[cmake] Remove deprecated CMake variables for SuperLU

CHANGELOG.md

@@ -6,6 +6,13 @@ SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
 # Master (will become release 2.10)
 
 
+## Deprecations and removals
+
+- The deprecated CMake variables `SUPERLU_INCLUDE_DIRS`, `SUPERLU_LIBRARIES`,
+  `SUPERLU_DUNE_COMPILE_FLAGS`, and `SUPERLU_DUNE_LIBRARIES` are removed, they are
+  replaced by the target `SuperLU::SuperLU`.
+
+
 # Release 2.9
 
 - Add `const` qualifier to `LinearOperator` and `ScalarProduct` in

cmake/modules/AddSuperLUFlags.cmake

@@ -21,15 +21,6 @@ if(SuperLU_FOUND)
   dune_register_package_flags(
     COMPILE_DEFINITIONS "ENABLE_SUPERLU=1"
     LIBRARIES SuperLU::SuperLU)
-  # for backwards compatibility only,
-  # they are deprecated and will be removed after Dune 2.8
-  set(SUPERLU_INCLUDE_DIRS ${SUPERLU_INCLUDE_DIR})
-  set(SUPERLU_LIBRARIES    ${SUPERLU_LIBRARY})
-  set(SUPERLU_FOUND ${SuperLU_FOUND})
-  set(SUPERLU_DUNE_COMPILE_FLAGS "-I${SUPERLU_INCLUDE_DIRS}"
-    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")
 endif()
 
 # Provide function to set target properties for linking to SuperLU

cmake/modules/FindSuperLU.cmake

@@ -10,17 +10,6 @@
 #    :code:`SuperLU_FOUND`
 #       True if SuperLU available and usable.
 #
-#    :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`