Re: [CMake] testing for MPI_IN_PLACE

Fri, 07 Jan 2011 06:27:16 -0800 

On 7/01/2011 11:17 PM, Michael Wild wrote:

On 01/07/2011 11:36 AM, Mark Abraham wrote:

Hi,

When using MPI, our project needs to be able to test for the validity of
MPI_IN_PLACE (http://redmine.gromacs.org/issues/594). Ideally we could
use try_compile to compile a simple test program, however we need to be
able to direct the use of the compiler information CMake found using the
FindMPI module. I don't think this is possible at the moment.

Is there a recommended procedure? Should I open a try_compile feature
request in the issue tracker?

Regards,

Mark


Try this:

find_package(MPI REQUIRED)

include(CheckCSourceCompiles)
set(CMAKE_REQUIRED_DEFINITIONS ${MPI_COMPILE_FLAGS})
set(CMAKE_REQUIRED_INCLUDES ${MPI_INCLUDE_PATH})
set(CMAKE_REQUIRED_LIBRARIES ${MPI_LIBRARIES})
check_c_source_compiles(
"#include<mpi.h>
int main() {
   void* buf;
   MPI_Allreduce(MPI_IN_PLACE, buf, 10, MPI_FLOAT, MPI_SUM, MPI_COMM_WORLD);
}" MPI_IN_PLACE_COMPILE_OK)


Works for me, on Ubuntu 10.10 with openmpi. Internally, the
CheckCSourceCompiles.cmake module also uses try_compile, but wraps it
nicely and makes sure the test is only run once, and then the result is
cached.


Hi,
Thanks for your suggestion. I tried it using gmxTestMPI_IN_PLACE.cmake containing 

find_package(MPI REQUIRED)

MACRO(GMX_TEST_MPI_IN_PLACE VARIABLE)
MESSAGE(STATUS "Checking for MPI_IN_PLACE with '${MPI_COMPILE_FLAGS}', '${MPI_INCLUDE_PATH}', '${MPI_LIBRARIES}'") 

    include(CheckCSourceCompiles)
    set(CMAKE_REQUIRED_DEFINITIONS ${MPI_COMPILE_FLAGS})
    set(CMAKE_REQUIRED_INCLUDES ${MPI_INCLUDE_PATH})
    set(CMAKE_REQUIRED_LIBRARIES ${MPI_LIBRARIES})
    check_c_source_compiles(
      "#include <mpi.h>
int main() {
  void* buf;
  MPI_Allreduce(MPI_IN_PLACE, buf, 10, MPI_FLOAT, MPI_SUM, MPI_COMM_WORLD);
}" MPI_IN_PLACE_COMPILE_OK)

    if(MPI_IN_PLACE_COMPILE_OK)
        MESSAGE(STATUS "Checking for MPI_IN_PLACE - yes")
            set(${VARIABLE} ${MPI_IN_PLACE_COMPILE_OK}
                "Result of test for MPI_IN_PLACE")
    else(MPI_IN_PLACE_COMPILE_OK)
        MESSAGE(STATUS "Checking for MPI_IN_PLACE - no")
    endif(MPI_IN_PLACE_COMPILE_OK)
ENDMACRO(GMX_TEST_MPI_IN_PLACE VARIABLE)

and received as (abbreviated) output from "cmake .. --trace":

...<snip>...
/home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(8): find_package(MPI REQUIRED ) /home/mxa224/builds/gromacs/cmake/FindMPI.cmake(75): TRY_COMPILE(MPI_FOUND ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/cmake/TestMPI.c COMPILE_DEFINITIONS ) 
...<snip>...
/home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(10): MACRO(GMX_TEST_MPI_IN_PLACE VARIABLE ) 
/home/mxa224/builds/gromacs/CMakeLists.txt(193):  if(GMX_MPI_IN_PLACE )
/home/mxa224/builds/gromacs/CMakeLists.txt(194): gmx_test_mpi_in_place(MPI_IN_PLACE_EXISTS ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(11): MESSAGE(STATUS Checking for MPI_IN_PLACE with '${MPI_COMPILE_FLAGS}', '${MPI_INCLUDE_PATH}', '${MPI_LIBRARIES}' ) -- Checking for MPI_IN_PLACE with '', '/apps/openmpi/1.4.3/include', '/apps/openmpi/1.4.3/lib/libmpi_cxx.so;/apps/openmpi/1.4.3/lib/libmpi.so;/apps/openmpi/1.4.3/lib/libopen-rte.so;/apps/openmpi/1.4.3/lib/libopen-pal.so;/usr/lib64/libdl.so;/usr/lib64/libnsl.so;/usr/lib64/libutil.so;/usr/lib64/libm.so;/usr/lib64/libdl.so' /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(13): include(CheckCSourceCompiles ) /apps/CMake/2.8.2/share/cmake-2.8/Modules/CheckCSourceCompiles.cmake(27): MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(14): set(CMAKE_REQUIRED_DEFINITIONS ${MPI_COMPILE_FLAGS} ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(15): set(CMAKE_REQUIRED_INCLUDES ${MPI_INCLUDE_PATH} ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(16): set(CMAKE_REQUIRED_LIBRARIES ${MPI_LIBRARIES} ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(17): check_c_source_compiles(#include <mpi.h> 
int main() {
  void* buf;
  MPI_Allreduce(MPI_IN_PLACE, buf, 10, MPI_FLOAT, MPI_SUM, MPI_COMM_WORLD);
} MPI_IN_PLACE_COMPILE_OK )
/apps/CMake/2.8.2/share/cmake-2.8/Modules/CheckCSourceCompiles.cmake(28): IF(MPI_IN_PLACE_COMPILE_OK MATCHES ^MPI_IN_PLACE_COMPILE_OK$ ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(24): if(MPI_IN_PLACE_COMPILE_OK ) /home/mxa224/builds/gromacs/cmake/gmxTestMPI_IN_PLACE.cmake(29): MESSAGE(STATUS Checking for MPI_IN_PLACE - no ) 
-- Checking for MPI_IN_PLACE - no
...<snip>...
It appears that FindMPI.cmake works fine, but then the CMake macro CHECK_C_SOURCE_COMPILES seems to fail its "check variable name for sanity" test. I can conceive of no reason for this happening. What have I done wrong, please? 

Regards,

Mark
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