gcc/testsuite/gcc.dg/gnu99-const-expr-2.c

   1 /* Test for constant expressions: __builtin_choose_expr.  */
   2 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=gnu99 -pedantic-errors" } */
   5
   6 #include <limits.h>
   7
   8 int a, b, c;
   9
  10 void
  11 f (void)
  12 {
  13   /* __builtin_choose_expr acts exactly like the chosen argument for
  14      all constant expression purposes.  */
  15   enum e {
  16     E1 = __builtin_choose_expr (1, 1, ++b)
  17   };
  18   /* The first argument to __builtin_choose_expr must be an integer
  19      constant expression.  */
  20   a = __builtin_choose_expr ((void *)0, b, c); /* { dg-error "constant" } */
  21   a = __builtin_choose_expr (0 * (INT_MAX + 1), b, c); /* { dg-warning "integer overflow in expression" } */
  22   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 21 } */
  23   a = __builtin_choose_expr (1 / 0, 0, 0); /* { dg-warning "division by zero" } */
  24   /* { dg-error "not a constant" "error" { target *-*-* } 23 } */
  25   a = __builtin_choose_expr ((1 ? 1 : a), b, c); /* { dg-error "constant" } */
  26 }