gcc/testsuite/gcc.dg/c99-const-expr-7.c

   1 /* Test for constant expressions: overflow and constant expressions;
   2    see also overflow-warn-*.c for some other cases.  */
   3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
   6
   7 #include <float.h>
   8 #include <limits.h>
   9
  10 int a = DBL_MAX; /* { dg-warning "overflow in conversion" } */
  11 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } .-1 } */
  12 int b = (int) DBL_MAX; /* { dg-error "overflow" } */
  13 unsigned int c = -1.0; /* { dg-warning "overflow in conversion" } */
  14 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } .-1 } */
  15 unsigned int d = (unsigned)-1.0; /* { dg-error "overflow" } */
  16
  17 int e = 0 << 1000; /* { dg-warning "shift count" } */
  18 /* { dg-error "constant" "constant" { target *-*-* } .-1 } */
  19 int f = 0 << -1; /* { dg-warning "shift count" } */
  20 /* { dg-error "constant" "constant" { target *-*-* } .-1 } */
  21 int g = 0 >> 1000; /* { dg-warning "shift count" } */
  22 /* { dg-error "constant" "constant" { target *-*-* } .-1 } */
  23 int h = 0 >> -1; /* { dg-warning "shift count" } */
  24 /* { dg-error "constant" "constant" { target *-*-* } .-1 } */
  25
  26 int b1 = (0 ? (int) DBL_MAX : 0);
  27 unsigned int d1 = (0 ? (unsigned int)-1.0 : 0);
  28 int e1 = (0 ? 0 << 1000 : 0);
  29 int f1 = (0 ? 0 << -1 : 0);
  30 int g1 = (0 ? 0 >> 1000 : 0);
  31 int h1 = (0 ? 0 >> -1: 0);
  32
  33 int i = -1 << 0;
  34 /* { dg-error "constant" "constant" { target *-*-* } .-1 } */
  35
  36 int j[1] = { DBL_MAX }; /* { dg-warning "overflow in conversion" } */
  37 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } .-1 } */
  38
  39 int array[2] = { [0 * (INT_MAX + 1)] = 0 }; /* { dg-warning "integer overflow in expression" } */
  40 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } .-1 } */
  41
  42 _Bool k = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
  43 /* { dg-error "overflow in constant expression" "constant" { target *-*-* } .-1 } */