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

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2
   3    Tests we warn about overly-large assignments to bitfields.
   4
   5    Source: Neil Booth, 28 Jan 2002.
   6 */
   7
   8 struct bf
   9 {
  10   unsigned int a: 2;
  11   int b: 2;
  12 };
  13
  14 struct bf p = {4, 0};           /* { dg-warning "unsigned conversion from .int. to 'unsigned char:2' changes value from .4. to .0." } */
  15 struct bf q = {0, 2};           /* { dg-warning "overflow in conversion from .int. to .signed char:2. changes value from .2. to .-2." } */
  16 struct bf r = {3, -2};          /* { dg-bogus "(trunc|overflow)" } */
  17
  18 void foo ()
  19 {
  20   p.a = 4, p.b = 0;             /* { dg-warning "unsigned conversion from .int. to .unsigned char:2. changes value from .4. to .0." } */
  21   q.a = 0, q.b = 2;             /* { dg-warning "overflow in conversion from .int. to .signed char:2. changes value from .2. to .-2." } */
  22   r.a = 3, r.b = -2;            /* { dg-bogus "(trunc|overflow)" } */
  23 }