+
−/* Test for bit-field widths not integer constant expressions but
+
−   folding to integer constants: PR 42439.  */
+
−/* { dg-do compile } */
+
−/* { dg-options "-O2" } */
+
−
+
−void
+
−f (void)
+
−{
+
−  const int m = 1;
+
−  ((void)(sizeof(struct { int i:!!m; })));
+
−}