[Numpy-discussion] f2py and openmp on mac os x with gfortran

[Brandt Belson]

Hi all,
As Juan said, I didn't include the -lgomp flag for f2py. Once I use that,
the f2py module works with openMP as expected.
Thanks,
Brandt


>
> Message: 1
> Date: Thu, 21 Jul 2011 11:34:13 +0200
> From: Juan <fiolj at yahoo.com>
> Subject: Re: [Numpy-discussion] f2py and openmp on mac os x with
>        gfortran
> To: numpy-discussion at scipy.org
> Message-ID: <4E27F295.8050305 at yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> Hi Brandt, I am on linux and see the same problem. It is solved (at least
> here)
> if you add at the end the library libgomp, i.e:
> f2py -c -m play play.f90 --fcompiler=gfortran --f90flags="-fopenmp" -lgomp
> Hope it helps,
>     Juan
>
> > Hello,
> > I'm struggling to create openmp subroutines. I've simplified the problem
> > down to the subroutine below.
> >
> > -- play.f90 --
> > subroutine step(soln,n)
> >   implicit none
> >   integer n,i
> >   real*8 soln(n)
> >
> >   !f2py intent(in) n
> >   !f2py intent(out) soln
> >   !f2py depend(n) soln
> >
> > !$OMP PARALLEL DO
> >   do i=1,n
> >     soln(i) = .1
> >   end do
> > !$OMP END PARALLEL DO
> > end subroutine step
> >
> >
> > I compile this with the command:
> >
> > f2py -c -m play play.f90 --fcompiler=gfortran --f90flags="-fopenmp"
> >
> > This completes successfully. When I import the module, I get the
> following
> > error message.
> >
> > $ python -c 'import play'
> > Traceback (most recent call last):
> >   File "<string>", line 1, in <module>
> > ImportError: dlopen(./play.so, 2): Symbol not found: _GOMP_parallel_end
> >   Referenced from: /home/bbelson/Desktop/SOR/play.so
> >   Expected in: flat namespace
> >  in /home/bbelson/Desktop/SOR/play.so
> >
> > It seems to me that the linking step is broken, however I did not see any
> > other options in the f2py documentation to change the linking step. Did I
> > miss something?
> >
> > Thanks,
> > Brandt
>
>
>
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