[CMake] how to use the FindMPI module correctly?

[Daniel Schepler]

Would this work?

target_compile_options(core.x PUBLIC ${MPI_C_COMPILE_FLAGS})
-- 
Daniel
________________________________________
From: CMake [cmake-bounces at cmake.org] on behalf of Alexander Droste [alexander.ra.droste at googlemail.com]
Sent: Friday, April 03, 2015 2:54 PM
To: Thompson, KT
Cc: cmake at cmake.org
Subject: Re: [CMake] how to use the FindMPI module correctly?

Thanks for the validation.
But wouldn't the shorter version break in case MPI_C_COMPILE_FLAGS are
added in the future?


On 03.04.15 23:28, Thompson, KT wrote:
> Alex,
>
> Your setup looks fine.  However, depending on your environment, you may be able to use a simplified CMakeLists.txt.  This is what I use on Linux with g++ and OpenMPI.
>
> #--------------------
> cmake_minimum_required(VERSION 2.8)
> project(hw CXX)
> find_package( MPI )
> include_directories( ${MPI_CXX_INCLUDE_PATH} )
> add_executable( hw hw.cc )
> target_link_libraries( hw ${MPI_CXX_LIBRARIES} )
> #--------------------
>
> -kt
>
> -----Original Message-----
> From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Alexander Droste
> Sent: Friday, April 03, 2015 12:24 PM
> To: cmake at cmake.org
> Subject: [CMake] how to use the FindMPI module correctly?
>
> 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
>
--

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