#include <glib.h>
#include <stdlib.h>

typedef enum { A = 0xaa } __attribute__((__packed__)) MyType;

static void func(char *first_name, ...)
{
  char *name = first_name;
  va_list args;

  va_start (args, first_name);
  while (name) {
    int* value = va_arg (args, int*);
    *value = A;
    name = va_arg (args, char*);
  }
}

int main(void) {
  g_print ("sizeof: %d\n", sizeof (MyType));
  MyType wert = 0;
  func ("a", &wert, NULL);
  g_print ("Wert: %d\n", wert);
  return 0; /* crashes on exit! */
}

/* Conclusion: it is not safe to use pointers to enum types in varargs calls */