clang/test/C/C11/n1356.c

   1 // RUN: %clang_cc1 -verify %s
   2
   3 /* WG14 N1356: Yes
   4  * _Bool bit-fields
   5  */
   6
   7 // C does not allow the bit-width of a bit-field to exceed the width of the
   8 // bit-field type, and _Bool is only required to be able to store 0 and 1
   9 // (and thus is implicitly unsigned), which only requires a single bit.
  10 #if __BOOL_WIDTH__ < __CHAR_BIT__
  11 struct S {
  12   _Bool b : __CHAR_BIT__; // expected-error {{width of bit-field 'b' (8 bits) exceeds the width of its type (1 bit)}}
  13 };
  14 #else
  15 // expected-no-diagnostics
  16 #endif
  17