How to configure CMakeList to link properly?

Question

I'm having a heck of a time understanding the CMake documentation. Most of my programming life has been in C#. So, this is new.

What I have is a directory structure like so:

- bin/  
  -- <empty>  
- include/  
  -- cmocka.h  
  -- cmocka_pbc.h  
  -- cmocka_private.h  
- lib/  
  -- libcmocka.dll.a  
- src/  
  -- jargon/  
  |  -- <*.c *.h>  
- testing/  
  -- jargon_test/  
  |  -- main.c (executable console)  
  |  -- <*.c *.h>  

I've been working on CMakeLists.txt as follows:

cmake_minimum_required(VERSION 3.20)
project(jargon_test C)

set(CMAKE_C_STANDARD 11)

add_executable(jargon_test main.c token_tests.h token_tests.c)

include_directories(
        "../../src/jargon/"
        "../../include"
)

add_library(cmocka SHARED IMPORTED)
set_target_properties(cmocka
        PROPERTIES
        IMPORTED_LOCATION "../../lib/libcmocka.dll.a"
        INTERFACE_INCLUDE_DIRECTORIES "../../include/cmocka"
)

I'm using CLion 2021.2.3.

Trying to build, I get the following errors:

CMakeFiles\jargon_test.dir/objects.a(token_tests.c.obj): In function test_hello': *directory*:29: undefined reference to _assert_true`

CMakeFiles\jargon_test.dir/objects.a(token_tests.c.obj): In function run_token_tests': *directory*:47: undefined reference to _cmocka_run_group_tests`

The source itself has no issues. But, for completeness, here are the source files:

// token_tests.h
#include <stdio.h>
#include <stdarg.h>
#include <stddef.h>
#include <setjmp.h>
#include <stdint.h>
#include <cmocka.h>

#include "jargon.h"


#ifndef JARGON_TOKEN_TESTS_H
#define JARGON_TOKEN_TESTS_H

void test_hello(void ** state);

int setup(void ** state);
int teardown(void ** state);

int run_token_tests(void);
#endif //JARGON_TOKEN_TESTS_H


// token_tests.c
#include "token_tests.h"


void test_hello(void ** state) {
    int ret = 0;
    assert_true(ret == 0);
}

int setup (void ** state) {
    printf("executing test\n");

    return 0;
}

int teardown (void ** state) {
    return 0;
}

int run_token_tests(void) {
    const struct CMUnitTest tests [] = {
            cmocka_unit_test(test_hello)
    };

    int count_fail_tests = cmocka_run_group_tests(tests, setup, teardown);

    return count_fail_tests;
}

Answer 1

It seems the cmocka library is not linked to your executable, add target_link_libraries(jargon_test cmocka)

Also, maybe some of your function definitions (implementation in c files) are not given to the cmake script.

Try to update your cmake script like this:

e been working on CMakeLists.txt as follows:

cmake_minimum_required(VERSION 3.20)
project(jargon_test C)

set(CMAKE_C_STANDARD 11)

add_executable(jargon_test main.c token_tests.h token_tests.c ../../src/jargon/xxxx.c)

include_directories(
        "../../src/jargon/"
        "../../include"
)

add_library(cmocka SHARED IMPORTED)
set_target_properties(cmocka
        PROPERTIES
        IMPORTED_LOCATION "../../lib/libcmocka.dll.a"
        INTERFACE_INCLUDE_DIRECTORIES "../../include/cmocka"
} 

target_link_libraries(jargon_test cmocka) 

To have more clean cmake scripts, try to adopt a top to down approach (with a top level CMakeLists.txt including other ones located in subdirectories) and to declare a "jargon" library in your src/jargon folder. Thus, in your test folder you will only have to add c test files and to link your "jargon" library and your test harness.