Re: 3.2.0 release candidate 5: problems with blas/lapack

[Jean-Francois Cardoso]

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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