clang-tests/gcc-4_2-testsuite/src/gcc.dg/bitfld-2.c

/* Copyright (C) 2002 Free Software Foundation, Inc.

   Tests we warn about overly-large assignments to bitfields.

   Source: Neil Booth, 28 Jan 2002.
*/

struct bf
{
  unsigned int a: 2;
  int b: 2;
};

struct bf p = {4, 0};          /* { dg-warning "implicit truncation from 'int' to bitfield changes value from 4 to 0" } */
struct bf q = {0, 2};          /* { dg-warning "implicit truncation from 'int' to bitfield changes value from 2 to -2" } */
struct bf r = {3, -2};

void foo ()
{
  p.a = 4, p.b = 0;            /* { dg-warning "implicit truncation from 'int' to bitfield changes value from 4 to 0" } */
  q.a = 0, q.b = 2;            /* { dg-warning "implicit truncation from 'int' to bitfield changes value from 2 to -2" } */
  r.a = 3, r.b = -2;
}