this helps (a bit).


-- 
Karsten-O. Laux
kl...@rh...

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