[FindMETIS.cmake]

Improve METIS test, tested with versions 4.0.3 and 5.0.2.

[[Imported from SVN: r7035]]

cmake/modules/FindMETIS.cmake

@@ -21,45 +21,81 @@
 #
 # Adds the necessary flags to comile and link TARGETS with ParMETIS support.
 #
-find_path(METIS_INCLUDE_DIRS metis.h PATHS ${METIS_DIR}
-  PATH_SUFFIXES metis NO_DEFAULT_PATH
+
+# function to add the metis flags to a target
+function(add_dune_metis_flags _targets)
+  if(METIS_FOUND)
+    foreach(_target ${_targets})
+      target_link_libraries(${_target} ${METIS_LIBRARY})
+    endforeach(_target ${_targets})
+    set_property(TARGET ${_targets} APPEND PROPERTIES
+      COMPILE_DIRECTORIES ${METIS_INCLUDE_DIR})
+  endif(METIS_FOUND)
+endfunction(add_dune_metis_flags _targets)
+
+# search metis header
+find_path(METIS_INCLUDE_DIR metis.h
+  PATHS ${METIS_DIR}
+  PATH_SUFFIXES metis include Lib
+  NO_DEFAULT_PATH
   DOC "Include directory of metis")
-find_path(METIS_INCLUDE_DIRS metis.h PATH_SUFFIXES metis)
+find_path(METIS_INCLUDE_DIR metis.h
+  PATH_SUFFIXES metis inclue Lib)
+
 set(METIS_LIBRARY METIS_LIBRARY-NOTFOUND CACHE FILEPATH "Full path of the METIS library")
 
+# check metis header
 include(CMakePushCheckState)
-
 cmake_push_check_state() # Save variables
-set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${METIS_INCLUDE_DIRS})
+set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${METIS_INCLUDE_DIR})
 check_include_file(metis.h METIS_FOUND)
+
+# search metis library
 if(NOT METIS_LIB_NAME)
   set(METIS_LIB_NAME metis)
 endif(NOT METIS_LIB_NAME)
 
-find_library(METIS_LIBRARY ${METIS_LIB_NAME} PATHS ${ParMETIS_DIR}
-  PATH_SUFFIXES lib NO_DEFAULT_PATH)
-find_library(METIS_LIBRARY ${METIS_LIB_NAME})
+find_library(METIS_LIBRARY ${METIS_LIB_NAME}
+  PATHS ${METIS_DIR}
+  PATH_SUFFIXES lib
+  NO_DEFAULT_PATH)
+find_library(METIS_LIBRARY ${METIS_LIB_NAME}
+  PATH_SUFFIXES lib
+)
 
+# behave like a CMake module is supposed to behave
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  "METIS"
+  DEFAULT_MSG
+  METIS_INCLUDE_DIR
+  METIS_LIBRARY
+)
+
+# check metis library
 if(METIS_LIBRARY)
-  set(METIS_LIBRARIES ${METIS_LIBRARY})
-  list(APPEND CMAKE_REQUIRED_LIBRARIES ${METIS_LIBRARIES})
+  list(APPEND CMAKE_REQUIRED_LIBRARIES ${METIS_LIBRARIY})
+  set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${METIS_LIBRARY})
   include(CheckSymbolExists)
   check_symbol_exists(METIS_PartMeshDual metis.h METIS_FOUND)
 endif(METIS_LIBRARY)
 cmake_pop_check_state()
 
+mark_as_advanced(METIS_INCLUDE_DIR METIS_LIBRARIES METIS_LIB_NAME)
+
+# if both headers and library are found, store results
 if(METIS_FOUND)
-  message(STATUS "METIS found. Include directories are ${METIS_INCLUDE_DIRS} and libraries are ${METIS_LIBRARIES}")
+  set(METIS_INCLUDE_DIRS ${METIS_INCLUDE_DIR})
+  set(METIS_LIBRARIES ${METIS_LIBRARY})
+  # log result
+  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+    "Determing location of METIS succeded:\n"
+    "Include directory: ${METIS_INCLUDE_DIRS}\n"
+    "Library directory: ${METIS_LIBRARIES}\n\n")
 else(METIS_FOUND)
-  message(WARNING "No functional METIS found.")
+  # log errornous result
+  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+    "Determing location of METIS failed:\n"
+    "Include directory: ${METIS_INCLUDE_DIRS}\n"
+    "Library directory: ${METIS_LIBRARIES}\n\n")
 endif(METIS_FOUND)
-
-function(add_dune_metis_flags _targets)
-  if(METIS_FOUND)
-    foreach(_target ${_targets})
-      target_link_libraries(${_target} ${METIS_LIBRARY})
-    endforeach(_target ${_targets})
-    set_property(TARGET ${_targets} APPEND PROPERTIES
-      COMPILE_DIRECTORIES ${METIS_INCLUDE_DIRS})
-  endif(METIS_FOUND)
-endfunction(add_dune_metis_flags _targets)