gcc/testsuite/gcc.dg/c90-const-expr-6.c

   1 /* Test for constant expressions: operands and casts not permitted in
   2    integer constant expressions.  */
   3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
   6
   7 __extension__ typedef __INTPTR_TYPE__ intptr_t;
   8
   9 /* PR 29116.  */
  10 int n = 0, p[n * 0 + 1]; /* { dg-error "variabl|can't be evaluated" } */
  11
  12 /* PR 31871.  */
  13 extern int c[1 + ((intptr_t) (void *) 0)]; /* { dg-error "variab|can't be evaluated" } */
  14
  15 /* Implicit conversions from floating-point constants are not OK,
  16    although explicit ones are.  */
  17 extern int c1[1.0 ? 1 : 0]; /* { dg-error "variab|can't be evaluated" } */
  18
  19 extern int c2[(int)1.0 ? 1 : 0];
  20
  21 extern int c3[1.0 && 1]; /* { dg-error "variab|can't be evaluated" } */
  22
  23 extern int c4[(int)1.0 && 1];
  24
  25 extern int c5[1.0 || 1]; /* { dg-error "variab|can't be evaluated" } */
  26
  27 extern int c6[(int)1.0 || 1];
  28
  29 /* Similar with various other cases where integer constant expressions
  30    are required.  */
  31
  32 struct s {
  33   int a : (n * 0 + 1); /* { dg-error "constant" } */
  34 };
  35
  36 enum e {
  37   E = (1 + ((intptr_t) (void *) 0)), /* { dg-error "constant" } */
  38   E2 = 0
  39 };
  40
  41 enum f {
  42   F = (1 ? 1 : n), /* { dg-error "constant" } */
  43   F2 = 0
  44 };
  45
  46 void
  47 f (int a)
  48 {
  49   int v[1 + ((intptr_t) (void *) 0)]; /* { dg-error "variab|can't be evaluated" } */
  50   switch (a)
  51     {
  52     case (n * 0 + 1): /* { dg-error "constant" } */
  53       ;
  54     }
  55 }