[gmx-developers] OpenMP call in a c++ analysis source file

[Jochen Hub]

Hi Teemu,

thanks for the help. I'll give it a try.

Cheers,
Jochen

Am 9/6/13 8:18 PM, schrieb Teemu Murtola:
> Hi,
> 
> 
> On Fri, Sep 6, 2013 at 12:23 PM, Jochen Hub <jhub at gwdg.de
> <mailto:jhub at gwdg.de>> wrote:
> 
>     I have added OpenMP support to g_wham and pushed the change to gerrit. I
>     get errors such as:
> 
>     undefined reference to `gmx_omp_set_num_threads(int)'
> 
>     or
> 
>     unresolved external symbol "int __cdecl gmx_omp_get_max_threads(void)"
>     (?gmx_omp_get_max_threads@@YAHXZ) referenced in function gmx_wham
> 
>     The code compiles fine under Mac and linux (without and with OpenMP
>     support).
> 
> 
> Sounds suspicious, given that Jenkins fails to build it in all
> combinations that have OpenMP enabled. 
> 
>     However, what is also strange is that I have to protect the
>     mx_omp_set_num_threads() and gmx_omp_get_max_threads() with an #ifdef
>     GMX_OPENMP - while this is not required in, for instance in gmx_sans.c.
>     The only reason I could think of is a C vs. C++ issue.
> 
>     Can someone give a hint how to proceed?
> 
> 
> You need to add extern "C" declarations to gmx_omp.h. See other header
> files for examples.
> 
> Best regards,
> Teemu
> 
> 

-- 
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Dr. Jochen Hub
Computational Molecular Biophysics Group
Institute for Microbiology and Genetics
Georg-August-University of Göttingen
Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany.
Phone: +49-551-39-14189
http://cmb.bio.uni-goettingen.de/
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