[Openmp-dev] Problem in setting number of threads while using clang with openmp

[Rajat Garg]

Hi,

Thanks a lot for mentioning "-fopenmp=libomp". This works perfectly fine.
Maybe you should should mention this on http://openmp.llvm.org/. I have
been dealing with this for last two days.


Thanks,
Rajat

On Tue, Jul 14, 2015 at 5:37 PM, Andrey Bokhanko <andreybokhanko at gmail.com>
wrote:

> Hi Rajat,
>
> OpenMP 3.1 is fully upstreamed to clang / llvm trunk, so it is better
> to use trunk version (unless you have a really good reason to prefer
> one hosted on clang-omp.github).
>
> Instructions are posted on llvm blog:
> http://blog.llvm.org/2015/05/openmp-support_22.html. The only
> difference is that instead of "-fopenmp" you should use
> "-fopenmp=libomp" (this is temporary and will be fixed, but here we
> are).
>
> As for the segmentation fault you got, please try trunk version of the
> compiler and if problem won't go away, provide more details: HW and OS
> you use, how exactly you built clang, what's inside try.c, etc.
>
> Yours,
> Andrey Bokhanko
> =============
> Software Engineer
> Intel Compiler Team
> Intel
>
>
> On Tue, Jul 14, 2015 at 9:03 PM, Rajat Garg <gargx093 at umn.edu> wrote:
> > Hi,
> >
> > I am using the clang provided by polly(which is version 3.7) in
> association
> > with openmp shared library(http://openmp.llvm.org/).
> >
> > Ultimately, I have to run clang with polly on multiple threads. So, I
> tried
> > to compile a simple program with #pragma parallel. But I could not create
> > more than one thread. This was because libgomp was getting linked
> instead of
> > libomp.
> >
> > So, as suggested on https://github.com/clang-omp/clang/issues/44, I
> > downloaded the clang-omp version and following the directions as in
> > https://clang-omp.github.io/.
> >
> > ../build/bin/clang-3.5 -fopenmp
> > -L/home/rajat/lulesh/openmp/runtime/exports/lin_32e/lib/
> > -I/home/rajat/lulesh/openmp/runtime/exports/common/include try.c
> >
> > But, this gives segmentation fault with #pragma omp parallel.
> >
> > Can you help me out in this.
> >
> > Thanks,
> > Rajat
> >
> > _______________________________________________
> > Openmp-dev mailing list
> > Openmp-dev at dcs-maillist2.engr.illinois.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/openmp-dev
> >
>



-- 
Rajat
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