[CMake] how to use the FindMPI module correctly?

[Alexander Droste]

Hello everyone,

based on the documentation here:
http://www.cmake.org/cmake/help/v3.0/module/FindMPI.html

and posts on SO:
http://stackoverflow.com/questions/23163075/how-to-compile-an-mpi-included-c-program-using-cmake

I'm still not a 100% sure if I set up my CMake project correctly.
This is what I do:

#------------------------
#...
find_package(MPI REQUIRED)
add_executable(core.x main.c)

include_directories(SYSTEM ${MPI_C_INCLUDE_PATH})
link_directories(${MPI_C_LINK_FLAGS})
set(CMAKE_COMPILE_FLAGS ${CMAKE_COMPILE_FLAGS} ${MPI_C_COMPILE_FLAGS})
target_link_libraries(core.x ${MPI_C_LIBRARIES})
#-------------------------

Is this the correct way? Am I missing s.th.? I am especially unsure 
about the compile flags variable.

At "Usage" (CMake documentation) it said that "To use this module, 
simply call FindMPI from a CMakeLists.txt file". So can I break down the 
MPI setup to a single command. How do I call FindMPI? Or is it done by 
calling find_package like I did?

The program build runs fine but I would like to ensure
that the cmake project is set up as correct and generic as possible.

Greetings,
Alex