src/libs/libGL.c:28: warning: ISO C forbids conversion of object pointer to function pointer type

#define chain(name, ...) ({ \
        static __typeof__(&name) next; \
        if (__builtin_expect(next == NULL, 0)) \
                next = (__typeof__(next)) dlsym(RTLD_NEXT, #name); \
        (*next)(__VA_ARGS__); }) \


void (*glXGetProcAddressARB(const GLubyte *procName)) (void)
{
+---  5 lines: if (strcmp((char *)procName, "glXGetProcAddressARB") == 0) {-----

        return chain(glXGetProcAddressARB, procName); /* <------- line 28 of src/libs/libGL.c */
}