How to set up basic openMP project in CLion [duplicate]

问题

I am trying to run simple OpenMP program in CLion IDE. When I run it I get an ERROR:

CMakeFiles\openmp_test_clion.dir/objects.a(main.cpp.obj): In function `main':
D:/.../openmp_test_clion/main.cpp:9: undefined reference to 'omp_get_thread_num'
collect2.exe: error: ld returned 1 exit status

Here is my code:

#include <stdio.h>
#include <omp.h>

int main()
{
    int id;
#pragma omp parallel private(id)
    {
        id = omp_get_thread_num();
        printf("%d: Hello World!\n", id);
    }
    return 0;
}

Here is my CMakeLists.txt:

cmake_minimum_required(VERSION 3.6)
project(openmp_test_clion)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(SOURCE_FILES main.cpp)
add_executable(openmp_test_clion ${SOURCE_FILES})

message(STATUS "Checking OpenMP")
find_package(OpenMP)
IF(OPENMP_FOUND)
    message("Found OpenMP!)
    # add flags for OpenMP
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${OpenMP_SHARED_LINKER_FLAGS}")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
ELSE()
    message("Missed OpenMP!")
ENDIF()

Here is screen of my toolchains:

I have zero experience with OpenMP and I am beginner programmer in C++ so please give me a bit of an explanation how to setup my project.

回答1:

So after a while I figured it out. I changed CmakeLists.txt as following:

cmake_minimum_required(VERSION 3.6)
project(openmp_test_clion)

# added -fopenmp
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -fopenmp")

set(SOURCE_FILES main.cpp)
add_executable(openmp_test_clion ${SOURCE_FILES})

And I needed to install openmp via TDM-GCC installer .

来源：https://stackoverflow.com/questions/40531078/how-to-set-up-basic-openmp-project-in-clion

标签

c++

cmake

mingw

openmp

clion