[f2py] f2py and lapack DLARUV

[Stephane Raynaud]

Since the only subroutine used from lapack is DLARUV with no
dependencies, I folowed your excellent idea :
----
f2py  -m testmod testfile.f90 -h testfile.pyf
f2py testfile.pyf dlaruv.f
---

It failed on the second phase :
---
|...]
        Block: DLARUV
Post-processing (stage 2)...
Tip: If your original code is Fortran source then you must use -m option.
[...]
TypeError: All blocks must be python module blocks but got 'subroutine'
---

However, it work using the same idea with :
----
f2py  -m testmod testfile.f90 -h testfile.pyf # setup interface only
for testfunc
f2py -c -m testmod testfile.f90 testfile.pyf dlaruv.f # build
---


Thus, this solution is sufficient for me, thanks alot !!!

However, it would be great to have a solution for the when using the
lapack/blas library itself.

On Fri, May 20, 2011 at 11:35 AM, Pearu Peterson
<pearu.peterson at gmail.com> wrote:
>
>
> On 05/20/2011 10:39 AM, Stephane Raynaud wrote:
>> Hi,
>>
>> trying to build a fortran extension linked to lapack (f77), I faced a
>> problem that I reduced to the following example.
>>
>> ------------ testfile.f90 ------------
>> subroutine testfunc
>>     integer,parameter :: n=2
>>     integer :: iseed(4)
>>     real(kind=8) :: x(n)
>>     iseed = (/0,1,3,4/)
>>     call DLARUV(iseed, n, x)
>> end subroutine testfunc
>> --------------------------------------
>>
>> Then :  f2py -c -m testmod -llapack -lblas
>> -L/home/raynaud/soft/lapack_gfortran/lib testfile.f90
>>
>> It rises the following error (using gfortran) :
>>
>>    /usr/bin/gfortran -Wall -Wall -shared
>> /tmp/tmpzBIKPf/tmp/tmpzBIKPf/src.linux-x86_64-2.6/testmodule.o
>> /tmp/tmpzBIKPf/tmp/tmpzBIKPf/src.linux-x86_64-2.6/fortranobject.o
>> /tmp/tmpzBIKPf/test.o -L/home/raynaud/soft/lapack_gfortran/lib
>> -L/soft/cdat/5.2.0/lib -llapack -lblas -lpython2.6 -lgfortran -o
>> ./test.so
>>    /usr/bin/ld:
>> /home/raynaud/soft/lapack_gfortran/lib/liblapack.a(dlaruv.o):
>> relocation R_X86_64_32S against `.data' can not be used when making a
>> shared object; recompile with -fPIC
>>    /home/raynaud/soft/lapack_gfortran/lib/liblapack.a: could not read
>> symbols: Bad value
>>
>>
>> BLAS and LAPACK where compilated with gfortran and options '-fPIC -O3'.
>
> Are you absolutely sure?
>
> Can you try creating the testmod without using lapack and blas libraries
> but their sources? For example:
>
> f2py  -m testmod testfile.f90 -h testfile.pyf
> f2py testfile.pyf /path/to/lapack/src/*.f /path/to/blas/src/*.f
>
> Pearu
>
>> I tried to use the DATA statement directly in a subroutine that I
>> converted to a python module, and it worked.
>>
>>
>> Any idea ?
>>
>> Thanks.
>>
>
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-- 
Stephane Raynaud