made libmesh paths configurable in cmake

libmesh/CMakeLists.txt

@@ -5,12 +5,9 @@ find_package(MPI)      # Built-in in CMake
 
 include(${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/common.cmake)
 
-#TODO: this is ugly, use cached variables
-set(LIBMESH_INCLUDE_PATH $ENV{HOME}/libmesh/libmesh_install/include)
-set(LIBMESH_LIBRARY_PATH $ENV{HOME}/libmesh/libmesh_install/lib)
-set(LOCAL_INCLUDE_PATH /usr/local/include)
-set(LOCAL_LIBRARY_PATH /usr/local/lib)
-set(LIBMESH_LIBRARIES mesh_opt)
+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" )
 
 # ==================================================================================================
 
@@ -33,7 +30,7 @@ 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_LIBRARIES} ${MPI_LIBRARIES})
+    target_link_libraries(${NAME} ${LIBMESH_LIBRARY} ${MPI_LIBRARIES})
     install(TARGETS ${NAME} DESTINATION bin)
     message("** Enabling '${NAME}': with MPI")
 else()

libmesh/main.cpp

@@ -9,7 +9,7 @@ int main(int argc, char* argv[]) {
 	libMesh::LibMeshInit init(argc, argv);
 
 	if (argc < 2) {
-		libmesh_error_msg("Usage: " << argv[0] << "in.mesh [-o out.mesh]");
+		libmesh_error_msg("Usage: " << argv[0] << " in.mesh [-o out.mesh]");
 	}
 	const auto& input_mesh = std::string { argv[1] };