Cmake funktioniert nicht mit OpenMP auf Maverick

Question

Ich verwende OpenMP, um parallelen Code zu schreiben. Hier ist ein Abschnitt von den CMakeLists in meinem Fall.

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() 

Aber wenn wir cmake .. beginnen, scheint es, dass es nicht OpenMP Paket DEOS finden, und ich bekomme diese Fehlermeldung

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) 

Hier ist 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} 


) 

Wie kann ich das reparieren? Ich bin sicher, dass openMPi installiert ist und es auf opt/local/include

Answer 1

OpenMP und MPI sind zwei völlig verschiedene Dinge.

OMP erfordert Compiler-Unterstützung, die unter OS X benötigen Sie über Homebrew. (Sie können MPI auch über Homebrew installieren, was nett ist).

brew install clang-omp 

Nachdem Sie Klirren-omp installiert haben, können Sie dann CMake sagen, dass Compiler zu verwenden, indem es wie so aufrufen.

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

Answer 2

Zusätzlich zu der obigen Antwort können Sie auch gcc-5/g ++ - 5 von homebrew installieren. Die einfache gcc-5-Installation (ohne Clang-Wrapper) unterstützt OpenMP und dies sollte von CMake über Find_Package erkannt werden.