gcc/testsuite/gcc.dg/cast-2.c

   1 /* Test diagnostics for bad or doubtful casts.  Test with
   2    -pedantic.  */
   3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=gnu99 -pedantic" } */
   6
   7 struct s { int a; } sv;
   8 union u { int a; } uv;
   9 int i;
  10 long l;
  11 char c;
  12 void *p;
  13 float fv;
  14
  15 void
  16 f (void)
  17 {
  18   (int []) p; /* { dg-error "cast specifies array type" } */
  19   (int ()) p; /* { dg-error "cast specifies function type" } */
  20   (struct s) sv; /* { dg-warning "ISO C forbids casting nonscalar to the same type" } */
  21   (union u) uv; /* { dg-warning "ISO C forbids casting nonscalar to the same type" } */
  22   (struct s) i; /* { dg-error "conversion to non-scalar type requested" } */
  23   (union u) i; /* { dg-warning "ISO C forbids casts to union type" } */
  24   (union u) l; /* { dg-error "cast to union type from type not present in union" } */
  25   (int) sv; /* { dg-error "aggregate value used where an integer was expected" } */
  26   (int) uv; /* { dg-error "aggregate value used where an integer was expected" } */
  27   (float) sv; /* { dg-error "aggregate value used where a floating-point was expected" } */
  28   (float) uv; /* { dg-error "aggregate value used where a floating-point was expected" } */
  29   (_Complex double) sv; /* { dg-error "aggregate value used where a complex was expected" } */
  30   (_Complex double) uv; /* { dg-error "aggregate value used where a complex was expected" } */
  31   (void *) sv; /* { dg-error "cannot convert to a pointer type" } */
  32   (void *) uv; /* { dg-error "cannot convert to a pointer type" } */
  33   (_Bool) sv; /* { dg-error "used struct type value where scalar is required" } */
  34   (_Bool) uv; /* { dg-error "used union type value where scalar is required" } */
  35   (void) sv;
  36   (const void) uv;
  37   (void *) c; /* { dg-warning "cast to pointer from integer of different size" } */
  38   (void *) (char) 1;
  39   (char) p; /* { dg-warning "cast from pointer to integer of different size" } */
  40   (char) (void *) 1; /* { dg-warning "cast from pointer to integer of different size" } */
  41 }