Cannot build with OpenBLAS due to missing -lpthread

[reference-scalapack]

Cannot build with OpenBLAS due to missing -lpthread

[weslleyspereira]

Thanks for the attempts. I've come up with a simple solution:

cmake -D USE_OPTIMIZED_LAPACK_BLAS=ON -D BLA_VENDOR=OpenBLAS .. # configure step
cmake --build build # build step

[weslleyspereira]

Hi. What is the content of OPENBLAS_LIB ? Could you please try the following:

$ export BLAS_LIB="$OPENBLAS_LIB -lpthread"
$ export LAPACK_LIB="$OPENBLAS_LIB -lpthread"
$ cmake . -D LAPACK_LIBRARIES=$LAPACK_LIB -D BLAS_LIBRARIES=$BLAS_LIB

As far as I understand, BLAS_LIBRARIES and LAPACK_LIBRARIES should contain all libraries needed for the optimized BLAS and LAPACK libraries to work.

[TiborGY]

Hi. What is the content of OPENBLAS_LIB ?

~/nfs_zpool/scalapack$ echo $OPENBLAS_LIB
/mnt/nfsroot/libs/OpenBLAS_latest_zen/lib/libopenblas.a

Could you please try the following:

$ export BLAS_LIB="$OPENBLAS_LIB -lpthread"
$ export LAPACK_LIB="$OPENBLAS_LIB -lpthread"
$ cmake . -D LAPACK_LIBRARIES=$LAPACK_LIB -D BLAS_LIBRARIES=$BLAS_LIB

Does not work, cmake tries to interpret it instead of treating it as a string:

~/nfs_zpool/scalapack$ cmake . -D LAPACK_LIBRARIES=$LAPACK_LIB -D BLAS_LIBRARIES=$BLAS_LIB
CMake Error: Unknown argument -lpthread
CMake Error: Run 'cmake --help' for all supported options.

[weslleyspereira]

I'm sorry. We're missing the double quotes. So:

$ cmake . -D LAPACK_LIBRARIES="$LAPACK_LIB" -D BLAS_LIBRARIES="$BLAS_LIB"

If it still does not work, I would replace -lpthread by the complete path for the pthread library.

This is what I would do. If it does not work, I can install OpenBLAS to try to help you.

[TiborGY]

Defining the variables like this leads to other issues, CMake generates an invalid Makefile, where the name of the target includes the path to the BLAS lib.

[ 68%] Built target scalapack
Scanning dependencies of target xslu
[ 68%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/psludriver.f.o
[ 68%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/psluinfo.f.o
[ 69%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/psgetrrv.f.o
[ 69%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/psmatgen.f.o
[ 69%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/pmatgeninc.f.o
[ 69%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/pslaschk.f.o
[ 69%] Building Fortran object TESTING/LIN/CMakeFiles/xslu.dir/pslafchk.f.o
make[2]: *** No rule to make target '/mnt/nfsroot/libs/OpenBLAS_latest_zen/lib/libopenblas.a -lpthread', needed by 'TESTING/xslu'.  Stop.
make[1]: *** [CMakeFiles/Makefile2:1260: TESTING/LIN/CMakeFiles/xslu.dir/all] Error 2
make: *** [Makefile:166: all] Error 2