Cmake non funziona con openMP su Maverick

Question

Sto usando OpenMP per scrivere codice parallelo. Ecco una sezione delle CMakeLists utilizzate nel mio caso.

FIND_PACKAGE(OpenMP REQUIRED) 
    if(OPENMP_FOUND) 
    message("OPENMP FOUND") 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}") 
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}") 
    endif() 

Ma, quando iniziamo cmake .., Sembra che non DEOS trovare pacchetto OpenMP e ottengo questo errore

Try OpenMP C flag = [ ] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-fopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [/openmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-Qopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-openmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-xopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [+Oopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-qsmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP C flag = [-mp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [ ] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-fopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [/openmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-Qopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-openmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-xopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [+Oopenmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-qsmp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
-- Try OpenMP CXX flag = [-mp] 
-- Performing Test OpenMP_FLAG_DETECTED 
-- Performing Test OpenMP_FLAG_DETECTED - Failed 
CMake Error at /opt/local/share/cmake-3.3/Modules/FindPackageHandleStandardArgs.cmake:148 (message): 
    Could NOT find OpenMP (missing: OpenMP_C_FLAGS OpenMP_CXX_FLAGS) 

Ecco CMakeLists.txt

cmake_minimum_required(VERSION 2.6) 

#Declaration du projet 

project(MYfirstcamke) 

set(EXECUTABLE_OUTPUT_PATH bin/${CMAKE_BUILD_TYPE}) 

#Inclusion de opencv 

include_directories(/usr/local/include/) 

link_directories(/usr/local/lib) 

FIND_PACKAGE(OpenMP REQUIRED) 
if(OPENMP_FOUND) 
message("OPENMP FOUND") 
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}") 
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}") 
endif() 

find_package(PCL 1.2 REQUIRED) 
include_directories(${PCL_INCLUDE_DIRS}) 
link_directories(${PCL_LIBRARY_DIRS}) 
add_definitions(${PCL_DEFINITIONS}) 

file(

    GLOB_RECURSE 

    source_files 

    src/* 


) 
#declaration de l'executable 

add_executable(

my_executable 

${source_files} 

) 
#Configuration de l'edition de lien. 
target_link_libraries(

my_executable opencv_core opencv_imgproc opencv_video opencv_highgui ${PCL_LIBRARIES} 


) 

Come posso aggiustarlo? Sono sicuro che openMPi è installato e si trova su opt/local/include

Answer 1

OpenMP e MPI sono due cose completamente diverse.

OMP richiede il supporto del compilatore, che su OS X è necessario tramite Homebrew. (puoi anche installare MPI tramite Homebrew, che è bello).

brew install clang-omp 

Dopo aver installato clang-OMP, si può poi dire CMake di utilizzare tale compilatore invocando in questa maniera.

CC=clang-omp CXX=clang-omp++ cmake <insert your normal cmake parameters here> 

Answer 2

In aggiunta alla risposta di cui sopra, è anche possibile installare gcc-5/g ++ - 5 da homebrew. L'installazione plain vanilla gcc-5 (senza wrapper Clang) supporterà OpenMP e questo dovrebbe essere rilevato da CMake tramite Find_Package.