gcc/testsuite/gcc.dg/c90-static-1.c

   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()); }