gcc -ansi -pedantic accepts some instances of conversion between
	function pointers and object pointers:

		void *v = function;
		(function_type) char_ptr;
		(char *) function;

	That's not valid ANSI C, even with casts.  ANSI 3.2.2.3
	(Pointers), 3.3.4 (Cast operators) and 3.3.16.1 (Simple
	assignment) all explicitly talk about conversion to/from
	pointers to an 'object or incomplete type'; that explicitly
	excludes pointers to functions.

	(Note, the assignment void_ptr = function; does get a warning,
	but the corresponding initialization does not.)

Environment:
System: SunOS bombur.uio.no 5.8 Generic_108528-21 sun4u sparc SUNW,Ultra-5_10
Architecture: sun4

	
host: sparc-sun-solaris2.8
build: sparc-sun-solaris2.8
target: sparc-sun-solaris2.8
configured with: ../gcc-3.3/configure --enable-languages=c,c++,f77 --disable-shared --disable-multilib --prefix=/bombur/tmp/gcc --enable-version-specific-runtime-libs --enable-threads

How-To-Repeat:
bash$ gcc -ansi -pedantic -S a.c
a.c: In function `function':
a.c:5: warning: ISO C forbids initialization between function pointer and `void *'
a.c:6: warning: initialization from incompatible pointer type
a.c:12: warning: assignment from incompatible pointer type
a.c:13: warning: ISO C forbids assignment between function pointer and `void *'
bash$ cat a.c
typedef void (*function_type)(void);

void function(void *void_ptr, char *char_ptr)
{
    function_type func_ptr = void_ptr;  /* warning (ISO C) */
    char *s = function;                 /* warning */

    void *v = function;                 /* should warn */
    (function_type) char_ptr;           /* should warn */
    (char *) function;                  /* should warn */

    char_ptr = function;                /* warning */
    void_ptr = function;                /* warning (ISO C) */
    func_ptr = (void *)0;               /* OK - null pointer constant */
}