Re: gRandom access in SVN HEAD

On Mar 10, 2008, at 4:00 PM, Rene Brun wrote:

> The CINT autoload mechanism works only with class names, not with
> globals or typedefs.
> the following works
> TRandom r;
> r.Rndm();
>
> but not gRandom->Rndm().

Yes. I just wondered if there was some way to coerce CINT to treat special entries in a .rootmap file such that it handles globals (e.g. gRandom) in the same way as actual classes. I guess you're saying "it's not possible".

> We are expecting to remove this limitation in a future version of
> CINT.
If that isn't to happen all that soon, could we in the interim just have root.exe linked with "mathcore" by default.

-robert

> Rene Brun
>
> Robert Hatcher wrote:
>> Second try sending this ... hope it makes it through without
>> duplication]
>>
>> With the new handling of MathCore something seems to have gotten lost
>> in the way it handles gRandom. Now I see:
>>
>> *******************************************
>> * *
>> * W E L C O M E to R O O T *
>> * *
>> * Version 5.19/01 17 January 2008 *
>> * *
>> * You are welcome to visit our Web site *
>> * http://root.cern.ch *
>> * *
>> *******************************************
>> ROOT 5.19/01 (trunk_at_22548, Mar 10 2008, 00:33:04 on linux)
>> CINT/ROOT C/C++ Interpreter version 5.16.29, Jan 08, 2008
>>
>> root [0] gRandom->Rndm()
>> Error: Symbol gRandom is not defined in current scope (tmpfile):1:
>> Error: Failed to evaluate gRandom->Rndm()
>> *** Interpreter error recovered ***
>> root [1] gSystem->Load("libMathCore");
>> root [2] gRandom->Rndm()
>> (Double_t)9.99741748906672001e-01
>>
>> whereas in prior versions (e.g. v5.18/00a) the initial statement
>> worked.
>> Previously libCore.so had a reference to gRandom but it no longer
>> does
>> and so it fails to automatically load the libMathCore library
>> (because
>> it's not trying to resolve a TRandom class name and it knows
>> nothing about
>> "gRandom"). This is true for both Linux (SLF 3 & 4) and Mac OS X
>> (Tiger).
>>
>> Are users going to have to add gSystem->Load("libMathCore") to
>> their scripts or is there some means to get the previous behaviour
>> restored?
>> I don't fully understand the .rootmap mechanism, but would it be
>> possible
>> to use that to get the library automatically loaded for these sort of
>> globals?
>>
>> -robert
>>
>> Robert W. Hatcher | rhatcher_at_fnal.gov 630-840-3102
>> FNAL CD/EXP (MINOS) | MS 220, PO Box 500, Batavia IL 60510
>>
>

Robert W. Hatcher | rhatcher_at_fnal.gov 630-840-3102 FNAL CD/REX (MINOS) | MS 220, PO Box 500, Batavia IL 60510 Received on Tue Mar 11 2008 - 01:05:41 CET