"undefined reference to `_cmocka_run_group_tests'" when running sample CMocka test

Question

I installed the CMocka testing framework and tried the sample code:

#include <stdarg.h>
#include <stddef.h>
#include <setjmp.h>
#include <cmocka.h>

/* A test case that does nothing and succeeds. */
static void null_test_success(void **state) {
    (void) state; /* unused */
}
int main(void) {
    const struct CMUnitTest tests[] = {
            cmocka_unit_test(null_test_success),
    };
    return cmocka_run_group_tests(tests, NULL, NULL);
}

But when I try to compile I get the following error:

$ gcc -o Tests tests.c
    /tmp/ccbwAXrr.o: In function `main':
    tests.c:(.text+0x5e): undefined reference to `_cmocka_run_group_tests'
    collect2: error: ld returned 1 exit status

What am I missing?

Interlocutrix

Answer 1

Including the header files provides the forward declaration of the functions. To get the function definitions, you need to link with the library.

You can use -l option with gcc to link to the required libarary. You may also need to use -L option to provide the path to the library.

Kuo

I now successfully ran gcc -o Tests tests.c -l cmocka -L /usr/local/lib but I'm pretty sure the -L is redundant. I had forgotten to do ldconfig too, but thankfully there is always a StackOverflow question. – Interlocutrix

@neopostmodern that's why i used may :-) – Kuo

@SouravGhosh - Why is there a 15 minute time limit on accepting an answer in StackOverflow? – Interlocutrix

I have exactly the same problem, but this solutions doesnt help – Gaucherie

The source of my problem was that I called gcc -lcmocka cmockatest.c instead of gcc cmockatest.c -lcmocka. – Gaucherie