Re: Why the class is declared as undefined

From: Nick van Eijndhoven (Nick@phys.uu.nl)
Date: Mon Feb 08 1999 - 15:17:06 MET


Wei Xie wrote:
> 
> Dear Rooters,
> 
> Sometimes I met following problems:
> 
>     The shared library has been successfully built without any problem.
>     When load it into ROOT and type '.class', ROOT says the class is
>     not defined but the class is actually define in the code.
> 
> There is no any information to help to find what's going wrong in this
> case.  Could you remind me what could be the possible reason ?
> 
> Sincerely yours
> Xie

Hi Xie,
This happened to me as well and the solution was very simple.
In case you create let's say 2 shared libraries (lib1.sl and lib2.sl)
but if you used in both cases the same name for the rootcint
generated dictionary, you get exactly the problem you mention.
Simple solution :
If one creates e.g. a library lib1.sl, one should make it a rule
to call the rootcint generated dict lib1dict.cxx and lib1dict.h.
In this case every library you will create will have a unique
dictionary name and the problems are solved. 
-- 

                                              Cheers,
                                               Nick.

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