1  /* { dg-do compile } */
       2  /* { dg-options "-O2" } */
       3  
       4  #include <stdarg.h>
       5  
       6  extern int error_open_missing_mode (void)
       7    __attribute__((__error__ ("open with O_CREAT needs 3 arguments, only 2 were given")));
       8  extern int warn_open_too_many_arguments (void)
       9    __attribute__((__warning__ ("open called with more than 3 arguments")));
      10  
      11  extern int myopen2 (const char *path, int oflag);
      12  extern int myopenva (const char *path, int oflag, ...);
      13  
      14  extern inline __attribute__((always_inline, gnu_inline)) int
      15  myopen (const char *path, int oflag, ...)
      16  {
      17    if (__builtin_va_arg_pack_len () > 1)
      18      warn_open_too_many_arguments ();	/* { dg-warning "called with more than 3" } */
      19  
      20    if (__builtin_constant_p (oflag))
      21      {
      22        if ((oflag & 0x40) != 0 && __builtin_va_arg_pack_len () < 1)
      23  	{
      24  	  error_open_missing_mode ();	/* { dg-error "needs 3 arguments, only 2 were given" } */
      25  	  return myopen2 (path, oflag);
      26  	}
      27        return myopenva (path, oflag, __builtin_va_arg_pack ());
      28      }
      29  
      30    if (__builtin_va_arg_pack_len () < 1)
      31      return myopen2 (path, oflag);
      32  
      33    return myopenva (path, oflag, __builtin_va_arg_pack ());
      34  }
      35  
      36  int
      37  main (void)
      38  {
      39    myopen ("h", 0x43);
      40    myopen ("i", 0x43, 0644, 0655);
      41    return 0;
      42  }