[Fwd: Re: Why the class is declared as undefined]

From: Nick van Eijndhoven (Nick@phys.uu.nl)
Date: Tue Feb 09 1999 - 09:43:44 MET 

Dear friends,
I received a mail that the cern email service to the roottalk
list has been interrupted yesterday.
I was asked to send the original mail again, so here it is.
In case you have received this mail now several times, it's
the email system to blame.
-- 

                                              Cheers,
                                               Nick.

*----------------------------------------------------------------------*
 Dr. Nick van Eijndhoven                Department of Subatomic Physics
 email : nick@phys.uu.nl                Utrecht University / NIKHEF
 tel. +31-30-2532331 (direct)           P.O. Box 80.000
 tel. +31-30-2531492 (secr.)            NL-3508 TA Utrecht
 fax. +31-30-2518689                    The Netherlands
 WWW : http://www.phys.uu.nl/~nick      Office : Ornstein lab. 172
 ----------------------------------------------------------------------
 tel. +41-22-7679751 (direct)           CERN PPE Division / ALICE exp.
 tel. +41-22-7675857 (secr.)            CH-1211 Geneva 23
 fax. +41-22-7679480                    Switzerland
 CERN beep : 13+7294                    Office : B 160 1-012
*----------------------------------------------------------------------*

attached mail follows:

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. *----------------------------------------------------------------------* Dr. Nick van Eijndhoven Department of Subatomic Physics email : nick@phys.uu.nl Utrecht University / NIKHEF tel. +31-30-2532331 (direct) P.O. Box 80.000 tel. +31-30-2531492 (secr.) NL-3508 TA Utrecht fax. +31-30-2518689 The Netherlands WWW : http://www.phys.uu.nl/~nick Office : Ornstein lab. 172 ---------------------------------------------------------------------- tel. +41-22-7679751 (direct) CERN PPE Division / ALICE exp. tel. +41-22-7675857 (secr.) CH-1211 Geneva 23 fax. +41-22-7679480 Switzerland CERN beep : 13+7294 Office : B 160 1-012 *----------------------------------------------------------------------*

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