CLion - Enabling <math.h> for C projects

Hi Ivan.

Please do the following steps:
1) add #include <math.h>
2) add target_link_libraries(<target_name> m) in CMakeLists.txt
The second command allows you to link with libm for the math functions.

@Alex Alexzander, you just need to add the lib (m) toi your target (log, as defined with add_executable). It should look like this:

cmake_minimum_required(VERSION 3.6)
project(log)

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



set(SOURCE_FILES main.c)
add_executable(log ${SOURCE_FILES})

target_link_libraries(log m)

@It-developer you need to use target_link_libraries() after add_executable().

Hi there,
My CMakeLists.txt contains: 

cmake_minimum_required(VERSION 3.17)
project(tp7dbg C)
set(CMAKE_C_STANDARD 11)
set(GCC_COVERAGE_COMPILE_FLAGS "-Wall")

target_link_libraries(tp7dbg m)
add_executable(tp7dbg main.c)

but Clion outputs:

CMake Error at CMakeLists.txt:6 (target_link_libraries):
Cannot specify link libraries for target "tp7dbg" which is not built by this project.

What's the solution, please?

Best regards.

Fantastic!!! Thanks a lot!! ^_^

I am very new to this and don't understand this answer, yet have the same question. This is my cmake file:

cmake_minimum_required(VERSION 3.5)
project(log)

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

set(SOURCE_FILES main.c)
add_executable(log ${SOURCE_FILES} main.c)

What exactly should it look like to do what you've stated above?

My program still can't find the M_PI :/ 

//---------------------------------------------------------------CMakeList
cmake_minimum_required(VERSION 3.6)
project(Section3_Lecture21_Constants)

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -Wall -pedantic")

set(SOURCE_FILES main.c)
add_executable(Section3_Lecture21_Constants ${SOURCE_FILES})

target_link_libraries(Section3_Lecture21_Constants m)


//--------------------------------------------------------main.c

#include <stdio.h>
#include <math.h>

int main(int argc, char *argv[]) {
    #define PI 3.141593
    printf("%f\n",PI);
    printf("%.10f\n", M_PI);
    return 0;
}

Hi Gautea10, try to user the above macro before the "math.c" inclusion:

#define _USE_MATH_DEFINES

Like that:

#include <stdio.h>
#define _USE_MATH_DEFINES
#include <math.h>

int main(int argc, char *argv[]) {
    #define PI 3.141593
    printf("%f\n",PI);
    printf("%.10f\n", M_PI);
    return 0;
}

Best regards,

Yes, it did help a lot. Thank you Anna ma'am.