Intel ifort compiler replaces -openmp with -qopenmp

[Yingxing Cheng]

Dear developers:

When I tried to compile DIRAC-18 using OpenMPI and Intel compiler with 64 integer , there is an error as follows:

ifort: command line error: option '-openmp' is not supported. Please use the replacement option '-qopenmp'

make[2]: *** [dirac.x] Error 1

make[1]: *** [CMakeFiles/dirac.x.dir/all] Error 2

make: *** [all] Error 2

It seems the version of Intel compiler is not compatible with DIRAC-18 and the Intel compiler version is 2019a as follows:

  1) cluster/phanpy                                       

  2) GCCcore/8.2.0

  3) binutils/2.31.1-GCCcore-8.2.0

  4) icc/2019.1.144-GCC-8.2.0-2.31.1

  5) ifort/2019.1.144-GCC-8.2.0-2.31.1

  6) iccifort/2019.1.144-GCC-8.2.0-2.31.1

  7) impi/2018.4.274-iccifort-2019.1.144-GCC-8.2.0-2.31.1

  8) iimpi/2019a

  9) imkl/2019.1.144-iimpi-2019a

 10) intel/2019a

How can I solve this problem, e.g. using older Intel compiler?

Best regards,

Yingxing Cheng

[Hans Jørgen Aagaard Jensen]

In the file cmake/downloaded/autocmake_omp.cmake you can find the lines:

        if(CMAKE_Fortran_COMPILER_ID MATCHES Intel)

            if(WIN32)

                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -Qopenmp")

            elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "Intel" AND

                   "${CMAKE_Fortran_COMPILER_VERSION}" VERSION_LESS "15.0.0.20140528")

                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -openmp")

            else()

                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qopenmp")

            endif()

        endif()

If you delete the lines marked with red it should work. It suppose that the cmake command VERSION_LESS does not work for the version string for intel compiler version 2019a.

-- Hans Jørgen.

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[Yingxing Cheng]

Thank you Hans! Actually, if I want to use Intel MKL I have to replace the line in the file ./downloaded/autocmake_math_libs.cmake:

368          # take care of omp flags

 369         set(_omp_flag)

 370         if(HAVE_MKL_BLAS OR HAVE_MKL_LAPACK)

 371             if(MKL_COMPILER_BINDINGS MATCHES Intel)

 372                 #set(_omp_flag -openmp)

 373                 set(_omp_flag -qopenmp)

 374             endif()

 375             if(MKL_COMPILER_BINDINGS MATCHES GNU)

 376                 set(_omp_flag -fopenmp)

 377             endif()

and then it works!

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[Hans Jørgen Aagaard Jensen]

Thank you, we had not spotted that one. We will fix that for the next patch release.

-- Hans Jørgen.

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