Thanks, that really clears things up for me!
--Alex
On 04.04.15 14:39, Mark Abraham wrote:
On 03/04/2015 8:24 pm, "Alexander Droste" <
[email protected]> wrote:
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.
I think that most projects have no need of most of the functionality
provided by FindMPI. Instead, you can tell CMake in the first place that
the MPI wrapper compiler is your compiler, and leave the wrapper compiler
alone to do its job. Otherwise, you have to coordinate that FindMPI is
finding the wrapper compiler that you intend, and that it wraps the same
compiler CMake is using, so that the flags FindMPI gets from the wrapper
compiler can then work with CMake's compiler, because you can't change that
compiler once it is set.
The main exception would be a project where you want to build both MPI and
non-MPI binaries from the same configuration. But you can still achieve
this by using the wrapper compiler for everything... The non-MPI binary
just won't link things that aren't used.
Mark
Greetings,
Alex
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