Adds a find module for PT-Scotch.

This is e.g. needed for dune-alugrid and might be a first step for
getting rid off the ParMETIS dependency.

cmake/modules/AddPTScotchFlags.cmake

+# Module providing convenience functions for using PT-Scotch
+#
+# Provides the following functions:
+#
+# add_dune_parmetis_flags(target1 target2 ...)
+#
+# Adds the necessary flags to compile and link the targets with PT-Scotch support.
+#
+function(add_dune_ptscotch_flags _targets)
+  if(PTSCOTCH_FOUND)
+    foreach(_target ${_targets})
+      message("pt-scotch target_link_libraries(${_target} ${PTSCOTCH_LIBRARY} ${PTSCOTCHERR_LIBRARY}")
+      target_link_libraries(${_target} ${PTSCOTCH_LIBRARY} ${PTSCOTCHERR_LIBRARY})
+      GET_TARGET_PROPERTY(_props ${_target} INCLUDE_DIRECTORIES)
+      string(REPLACE "_props-NOTFOUND" "" _props "${_props}")
+      SET_TARGET_PROPERTIES(${_target} PROPERTIES INCLUDE_DIRECTORIES
+        "${_props};${PTSCOTCH_INCLUDE_DIRS}")
+      GET_TARGET_PROPERTY(_props ${_target} COMPILE_DEFINITIONS)
+      string(REPLACE "_props-NOTFOUND" "" _props "${_props}")
+      SET_TARGET_PROPERTIES(${_target} PROPERTIES COMPILE_DEFINITIONS
+        "${_props};")
+    endforeach(_target ${_targets})
+    add_dune_mpi_flags(${_targets})
+  endif(PTSCOTCH_FOUND)
+endfunction(add_dune_ptscotch_flags)

cmake/modules/CMakeLists.txt

@@ -2,6 +2,7 @@ set(modules
   AddGMPFlags.cmake
   AddMETISFlags.cmake
   AddParMETISFlags.cmake
+  AddPTScotchFlags.cmake
   AddUMFPackFlags.cmake
   CheckCXX11Features.cmake
   DuneBoost.cmake
@@ -22,6 +23,7 @@ set(modules
   FindMETIS.cmake
   FindMProtect.cmake
   FindParMETIS.cmake
+  FindPTScotch.cmake
   FindUMFPack.cmake
   Headercheck.cmake
   LanguageSupport.cmake

