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Re: 3.2.0 release candidate 5: problems with blas/lapack
From: |
Jean-Francois Cardoso |
Subject: |
Re: 3.2.0 release candidate 5: problems with blas/lapack |
Date: |
Wed, 3 Jun 2009 15:20:41 -0700 (PDT) |
Rob Mahurin wrote:
>
> On Jun 2, 2009, at 4:30 PM, Jean-Francois Cardoso wrote:
>> Hello Jaroslav,
>>
>> I have problem building all 3.2.0 release candidates.
>> The configure script does not detect properly the
>> BLAS libraries. This is happening on two machines of mine:
>>
>> 1) on my MacBook where ./configure spills out:
>>
>> [...]
>> checking whether DDOT is called correctly from Fortran... yes
>> checking whether CDOTU is called correctly from Fortran... no
>> checking whether ZDOTU is called correctly from Fortran... yes
>> configure: WARNING: A BLAS library was detected but found
>> incompatible with
>> your Fortran 77 compiler.
>> [...]
>
> I had this problem while using the compiler "g95" that shipped with
> OSX 10.5.7. I got around it by installing gcc44 from macports and
> calling configure with
>
> ./configure LDFLAGS=-L/opt/local/lib LIBS=-lmetis \
> FFLAGS=-ff2c F77=gfortran-mp-4.4 \
> CC=gcc-mp-4.4 CXX=g++-mp-4.4
>
>>
>
> You seem to be doing something more complicated than I am with BLAS
> libraries, but hopefully this helps anyway.
>
>
Thanks for your reply. Indeed, the BLAS detection problem is solved
by adding the ff2c switch. This works on both MacOSX
and on a Linux+MKL system. No test failures on Linux+MKL
but several on MacOSX, which I will report separately.
I am wondering if the ff2c switch induces some loss
of efficiency. If not, why is it not "on" by default; if yes,
any idea about the possible loss ? (this is out of curiosity).
Thanks again, JF
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