clang/test/Sema/cast-to-union.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
   2
   3 union u { int i; unsigned : 3; };
   4 void f(union u);
   5
   6 void test(int x) {
   7   f((union u)x); // expected-warning {{cast to union type is a GNU extension}}
   8   f((union u)&x); // expected-error {{cast to union type from type 'int *' not present in union}}
   9   f((union u)2U); // expected-error {{cast to union type from type 'unsigned int' not present in union}}
  10 }
  11
  12 union u w = (union u)2; // expected-warning {{cast to union type is a GNU extension}}
  13 union u ww = (union u)1.0; // expected-error{{cast to union type from type 'double' not present in union}}
  14 union u x = 7; // expected-error{{initializing 'union u' with an expression of incompatible type 'int'}}
  15 int i;
  16 union u zz = (union u)i; // expected-error{{initializer element is not a compile-time constant}}  expected-warning {{cast to union type is a GNU extension}}
  17
  18 struct s {int a, b;};
  19 struct s y = { 1, 5 };
  20 struct s z = (struct s){ 1, 5 };