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Re: autoconf, Fortran, LAPACK, and AC_SEARCH_LIBS
From: |
David A. Ventimiglia |
Subject: |
Re: autoconf, Fortran, LAPACK, and AC_SEARCH_LIBS |
Date: |
Wed, 25 Mar 2009 15:17:35 -0700 |
Thanks! I will consider contributing fixes...if I manage to create
fixes.
Cheers,
David
On Tue, 2009-03-24 at 21:06 -0400, John W. Eaton wrote:
> On 24-Mar-2009, David A. Ventimiglia wrote:
>
> | I think I solved one of my problems. Evidently, there's an Autoconf
> | macro AC_LANG. By adding AC_LANG(Fortran) to my configure.ac file, it
> | ensures that test programs are written in Fortran rather than in C, and
> | that seems sufficient to find sgetrf in liblapack.
> |
> | Now, onto the next issue! Which is this:
> |
> | The reference implementation of LAPACK is relatively simple. I just have
> | to link my application using -llapack, and it works.
> |
> | The Intel MKL implementation is in pieces, with dependencies. On a
> | 64-bit platform, I have to link using -lmkl_lapack -lmkl_em64t -lguide
> | -lpthread.
> |
> |
> | First, how do I get the AC_SEARCH_LIBS([sgetrf],[lapack mkl_lapack])
> | test to work? After all, in order to work, the test program that
> | AC_SEARCH_LIBS writes would have also to link to mkl_em64t, guide, and
> | pthread, otherwise it gets 'undefined reference' to functions in those
> | files, the link step fails, and it concludes that it has not found
> | sgetrf (which is in mkl_lapack).
> |
> | Second, how do I pass all this information onto the generated Makefile?
> | After all, when using the reference lapack, I want only -llapack in the
> | link line. When using Intel MKL, I want -lmkl_lapack -lmkl_em64t
> | -lguide -lpthread.
>
> I recommend using the acx_blas and acx_lapack macros from the Autoconf
> macro archive: http://autoconf-archive.cryp.to
>
> Direct links to the macros you'll need:
>
> http://autoconf-archive.cryp.to/acx_blas.html
> http://autoconf-archive.cryp.to/acx_lapack.html
> http://autoconf-archive.cryp.to/acx_blas_f77_func.html
>
> But although the macros from the archive try to find blas functions in
> -lmkl, they don't seem to know about the other libraries you mention.
> If those are actually needed, then maybe it would be good if you could
> contribute fixes for the existing macros.
>
> jwe
>
>
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