Intel oneAPI 2025.2 new options for MKLconfig.cmake

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Intel oneAPI 2025.2 CMake MKLconfig.cmake new options

Intel oneAPI 2025.2 introduces functionality and some new flags and settings that broke projects using MKL Scalapack. If using CMake with MKLconfig.cmake from Intel oneAPI, here is how to keep working with oneMKL including 2025.2.

In the CMakeLists.txt or other CMake script using find_package(MKL CONFIG REQUIRED) do like the following example that uses MKL ScaLAPACK:

set(ENABLE_SCALAPACK true)
set(ENABLE_BLAS true)

set(MKL_INTERFACE "lp64")
# "lp64" is the 32-bit interface, "ilp64" is the 64-bit interface

set(MKL_SYCL_MPI false)
set(MKL_SYCL_LINK false)
# for Intel oneAPI 2025.2, we don't need SYCL

find_package(MKL CONFIG REQUIRED)

Test this out with Intel MKL Scalapack examples

bad_config.log

-- MKL_VERSION: 2025.2.0
-- MKL_ROOT: /opt/intel/oneapi/mkl/2025.2
-- MKL_ARCH: intel64
-- MKL_SYCL_LINK: None, set to ` dynamic` by default
-- MKL_LINK: None, set to ` dynamic` by default
-- MKL_SYCL_INTERFACE_FULL: intel_lp64
-- MKL_INTERFACE_FULL: intel_lp64
-- MKL_SYCL_THREADING: sequential
-- MKL_THREADING: sequential
-- MKL_SYCL_MPI: None, set to ` intelmpi` by default
-- MKL_MPI: None, set to ` intelmpi` by default
-- Experimental oneMKL Data Fitting SYCL API does not support LP64 on CPU
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_scalapack_lp64.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_cdft_core.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_intel_lp64.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_sequential.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_core.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_blacs_intelmpi_lp64.so
CMake Warning at cmake/FindSCALAPACK.cmake:150 (find_package):
  Found package configuration file:

    /opt/intel/oneapi/mkl/2025.2/lib/cmake/mkl/MKLConfig.cmake

  but it set MKL_FOUND to FALSE so package "MKL" is considered to be NOT
  FOUND.  Reason given by package:

  The required variable mkl_sycl_distributed_dft_file has an invalid value
  "mkl_sycl_distributed_dft_file-NOTFOUND".

good_config.log

-- MKL_VERSION: 2025.2.0
-- MKL_ROOT: /opt/intel/oneapi/mkl/2025.2
-- MKL_ARCH: intel64
-- MKL_LINK: None, set to ` dynamic` by default
-- MKL_INTERFACE_FULL: intel_lp64
-- MKL_THREADING: sequential
-- MKL_MPI: None, set to ` intelmpi` by default
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_scalapack_lp64.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_cdft_core.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_intel_lp64.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_sequential.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_core.so
-- Found /opt/intel/oneapi/mkl/2025.2/lib/libmkl_blacs_intelmpi_lp64.so