gcc/testsuite/gcc.dg/c99-const-expr-8.c

   1 /* Test for constant expressions: overflow and constant expressions
   2    with -fwrapv: overflows still count as such for the purposes of
   3    constant expressions even when they have defined values at
   4    runtime.  */
   5 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   6 /* { dg-do compile } */
   7 /* { dg-options "-std=iso9899:1999 -pedantic-errors -fwrapv" } */
   8
   9 #include <limits.h>
  10
  11 enum e {
  12   E0 = 0 * (INT_MAX + 1), /* { dg-warning "integer overflow in expression" } */
  13   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 12 } */
  14   E1 = 0 * (INT_MIN / -1), /* { dg-warning "integer overflow in expression" } */
  15   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 14 } */
  16   E2 = 0 * (INT_MAX * INT_MAX), /* { dg-warning "integer overflow in expression" } */
  17   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 16 } */
  18   E3 = 0 * (INT_MIN - 1), /* { dg-warning "integer overflow in expression" } */
  19   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 18 } */
  20   E4 = 0 * (unsigned)(INT_MIN - 1), /* { dg-warning "integer overflow in expression" } */
  21   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 20 } */
  22   E5 = 0 * -INT_MIN, /* { dg-warning "integer overflow in expression" } */
  23   /* { dg-error "overflow in constant expression" "constant" { target *-*-* } 22 } */
  24   E6 = 0 * !-INT_MIN, /* { dg-warning "integer overflow in expression" } */
  25   /* { dg-error "not an integer constant" "constant" { target *-*-* } 24 } */
  26   E7 = INT_MIN % -1 /* Not an overflow.  */
  27 };