unused functions detection utility for c

Question

I am trying to measure my code coverage utilization on a C project consist of several libraries, and main program.

Is there a utility that can help me find which function I dont use from both libraries and main program.

I want to build list of functions (public functions) that are not used by my main program, in order to ignore them in my code coverage report.

Answer 1

If you are using gcc you compile your code with option:

-Wunused-function

Warn whenever a static function is declared but not defined or a non-inline static function is unused. This warning is enabled by -Wall.

Answer 2

cflow can create a call graph for the program, but it doesn't work well with pointers to functions in some cases.

for eaxample:

#include <stdio.h>

static int f1(){
        return 1;
}

int (*p_f1)() = f1;

int main() {
        p_f1();
        return 0;
}