[Trilinos-Users] BLAS/LAPACK automatically linked by compiler

[Nico Schlömer]

Hm. Doing this

  -D TPL_ENABLE_BLAS:BOOL=ON \
      -D TPL_BLAS_LIBRARIES="" \

yields this

-- Processing enabled TPL: BLAS
--   Searching for library 'blas' ...
--   Searching for library 'blas_win32' ...
--   Warning: Could not find a library in the set "blas blas_win32"
for the TPL BLAS!  Please manually set BLAS_LIBRARY_DIRS and/or
BLAS_LIBRARY_NAMES or just TPL_BLAS_LIBRARIES to point to the BLAS
libraries!

--Nico

On Mon, Sep 10, 2012 at 6:02 PM, Antonio Cervone <ant.cervone at gmail.com> wrote:
> hi Nico,
> one way to go around this problem is to explicitly set the internal
> variable that tribits uses to link the library, i.e.
>
> TPL_BLAS_LIBRARIES
> TPL_BLAS_INCLUDE_DIRS
>
> if you set them to empty you should avoid the double linking.
> bye
>
> antonio
>
>
>
> On Mon, Sep 10, 2012 at 5:54 PM, Nico Schlömer <nico.schloemer at gmail.com> wrote:
>> Hi all,
>>
>> here's a funny compiler issue.
>> On NERSC, the BLAS and LAPACK libraries are automatically included on
>> the link line by their compiler wrappers, much like libmpi.a is
>> automatically linked on many other platforms.
>> We've got outselves a little bit of a conflict of responsibilities
>> here since also CMake tries to care of BLAS and LAPACK, e.g.,
>>
>> -D TPL_ENABLE_BLAS:BOOL=ON \
>>       -D BLAS_LIBRARY_DIRS:FILEPATH="$CRAY_LIBSCI_PREFIX_DIR/lib" \
>>       -D BLAS_LIBRARY_NAMES="sci_gnu" \
>>
>> The exact library locations aren't officially disclosed, so at best
>> I'm getting BLAS and LAPACK implicitly twice on the link line. Should
>> they decide to change their BLAS/LAPACK directories in the wrappers
>> one day, however, this'll lead to two different BLAS/LAPACK libraries
>> on the link line which is less than ideal.
>>
>> What's the situation on other HPCs, and how do you deal with this?
>>
>> --Nico
>>
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