Cmake无法在Maverick上使用openMP

Cmake does not work with openMP on Maverick

本文关键字：openMP Maverick Cmake      更新时间：2023-10-16

我正在使用OpenMP编写并行代码。这是在我的案例中使用的CMakeLists的一部分。

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()

但是，当我们开始cmake。。，它似乎没有找到OpenMP包，我得到这个错误

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)

这里是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}

)

我该怎么解决？我确信openMPi已经安装，并且它位于opt/local/include 上

OpenMP和MPI是两个完全不同的东西。

OMP需要编译器支持，而在OSX上，您需要通过Homebrew获得编译器支持。（您也可以通过Homebrew安装MPI，这很好）。

brew install clang-omp

安装clang omp后，您可以通过调用它来告诉CMake使用该编译器

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

除了上面的答案，您还可以从自制程序安装gcc-5/g++-5。普通的gcc-5安装（没有Clang包装）将支持OpenMP，这应该由CMake通过Find_Package检测到。

一个解决方案是安装并使用GNU GCC。假设您已安装或将通过HomeBrew brew install gcc:安装

if(APPLE)
  set(CMAKE_C_COMPILER "/usr/local/bin/gcc-9")
  set(CMAKE_CXX_COMPILER "/usr/local/bin/g++-9")
  set(CMAKE_Fortran_COMPILER "/usr/local/bin/gfortran")
endif()

CCD_ 2版本可能在此时发生变化。

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