Remove most special handling of MKL in CMake configuration

BUILD.md

@@ -95,7 +95,6 @@ CMake option | Values | Note
 `blaspp_DIR` | CMAKE:PATH | Location of the blaspp CMake-config file
 `lapackpp_DIR` | CMAKE:PATH | Location of the lapackpp CMake-config file
 `DLAF_WITH_MKL` | `{ON,OFF}` (default: `OFF`) | if blaspp/lapackpp is built with oneMKL
-`DLAF_WITH_LEGACY_MKL` | `{ON,OFF}` (default: `OFF`) | if blaspp/lapackpp is built with MKL (deprecated)
 `DLAF_WITH_SCALAPACK` | `{ON,OFF}` (default: `OFF`) | Enable ScaLAPACK-like API.
 `MKL_ROOT` | CMAKE:PATH | Location of the MKL library
 `DLAF_ASSERT_ENABLE` | `{ON,OFF}` (default: `ON`) | enable/disable cheap assertions

CMakeLists.txt

@@ -34,8 +34,6 @@ endif()
 
 option(BUILD_SHARED_LIBS "Build shared libraries." ON)
 option(DLAF_WITH_OPENMP "${DLAF_WITH_OPENMP_DESCRIPTION}" ${DLAF_WITH_OPENMP_DEFAULT})
-option(DLAF_WITH_MKL "Enable oneMKL as provider for BLAS and LAPACK" OFF)
-option(DLAF_WITH_MKL_LEGACY "Enable MKL as provider for BLAS and LAPACK" OFF)
 option(DLAF_WITH_CUDA "Enable CUDA support" OFF)
 option(DLAF_WITH_HIP "Enable HIP support" OFF)
 cmake_dependent_option(
@@ -55,11 +53,30 @@ option(DLAF_BUILD_DOC "Build documentation" OFF)
 option(DLAF_WITH_PRECOMPILED_HEADERS "Use precompiled headers." OFF)
 option(DLAF_WITH_SCALAPACK "Build ScaLAPACK-like C API (requires ScaLAPACK)" OFF)
 
-if(DLAF_WITH_MKL AND DLAF_WITH_MKL_LEGACY)
-  message(SEND_ERROR "DLAF_WITH_MKL and DLAF_WITH_MKL_LEGACY are mutually exclusive.")
+if(DEFINED CACHE{DLAF_WITH_MKL})
+  if(DLAF_WITH_MKL)
+    message(STATUS "Intel MKL support: Enabled by user")
+  else()
+    message(STATUS "Intel MKL support: Disabled by user")
+  endif()
+  set(DLAF_WITH_MKL_INTERNAL ${DLAF_WITH_MKL} CACHE BOOL "" FORCE)
+else()
+  unset(DLAF_WITH_MKL_TRY_COMPILE CACHE)
+  try_compile(
+    DLAF_WITH_MKL_TRY_COMPILE "${PROJECT_BINARY_DIR}/cmake/tests"
+    "${PROJECT_SOURCE_DIR}/cmake/tests/mkl_set_num_threads.cpp"
+    CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${LAPACK_INCLUDE_DIR}"
+    LINK_LIBRARIES ${LAPACK_LIBRARY}
+  )
+  if(DLAF_WITH_MKL_TRY_COMPILE)
+    message(STATUS "Intel MKL support: Found")
+  else()
+    message(STATUS "Intel MKL support: Not found")
+  endif()
+  set(DLAF_WITH_MKL_INTERNAL ${DLAF_WITH_MKL_TRY_COMPILE} CACHE BOOL "" FORCE)
 endif()
 
-if(DLAF_WITH_MKL OR DLAF_WITH_MKL_LEGACY)
+if(DLAF_WITH_MKL)
   # When using MKL there is no need to set the number of threads with
   # omp_set_num_threads; it's sufficient to use MKL's own mechanisms.
   set(DLAF_WITH_OPENMP OFF CACHE BOOL "${DLAF_WITH_OPENMP_DESCRIPTION}" FORCE)
@@ -140,58 +157,9 @@ if(DLAF_WITH_OPENMP)
   find_package(OpenMP REQUIRED)
 endif()
 
