[cmake] Introduce targets for Find SuperLU

cmake/modules/AddSuperLUFlags.cmake

@@ -13,26 +13,20 @@
 # set HAVE_SUPERLU for config.h
 set(HAVE_SUPERLU ${SUPERLU_FOUND})
 
-# register all superlu related flags
+# register all SuperLU related flags
 if(SUPERLU_FOUND)
-  dune_register_package_flags(COMPILE_DEFINITIONS "ENABLE_SUPERLU=1"
-                              LIBRARIES "${SUPERLU_DUNE_LIBRARIES}"
-                              INCLUDE_DIRS "${SUPERLU_INCLUDE_DIRS}")
+  dune_register_package_flags(
+    COMPILE_DEFINITIONS "ENABLE_SUPERLU=1"
+    LIBRARIES SuperLU::SuperLU)
 endif()
 
 # Provide function to set target properties for linking to SuperLU
-function(add_dune_superlu_flags)
+function(add_dune_superlu_flags _targets)
   if(SUPERLU_FOUND)
-    cmake_parse_arguments(_add_superlu "OBJECT" "" "" ${ARGN})
-    foreach(_target ${_add_superlu_UNPARSED_ARGUMENTS})
-      if(NOT _add_superlu_OBJECT)
-        target_link_libraries(${_target} ${SUPERLU_DUNE_LIBRARIES})
-      endif()
-      get_target_property(_props ${_target} COMPILE_FLAGS)
-      string(REPLACE "_props-NOTFOUND" "" _props "${_props}")
-      set_target_properties(${_target} PROPERTIES COMPILE_FLAGS
-        "${_props} ${SUPERLU_DUNE_COMPILE_FLAGS} -DENABLE_SUPERLU=1")
+    foreach(_target ${_targets})
+      target_link_libraries(${_target} SuperLU::SuperLU)
+      target_compile_definitions(${_target} PUBLIC ENABLE_SUPERLU=1)
     endforeach()
-  endif(SUPERLU_FOUND)
+  endif()
 endfunction(add_dune_superlu_flags)
 

cmake/modules/FindSuperLU.cmake

@@ -13,9 +13,19 @@
 #
 #    :code:`SUPERLU_INCLUDE_DIRS`
 #       Path to the SuperLU include dirs.
+#       .. deprecated:: 2.8
+#          Use target SuperLU::SuperLU instead.
 #
 #    :code:`SUPERLU_LIBRARIES`
 #       Name to the SuperLU library.
+#       .. deprecated:: 2.8
+#          Use target SuperLU::SuperLU instead.
+#
+#
+#    This module provides the following imported targets, if found:
+#
+#    :code:`SuperLU:SuperLU`
+#      Library and include directories for the found SuperLU.
 #
 #
 #    This module provides the following imported targets, if found:
@@ -99,8 +109,24 @@ find_package_handle_standard_args(
 
 mark_as_advanced(SUPERLU_INCLUDE_DIR SUPERLU_LIBRARY SUPERLU_MIN_VERSION_5)
 
+
 # if both headers and library are found, store results
 if(SUPERLU_FOUND)
+  if(NOT TARGET SuperLU::SuperLU)
+    add_library(SuperLU::SuperLU UNKNOWN IMPORTED)
+    set_target_properties(SuperLU::SuperLU
+      PROPERTIES
+      IMPORTED_LOCATION ${SUPERLU_LIBRARY}
+      INTERFACE_INCLUDE_DIRECTORIES "${SUPERLU_INCLUDE_DIR}")
+    # Link BLAS library
+    if(TARGET BLAS::BLAS)
+      target_link_libraries(SuperLU::SuperLU
+        INTERFACE BLAS::BLAS)
+    else()
+      target_link_libraries(SuperLU::SuperLU
+        INTERFACE ${BLAS_LINKER_FLAGS} ${BLAS_LIBRARIES})
+    endif()
+  endif()
   set(SUPERLU_INCLUDE_DIRS ${SUPERLU_INCLUDE_DIR})
   set(SUPERLU_LIBRARIES    ${SUPERLU_LIBRARY})
   # log result
@@ -112,7 +138,7 @@ if(SUPERLU_FOUND)
     CACHE STRING "Compile flags used by DUNE when compiling SuperLU programs")
   set(SUPERLU_DUNE_LIBRARIES ${SUPERLU_LIBRARIES} ${BLAS_LIBRARIES}
     CACHE STRING "Libraries used by DUNE when linking SuperLU programs")
-else(SUPERLU_FOUND)
+else()
   # log errornous result
   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
     "Determining location of SuperLU failed:\n"