cmake/modules/FindPTScotch.cmake

+# Module that checks whether PT-Scotch is available.
+#
+# Accepts the following variables:
+#
+# PTSCOTCH_ROOT:   Prefix where PT-Scotch is installed.
+# PTSCOTCH_SUFFIX: Scotch might be compiled using different
+#                  integer sizes (int32, int32, long). When
+#                  this is is set the headers and libaries
+#                  are search under the suffix
+#                  include/scotch-${PTSCOTCH_SUFFIX, and
+#                  lib/scotch-${PTSCOTCH_SUFFIX}, respectively.
+# Sets the following variables:
+# PTSCOTCH_INCLUDE_DIRS: All include directories needed to compile PT-Scotch programs.
+# PTSCOTCH_LIBRARIES:    Alle libraries needed to link PT-Scotch programs.
+# PTSCOTCH_FOUND:        True if PT-Scotch was found.
+#
+# Provides the following macros:
+#
+# find_package(PTScotch)
+
+include(DuneMPI)
+macro(_search_pt_lib libvar libname doc)
+  find_library(${libvar} ${libname}
+    PATHS${PTSCOTCH_ROOT} PATH_SUFFIXES ${PATH_SUFFIXES}
+    NO_DEFAULT_PATH
+    DOC "${doc}")
+  find_library(${libvar} ${libname})
+endmacro(_search_pt_lib)
+
+if(PTSCOTCH_SUFFIX)
+  set(PATH_SUFFIXES "scotch-${PTSCOTCH_SUFFIX}")
+else(PTSCOTCH_SUFFIX)
+  set(PATH_SUFFIXES "scotch")
+endif(PTSCOTCH_SUFFIX)
+
+include(CMakePushCheckState)
+cmake_push_check_state() # Save variables
+set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${MPI_DUNE_INCLUDE_PATH})
+set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${MPI_DUNE_COMPILE_FLAGS}")
+
+find_path(PTSCOTCH_INCLUDE_DIR ptscotch.h
+  PATHS ${PTSCOTCH_ROOT}
+  PATH_SUFFIXES ${PATH_SUFFIXES}
+  NO_DEFAULT_PATH
+  DOC "Include directory of PT-Scotch")
+find_path(PTSCOTCH_INCLUDE_DIR ptscotch.h
+  PATH_SUFFIXES ${PATH_SUFFIXES})
+
+_search_pt_lib(PTSCOTCH_LIBRARY ptscotch "The main PT-Scotch library.")
+_search_pt_lib(PTSCOTCHERR_LIBRARY ptscotcherr "The PT-Scotch error library.")
+
+# behave like a CMake module is supposed to behave
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(
+  "PTScotch"
+  DEFAULT_MSG
+  PTSCOTCH_INCLUDE_DIR
+  PTSCOTCH_LIBRARY
+  PTSCOTCHERR_LIBRARY
+)
+#restore old values
+cmake_pop_check_state()
+
+if(PTSCOTCH_FOUND)
+  set(PTSCOTCH_INCLUDE_DIRS ${PTSCOTCH_INCLUDE_DIR})
+  set(PTSCOTCH_LIBRARIES ${PTSCOTCH_LIBRARY} ${PTSCOTCHERR_LIBRARY} ${MPI_DUNE_LIBRARIES}
+    CACHE FILEPATH "All libraries needed to link programs using PT-Scotch")
+  set(PTSCOCH_LINK_FLAGS "${DUNE_MPI_LINK_FLAGS}"
+    CACHE STRING "PT-Scotch link flags")
+  set(HAVE_PTSCOTCH 1)
+  # log result
+  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+    "Determing location of PT-Scotch succeded:\n"
+    "Include directory: ${PTSCOTCH_INCLUDE_DIRS}\n"
+    "Library directory: ${PTSCOTCH_LIBRARIES}\n\n")
+
+  foreach(dir ${PTSCOCTH_INCLUDE_DIRS})
+    set_property(GLOBAL APPEND PROPERTY ALL_PKG_FLAGS "-I${dir}")
+  endforeach()
+  set_property(GLOBAL APPEND PROPERTY ALL_PKG_LIBS "${PTSCOTCH_LIBRARIES}")
+endif(PTSCOTCH_FOUND)
+
+mark_as_advanced(PTSCOTCH_INCLUDE_DIR PTSCOTCH_LIBRARIES HAVE_PTSCOTCH)

cmake/modules/Makefile.am

@@ -2,6 +2,7 @@ MODULES = \
   AddGMPFlags.cmake        \
   AddMETISFlags.cmake      \
   AddParMETISFlags.cmake   \
+  AddPTScotchFlags.cmake   \
   AddUMFPackFlags.cmake    \
   CheckCXX11Features.cmake \
   DuneBoost.cmake \
@@ -22,6 +23,7 @@ MODULES = \
   FindMETIS.cmake         \
   FindMProtect.cmake      \
   FindParMETIS.cmake      \
+  FindPTScotch.cmake      \
   FindUMFPack.cmake       \
   Headercheck.cmake       \
   LanguageSupport.cmake   \

config.h.cmake

@@ -124,6 +124,9 @@
    by configure _and_ if the application uses the PARMETIS_CPPFLAGS */
 #cmakedefine HAVE_PARMETIS ENABLE_PARMETIS
 
+/* Define to 1 if PT-Scotch is available */
+#cmakedefine HAVE_PTSCOTCH 1
+
 /* Include always useful headers */
 #include "FC.h"
 #define FC_FUNC FC_GLOBAL_