added FindLibMesh.cmake find module

libmesh/CMakeLists.txt

 # Packages are optional: if they are not present, certain code samples are not compiled
 cmake_minimum_required(VERSION 2.8.10 FATAL_ERROR)
 
-find_package(MPI)      # Built-in in CMake
-find_package(Threads)
+find_package(MPI REQUIRED)      # Built-in in CMake
+find_package(Threads REQUIRED)
 
 include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/common.cmake)
 
-set(LIBMESH_INCLUDE_PATH /usr/local/include CACHE PATH "path to libMesh include directory")
-set(LIBMESH_LIBRARY_PATH /usr/local/lib CACHE PATH "path to libMesh library directory")
-set(LIBMESH_LIBRARY mesh_opt CACHE FILEPATH "name of libmesh library" )
+find_package(LibMesh REQUIRED)
 
 # ==================================================================================================
 
@@ -18,11 +16,9 @@ endif()
 
 set(NAME ${DWARF_PREFIX}_libmesh)
 
-#TODO: check for libmesh too
-if (MPI_FOUND)
+if (MPI_FOUND AND LIBMESH_FOUND)
 	enable_language(CXX)
-    include_directories(${MPI_INCLUDE_PATH} ${LIBMESH_INCLUDE_PATH})
-    link_directories(${LIBMESH_LIBRARY_PATH}) 
+    include_directories(${LIBMESH_INCLUDE_DIRS} ${MPI_INCLUDE_PATH})
     add_executable(${NAME} fem_system_ex4.cpp heatsystem.cpp)
     set(CMAKE_BUILD_TYPE RelWithDebInfo)
     if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
@@ -31,12 +27,11 @@ if (MPI_FOUND)
     	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -xHost -std=c++14")
     endif()
     set_target_properties(${NAME} PROPERTIES CXX_STANDARD 14 CXX_STANDARD_REQUIRED YES)
-    target_link_libraries(${NAME} ${LIBMESH_LIBRARY} ${MPI_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+    target_link_libraries(${NAME} ${LIBMESH_LIBRARIES} ${MPI_CXX_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
     install(TARGETS ${NAME} DESTINATION bin)
-    message("** Enabling '${NAME}': with MPI")
+    message("** Enabling '${NAME}': with LibMesh and MPI")
 else()
-    message("## Skipping '${NAME}': MPI support missing")
-#    dummy_install(${NAME} "MPI")
+    message("## Skipping '${NAME}': LibMesh or MPI support missing")
 endif()
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${C_FLAGS}")