[CMake] [EXTERNAL] A required library with BLAS API not found.

[Mitchell, John A]

 I'm not totally sure what the issue is you are having.  Make sure that you have your 'intel' environment set up.  See my .bashrc snippet below.  

It may be as simple as not having an include directory defined in your CMakeLists.txt file(s). 

Getting MKL hooked up can be something of a pain.    For what its worth, here is how I have recently made this work. 


In my .bashrc file:

export MKLROOT=/opt/intel/mkl
export MKLPATH=$MKLROOT/lib/intel64
export MKLINCLUDE=$MKLROOT/include
source ${MKLROOT}/bin/mklvars.sh intel64

In my shell script that launches cmake:

# Blas/Lapack

LAPACK_LIB_DIRS=$MKLPATH
BLAS_LIB_DIRS=$MKLPATH


In the actual cmake command:

cmake ...(whatever other command you have) \
         -D BLAS_LIBRARY_DIRS:PATH=$BLAS_LIB_DIRS \
         -D LAPACK_LIBRARY_DIRS:PATH=$LAPACK_LIB_DIRS \
....

In my CMakeLists.txt file:

    # Blas and Lapack Libraries
    find_library(Blas_LIBRARY
      NAMES mkl_blas95_lp64
      PATHS ${BLAS_LIBRARY_DIRS}
    )
    find_library(Lapack_LIBRARY
      NAMES mkl_lapack95_lp64
      PATHS ${LAPACK_LIBRARY_DIRS}
    )
    set(BlasLapack_Libraries mkl_blas95_lp64 mkl_lapack95_lp64)







________________________________________
From: cmake-bounces at cmake.org [cmake-bounces at cmake.org] on behalf of Maxime Boissonneault [maxime.boissonneault at clumeq.ca]
Sent: Wednesday, April 04, 2012 2:28 PM
To: cmake at cmake.org
Subject: [EXTERNAL] [CMake] A required library with BLAS API not found.

Hi,
I am trying to compile a code with cmake on a cluster. However, whatever
I do, cmake can not seem to find BLAS, even though BLAS is definitely
installed (MKL version) and in my LD_LIBRARY_PATH.

Please help!

Below is the output of a few commands, with the cmake output.

Thanks,

Maxime Boissonneault


[mboisson at colosse1 squack-code]$ echo $LD_LIBRARY_PATH
/software/intel/mkl/10.2.2.025/lib/em64t:/software/intel/Compiler/11.1.059/lib/intel64:/software/misc-libs/gsl/1.15_gcc/lib
[mboisson at colosse1 squack-code]$ ls /software/intel/mkl/10.2.2.025/lib/em64t
libguide.a                      libmkl_blacs_intelmpi_lp64.so
libmkl_core.a         libmkl_intel_ilp64.a
libmkl_lapack95_lp64.a     libmkl_scalapack_lp64.a
libmkl_vml_def.so
libguide.so                     libmkl_blacs_lp64.a
libmkl_core.so        libmkl_intel_ilp64.so
libmkl_lapack.so           libmkl_scalapack_lp64.so
libmkl_vml_mc2.so
libiomp5.a                      libmkl_blacs_openmpi_ilp64.a
libmkl_def.so         libmkl_intel_lp64.a
libmkl_mc3.so              libmkl_sequential.a
libmkl_vml_mc3.so
libiomp5.so                     libmkl_blacs_openmpi_lp64.a
libmkl_gf_ilp64.a     libmkl_intel_lp64.so
libmkl_mc.so               libmkl_sequential.so
libmkl_vml_mc.so
libmkl_avx.so                   libmkl_blacs_sgimpt_ilp64.a
libmkl_gf_ilp64.so    libmkl_intel_sp2dp.a
libmkl_p4n.so              libmkl_solver_ilp64.a
libmkl_vml_p4n.so
libmkl_blacs_ilp64.a            libmkl_blacs_sgimpt_lp64.a
libmkl_gf_lp64.a      libmkl_intel_sp2dp.so
libmkl_pgi_thread.a        libmkl_solver_ilp64_sequential.a  locale
libmkl_blacs_intelmpi_ilp64.a   libmkl_blas95_ilp64.a
libmkl_gf_lp64.so     libmkl_intel_thread.a
libmkl_pgi_thread.so       libmkl_solver_lp64.a
libmkl_blacs_intelmpi_ilp64.so  libmkl_blas95_lp64.a
libmkl_gnu_thread.a   libmkl_intel_thread.so
libmkl_scalapack_ilp64.a   libmkl_solver_lp64_sequential.a
libmkl_blacs_intelmpi_lp64.a    libmkl_cdft_core.a
libmkl_gnu_thread.so  libmkl_lapack95_ilp64.a
libmkl_scalapack_ilp64.so  libmkl_vml_avx.so

[mboisson at colosse1 squack-code]$ cmake .
-- CMAKE_INSTALL_PREFIX = /usr/local
-- Looking for sgemm_
-- Looking for sgemm_ - not found
CMake Error at
/software/tools/cmake/2.8.7/share/cmake-2.8/Modules/FindBLAS.cmake:612
(message):
   A required library with BLAS API not found.  Please specify library
   location.
Call Stack (most recent call first):
   CMakeLists.txt:24 (FIND_PACKAGE)


-- Configuring incomplete, errors occurred!
[mboisson at colosse1 squack-code]$


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