Why can't I cast a function pointer to (void *)?
<p>I have a function that takes a string, an array of strings, and an array of pointers, and looks for the string in the array of strings, and returns the corresponding pointer from the array of pointers.  Since I use this for several different things, the pointer array is declared as an array of (void *), and the caller should know what kind of pointers are actually there (and hence what kind of a pointer it gets back as the return value).</p>

<p>When I pass in an array of function pointers, however, I get a warning when I compile with <code>-Wpedantic</code>:</p>

<p>clang:</p>

<pre><code>test.c:40:8: warning: assigning to 'voidfunc' (aka 'void (*)(void)') from 'void *' converts
      between void pointer and function pointer [-Wpedantic]
</code></pre>

<p>gcc:</p>

<pre><code>test.c:40:8: warning: ISO C forbids assignment between function pointer and ‘void *’ [-Wpedantic]
   fptr = find_ptr("quux", name_list, (void **)ptr_list,
</code></pre>

<p>Here's a test file, which despite the warning does correctly print "quux":</p>

<pre><code>#include &lt;stdio.h&gt;
#include &lt;string.h&gt;

void foo(void)
{
  puts("foo");
}

void bar(void)
{
  puts("bar");
}

void quux(void)
{
  puts("quux");
}

typedef void (* voidfunc)(void);

voidfunc ptr_list[] = {foo, bar, quux};

char *name_list[] = {"foo", "bar", "quux"};

void *find_ptr(char *name, char *names[], void *ptrs[], int length)
{
  int i;

  for (i = 0; i &lt; length; i++) {
    if (strcmp(name, names[i]) == 0) {
      return ptrs[i];
    }
  }
  return NULL;
}

int main() {
  voidfunc fptr;

  fptr = find_ptr("quux", name_list, (void **)ptr_list,
                  sizeof(ptr_list) / sizeof(ptr_list[0]));
  fptr();

  return 0;
}
</code></pre>

<p>Is there any way to fix the warning, other than not compiling with <code>-Wpedantic</code>, or duplicating my find_ptr function, once for function pointers and once for non-function pointers?  Is there a better way to achieve what I'm trying to do?</p>