1  /* It is a constraint violation for a static function to be declared
       2     but not defined if it is used except in a sizeof expression.  The
       3     use of the function simply being unevaluated is not enough.  */
       4  /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
       5  /* { dg-do compile } */
       6  /* { dg-options "-O2 -std=iso9899:1990 -pedantic-errors" } */
       7  
       8  /* Constraint violation (trivial case, where function is used).  */
       9  static void f0(void); /* { dg-error "used but never defined" } */
      10  void g0(void) { f0(); }
      11  
      12  /* Constraint violation.  */
      13  static void f1(void); /* { dg-error "used but never defined" } */
      14  void g1(void) { if (0) { f1(); } }
      15  
      16  /* Constraint violation.  */
      17  static int f2(void); /* { dg-error "used but never defined" } */
      18  void g2(void) { 0 ? f2() : 0; }
      19  
      20  /* OK.  */
      21  static int f3(void);
      22  void g3(void) { sizeof(f3()); }