CODEWITHSUNDEEP
cdebugginggccclangclion
Magnus Wang
Magnus Wang

Reputation: 180

CLion debugger not working when using gcc

Im trying to configure CLion so that I can use openMP. When using the default settings on my Mac, the compiler is clang. Default Apple clang does not support openMP.

When I change my compiler to GCC, the debugger will not stop at breakpoints. The program just runs as it would when executing the compiled file.

The CMakeLists.txt file below works perfectly with CLion debugger. When I uncomment out the compiler flags, the debugger ignores the breakpoints. 

cmake_minimum_required(VERSION 3.8)
project(CLionTest)

set(CMAKE_C_STANDARD 99)
#set(CMAKE_C_COMPILER /usr/local/bin/gcc-7)
#set(CMAKE_C_FLAGS -fopenmp)
#set(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")

set(MAIN main.c)
add_executable(CLionTest ${MAIN})

add_custom_target(CLionTestMake COMMAND make all WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})

How do I fix this?

Toolchain settings: CMake executable: Bundeled CMake 3.8.2 Debugger: Bundled LLDB 3.9.0

main.c:

#include <stdio.h>
#include <unistd.h>
#ifdef _OPENMP
  #include <omp.h>
#endif

int main() {
    printf("Hello, World!\n");

    #pragma omp parallel
    {
        #ifdef _OPENMP
          int size = omp_get_num_threads();
          int rank = omp_get_thread_num();
        #else
          int rank = 0;
          int size = 1;
        #endif
        printf("%d/%d\n", rank, size);
    };

    return 0;
}

Upvotes: 1

Views: 3130

Answers (1)

Matteo Italia
Matteo Italia

Reputation: 126937

set(CMAKE_C_FLAGS -fopenmp)
set(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")

You are replacing the C flags instead of appending them, so you are dropping the builtin -g option that generates debug symbols. Instead, do

set(CMAKE_C_FLAGS "${CMAKE_CFLAGS} -fopenmp")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG")

Upvotes: 3

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