[!657] Deprecate old versions of METIS and ParMETIS

Merge branch 'feature/deprecate-old-metis-parmetis' into 'master'

See merge request [!657]

  [!657]: Nonecore/dune-common/merge_requests/657

CHANGELOG.md

@@ -41,6 +41,9 @@
 
 -   The `dune_symlink_to_sources_files` cmake function now has a `DESTINATION` argument.
 
+- Support for older version than METIS 5.x and ParMETIS 4.x is deprecated and will be
+  removed after Dune 2.7.
+
 - The `inkscape_generate_png_from_svg` CMake function is deprecated and will be removed
   after 2.7.
 

cmake/modules/FindMETIS.cmake

@@ -134,6 +134,13 @@ if(METIS_FOUND)
     "Determing location of METIS succeeded:\n"
     "Include directory: ${METIS_INCLUDE_DIRS}\n"
     "Library directory: ${METIS_LIBRARIES}\n\n")
+  # deprecate versions < 5
+  file(READ "${METIS_INCLUDE_DIR}/metis.h" metisheader)
+  string(REGEX MATCH "#define METIS_VER_MAJOR[ ]+[0-9]+" versionMacroDef "${metisheader}")
+  string(REGEX MATCH "[0-9]+" MetisMajorVersion "${versionMacroDef}")
+  if("${versionMacroDef}" STREQUAL "" OR "${MetisMajorVersion}" LESS 5)
+    message(AUTHOR_WARNING "Support for METIS older than version 5.x is deprecated in Dune 2.7")
+  endif()
 else(METIS_FOUND)
   # log errornous result
   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log

cmake/modules/FindParMETIS.cmake

@@ -157,6 +157,13 @@ if(PARMETIS_FOUND)
     "Determing location of ParMETIS succeeded:\n"
     "Include directory: ${PARMETIS_INCLUDE_DIRS}\n"
     "Library directory: ${PARMETIS_LIBRARIES}\n\n")
+  # deprecate versions < 4
+  file(READ "${PARMETIS_INCLUDE_DIR}/parmetis.h" parmetisheader)
+  string(REGEX MATCH "#define PARMETIS_MAJOR_VERSION[ ]+[0-9]+" versionMacroDef "${parmetisheader}")
+  string(REGEX MATCH "[0-9]+" ParMetisMajorVersion "${versionMacroDef}")
+  if("${versionMacroDef}" STREQUAL "" OR "${ParMetisMajorVersion}" LESS 4)
+    message(AUTHOR_WARNING "Support for METIS older than version 4.x is deprecated in Dune 2.7")
+  endif()
 else()
   # log errornous result
   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log