Index: testsuite/g++.dg/expr/bool3.C
===================================================================
--- testsuite/g++.dg/expr/bool3.C	(revision 0)
+++ testsuite/g++.dg/expr/bool3.C	(revision 0)
@@ -0,0 +1,21 @@
+// { dg-do run }
+// PR C++/29295
+// make sure that a typedef for a bool will have the
+//  the same results as a bool itself.
+
+extern "C" void abort();
+typedef volatile bool my_bool;
+int main()
+{ 
+  my_bool b = false;
+  int i;
+
+  b++;
+  b++;
+  i = b;
+  if (i != 1)
+    abort ();
+  return 0;
+}
+
+
Index: testsuite/g++.dg/expr/bool4.C
===================================================================
--- testsuite/g++.dg/expr/bool4.C	(revision 0)
+++ testsuite/g++.dg/expr/bool4.C	(revision 0)
@@ -0,0 +1,13 @@
+// { dg-do compile }
+// make sure that a typedef for a bool will have the
+//  the same results as a bool itself.
+
+
+typedef volatile bool my_bool;
+int main()
+{
+  my_bool b = false;
+  b--; // { dg-error "" }
+  return 0;
+}
+
Index: cp/typeck.c
===================================================================
--- cp/typeck.c	(revision 146200)
+++ cp/typeck.c	(working copy)
@@ -4468,7 +4468,7 @@ cp_build_unary_op (enum tree_code code, 
 	  return error_mark_node;
 
 	/* Forbid using -- on `bool'.  */
-	if (same_type_p (declared_type, boolean_type_node))
+	if (TREE_CODE (declared_type) == BOOLEAN_TYPE)
 	  {
 	    if (code == POSTDECREMENT_EXPR || code == PREDECREMENT_EXPR)
 	      {