-# ----- LAPACK/SCALAPACK
-if(DLAF_WITH_MKL) # oneMKL
-  set(MKL_INTERFACE "lp64" CACHE STRING "")
-  set(MKL_THREADING "sequential" CACHE STRING "")
-  set(MKL_MPI "mpich" CACHE STRING "")
-
-  find_package(MKL CONFIG REQUIRED)
-
-  set(LAPACK_FOUND TRUE)
-  add_library(DLAF::LAPACK INTERFACE IMPORTED GLOBAL)
-  target_link_libraries(DLAF::LAPACK INTERFACE MKL::MKL)
-
-  if(DLAF_WITH_SCALAPACK)
-    set(SCALAPACK_FOUND TRUE)
-    add_library(DLAF::SCALAPACK INTERFACE IMPORTED GLOBAL)
-  endif()
-elseif(DLAF_WITH_MKL_LEGACY) # MKL (deprecated)
-  find_package(MKL MODULE REQUIRED)
-
-  set(MKL_LAPACK_TARGET "mkl::mkl_intel_32bit_seq_dyn"
-      CACHE STRING "MKL LAPACK target (see FindMKL for details)"
-  )
-
-  # Note:
-  # If specified targets are found, "standardize" them
-
-  if(TARGET ${MKL_LAPACK_TARGET})
-    set(LAPACK_FOUND TRUE)
-    add_library(DLAF::LAPACK INTERFACE IMPORTED GLOBAL)
-    target_link_libraries(DLAF::LAPACK INTERFACE ${MKL_LAPACK_TARGET})
-  else()
-    message(FATAL_ERROR "${MKL_LAPACK_TARGET} as LAPACK target has not been found")
-  endif()
-
-  if(DLAF_WITH_SCALAPACK)
-    set(MKL_SCALAPACK_TARGET "mkl::scalapack_intel_32bit_seq_dyn"
-        CACHE STRING "MKL ScaLAPACK target (see FindMKL for details)"
-    )
-
-    if(TARGET ${MKL_SCALAPACK_TARGET})
-      set(SCALAPACK_FOUND TRUE)
-      add_library(DLAF::SCALAPACK INTERFACE IMPORTED GLOBAL)
-      target_link_libraries(DLAF::SCALAPACK INTERFACE ${MKL_SCALAPACK_TARGET})
-    else()
-      message(FATAL_ERROR "${MKL_SCALAPACK_TARGET} as ScaLAPACK target has not been found")
-    endif()
-  endif()
-else()
-  find_package(LAPACK REQUIRED)
-  if(DLAF_WITH_SCALAPACK)
-    find_package(SCALAPACK REQUIRED)
-  endif()
+find_package(LAPACK REQUIRED)
+if(DLAF_WITH_SCALAPACK)
+  find_package(SCALAPACK REQUIRED)
 endif()
 
 # ----- pika

ci/common-ci.yml

@@ -34,7 +34,7 @@ stages:
     reports:
       dotenv: build.env
   variables:
-    SPACK_SHA: dcc4423a9d0219a26ceeb52e329ed956e41f4d2c
+    SPACK_SHA: 1184de8352281ce1b34a8f3f6b54d7fadc2b216a
     SPACK_DLAF_REPO: ./spack
     DOCKER_BUILD_ARGS: '[
         "BASE_IMAGE",

ci/docker/build.Dockerfile

@@ -15,7 +15,7 @@ RUN apt-get -yqq update && \
     apt-get -yqq install --no-install-recommends \
     software-properties-common \
     build-essential gfortran \
-    autoconf automake ninja-build pkg-config \
+    autoconf automake libssl-dev ninja-build pkg-config \
     ${EXTRA_APTGET} \
     gawk \
     python3 python3-distutils \

cmake/FindLAPACK.cmake

@@ -19,6 +19,9 @@
 #   LAPACK_LIBRARY
 #       ;-list of {lib name, lib filepath, -Llibrary_folder}
 #
+#   LAPACK_INCLUDE_DIR
+#       ;-list of include folders
+#
 # This module sets the following variables:
 #   LAPACK_FOUND - set to true if a library implementing the LAPACK interface is found
 #
@@ -54,27 +57,40 @@ endmacro()
 # Dependencies
 set(_DEPS "")
 
-if(LAPACK_LIBRARY STREQUAL "" OR NOT LAPACK_LIBRARY)
+if(NOT LAPACK_LIBRARY)
   set(LAPACK_LIBRARY "LAPACK_LIBRARIES-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
 endif()
 
 mark_as_advanced(LAPACK_LIBRARY)
 
 _lapack_check_is_working()
 
+if(NOT LAPACK_INCLUDE_DIR)
+  set(LAPACK_INCLUDE_DIR "LAPACK_INCLUDE_DIR-PLACEHOLDER-FOR-EMPTY-INCLUDE-DIR")
+endif()
+
+mark_as_advanced(LAPACK_INCLUDE_DIR)
+
 ### Package
 include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(LAPACK DEFAULT_MSG LAPACK_LIBRARY _LAPACK_CHECK _LAPACK_CHECK_BLAS)
+find_package_handle_standard_args(
+  LAPACK DEFAULT_MSG LAPACK_LIBRARY LAPACK_INCLUDE_DIR _LAPACK_CHECK _LAPACK_CHECK_BLAS
+)
 
-# Remove the placeholder
+# Remove the placeholders
 if(LAPACK_LIBRARY STREQUAL "LAPACK_LIBRARIES-PLACEHOLDER-FOR-EMPTY-LIBRARIES")
   set(LAPACK_LIBRARY "")
 endif()
 
+if(LAPACK_INCLUDE_DIR STREQUAL "LAPACK_INCLUDE_DIR-PLACEHOLDER-FOR-EMPTY-INCLUDE-DIR")
+  set(LAPACK_INCLUDE_DIR "")
+endif()
+
 if(LAPACK_FOUND)
   if(NOT TARGET DLAF::LAPACK)
     add_library(DLAF::LAPACK INTERFACE IMPORTED GLOBAL)
   endif()
 
   target_link_libraries(DLAF::LAPACK INTERFACE "${LAPACK_LIBRARY}" "${_DEPS}")
+  target_include_directories(DLAF::LAPACK INTERFACE "${LAPACK_INCLUDE_DIR}")
 endif()