Re: error loading cxx local model in isis: undefined symbol

Hi Maurice,

I tried to get it working with your wrapper. However, I got the same 
error again. Then I tried with simply this function below (without the 
C++ RealArray&):

#include <stdio.h>
#include <xsTypes.h>

extern "C" void test(const Real* energy, int Nflux, const Real* 
parameter, int spectrum, Real* flux, Real* fluxError, const char* init) 

{ 

  flux[Nflux] = {1.};
}

The lmodel.dat file also is also really normal.

fun       1  0.         1.e20            c_test  add  0
dummy   " "    3.    -10.    -10.    10.       10.       -0.1

What am I missing here? (By the way: I already included the 'extern "C"' 
in the first model)

Cheers,
Thomas


On 11/14/2013 04:25 PM, Maurice Leutenegger wrote:
> Hi Thomas,
>
> here is the code. You can invoke the wrapper function like this:
>
> #include "isisCPPFunctionWrapper.h"
>
> static const size_t MYXSPECMODEL_N_PARAMETERS (anIntegerConstant); //
> This is the number of parameters in your model as specified in lmodel.dat
>
> void myXSPECmodel
> (const RealArray& energy, const RealArray& parameter, int spectrum,
>   RealArray& flux, RealArray& fluxError, const string& init)
> {
>   ...
> }
>
> void myXSPECmodel_isis
> (const Real* energy, int Nflux, const Real* parameter, int spectrum,
>   Real* flux, Real* fluxError, const char* init)
> {
>    isisCPPFunctionWrapper (energy, Nflux, parameter, spectrum, flux,
> fluxError,
>                init, MYXSPECMODEL_N_PARAMETERS, &myXSPECmodel);
>    return;
> }
>
> Cheers,
>
> Maurice
>
> On 11/14/13 4:12 PM, Thomas Dauser wrote:
>> Hi Maurice,
>>
>> yes, what you describe is exactly my problem. It would be great if you
>> could send me your source code of the wrapper.
>>
>> Thanks!
>>
>> Cheers,
>> Thomas
>>
>> On 11/14/2013 04:03 PM, Maurice Leutenegger wrote:
>>> Hi Thomas,
>>>
>>> if you have declared your XSPEC local model function prototypes as "C++
>>> style", i.e. using RealArray&s instead of Real*s, then you won't be able
>>> to use them even if the "extern C" linkage problem is fixed, since the
>>> function explicitly includes C++ objects in the interface to isis. I
>>> solved this problem by writing a wrapper function and then using the
>>> wrapper to create an isis alias function for each of my local models,
>>> e.g. myLocalModel (C++ inputs)-> myLocalModel_isis (C inputs). If this
>>> is useful to you, let me know and I will send you the source code for
>>> the wrapper.
>>>
>>> Cheers,
>>>
>>> Maurice
>>>
>>>
>>> On 11/14/13 3:45 PM, John Houck wrote:
>>>> On Wed, Nov 13, 2013 at 15:07 -0500, Thomas Dauser wrote:
>>>>> Dear isis-users,
>>>>>
>>>>> did anyone experience problems including a cxx local model in isis?
>>>>>
>>>>> Here is my problem: I compile it once with xspec:
>>>>>
>>>>> initpackage fun_test lmodel.dat .
>>>>>
>>>>> While I can load (and evaluate) it in xspec without errors:
>>>>>
>>>>> XSPEC12>lmod fun_test .
>>>>> Model package fun_test successfully loaded.
>>>>>
>>>>> however, for the same model library (without any recompiling), isis
>>>>> complains with
>>>>>
>>>>> isis> load_xspec_local_models (".");
>>>>> Loading ././libfun_test.so
>>>>> Error loading symbol C_test for model fun
>>>>> Link error: ././libfun_test.so: undefined symbol: C_test
>>>>>
>>>>> And isis is somehow right, as C_test is not defined ("nm -D
>>>>> libfun_test.so | grep C_test" does not give a result).
>>>> Since isis is (usually compiled as) a C program and not a C++
>>>> program, your model must export a "C" linkage symbol for isis
>>>> to link to.
>>>>
>>>> What output does this produce?:
>>>>     nm libfun_test.so
>>>>
>>>> The C++ symbols are usually "mangled" containing embedded
>>>> interface that describes the subroutine interface.
>>>> Probably your library contains only a C++ interface.
>>>>
>>>> To provide a C-linkage symbol, your C++ interface must
>>>> provide an interface declared as extern "C" (and that also
>>>> follows the Xspec interface naming conventions).
>>>>
>>>> Thanks,
>>>> -John
>>>>
>>>>> What am I missing here? Is there a difference, how I need to treat
>>>>> xspec and isis local models? I know that the "C_" has to be included
>>>>> in the lmodel.dat file to tell xspec/isis that this is C/C++ code
>>>>> and not fortran.
>>>>>
>>>>> I have the latest isis version 1.6.2-27 and heasoft 6.14 installed.
>>>>>
>>>>> Thanks for your help.
>>>>>
>>>>> Cheers,
>>>>> Thomas
>>>>>
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