[Rd] --enable-BLAS-shlib conflict with --with-lapack in configure?

[Prof Brian Ripley]

This is intentional.  Please note what the R-admin manual says about
--with-lapack, including 'definitely *not* recommended'

If you are concerned about performance you definitely do not want to use 
shared R, not a shared BLAS.

On Thu, 3 Jul 2008, Bjørn-Helge Mevik wrote:

> Dear developeRs,
>
> I'm trying to build R (2.7.1, on an x86_64 running Linux, but I believe
> I have observed this on x86 and with earlier versions of R as well)
> using external BLAS and LAPACK libraries _and_ generating libR.so,
> libRblas.so and libRlapack.so.
>
> Without --enable-BLAS-shlib, configure is able to find and use the
> external LAPACK library:
>
> ./configure \
>  --with-blas="-L/site/intel/cmkl/8.1/lib/em64t -lmkl -lvml -lguide -lpthread" \
>  --with-lapack="-L/site/intel/cmkl/8.1/lib/em64t -lmkl_lapack64 -lmkl" \
>  --enable-R-shlib
> [...]
>  External libraries:        readline, BLAS(generic), LAPACK(generic)
>  Additional capabilities:   PNG, JPEG, iconv, MBCS, NLS
>  Options enabled:           shared R library, R profiling, Java
>
> However, if I add --enable-BLAS-shlib, the external LAPACK will not be
> used:
>
> ./configure \
>  --with-blas="-L/site/intel/cmkl/8.1/lib/em64t -lmkl -lvml -lguide -lpthread" \
>  --with-lapack="-L/site/intel/cmkl/8.1/lib/em64t -lmkl_lapack64 -lmkl" \
>  --enable-R-shlib --enable-BLAS-shlib
> [...]
> checking for zgeev_ in -L/site/intel/cmkl/8.1/lib/em64t -lmkl_lapack64 -lmkl... no
> checking for zgeev_ in -llapack... no
> [...]
>  External libraries:        readline, BLAS(generic)
>  Additional capabilities:   PNG, JPEG, iconv, MBCS, NLS
>  Options enabled:           shared R library, shared BLAS, R profiling, Java
>
>> From config.log, it seems configure is trying to link with libRblas when
> testing for LAPACK -- but that has not been built yet:
>
> configure:37825: checking for zgeev_
> configure:37889: gcc -std=gnu99 -o conftest -g -O2 -fpic  -I/usr/local/include  -L/usr/local/lib64 conftest.c
> -L$(R_HOME)/lib$(R_ARCH) -lRblas  -lg2c -lm -ldl -lm  >&5
> /usr/bin/ld: cannot find -lRblas
> [...]
> configure:37924: checking for zgeev_ in -L/site/intel/cmkl/8.1/lib/em64t -lmkl_lapack64 -lmkl
> configure:37962: gcc -std=gnu99 -o conftest -g -O2 -fpic  -I/usr/local/include  -L/usr/local/lib64 conftest.c
> -L/site/intel/cmkl/8.1/lib/em64t -lmkl_lapack64 -lmkl -L$(R_HOME)/lib$(R_ARCH) -lRblas  -lg2c -lm -ldl -lm  >&
> 5
> /usr/bin/ld: cannot find -lRblas
> [...]
> configure:37993: checking for zgeev_ in -llapack
> configure:38036: gcc -std=gnu99 -o conftest -g -O2 -fpic  -I/usr/local/include  -L/usr/local/lib64 conftest.c
> -llapack  -L$(R_HOME)/lib$(R_ARCH) -lRblas  -lg2c -lm -ldl -lm  >&5
> /usr/bin/ld: cannot find -lRblas
>
> (Removing the --enable-R-shlib does not make a difference in this
> respect.)
>
> Is this intentional or a bug?  Am I doing something wrong here?
>
> -- 
> Regards,
> Bjørn-Helge Mevik
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595