gcc/testsuite/gcc.dg/bitfld-20.c

   1 /* Test for bit-field widths not integer constant expressions but
   2    folding to integer constants: PR 42439.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O2 -pedantic" } */
   5
   6 void
   7 f (void)
   8 {
   9   const int m = 1;
  10   ((void)(sizeof(struct { int i:!!m; }))); /* { dg-warning "not an integer constant expression" } */
  11 }