Index: src/Common/SemanticError.h
===================================================================
--- src/Common/SemanticError.h	(revision d046db2ac11262165d9c13d2f62d3fff987a4f36)
+++ src/Common/SemanticError.h	(revision 9dc31c106f1a43094de3a5a6e85d3125948b4ef9)
@@ -10,6 +10,6 @@
 // Created On       : Mon May 18 07:44:20 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Tue Aug 29 22:03:36 2017
-// Update Count     : 17
+// Last Modified On : Wed Apr 18 16:28:16 2018
+// Update Count     : 18
 //
 
@@ -39,4 +39,5 @@
 	"self assignment of expression: %s",
 	"rvalue to reference conversion of rvalue: %s",
+	"questionable use of type qualifier %s with %s",
 };
 
@@ -44,4 +45,5 @@
 	SelfAssignment,
 	RvalueToReferenceConversion,
+	BadQualifiersZeroOne,
 	NUMBER_OF_WARNINGS, //This MUST be the last warning
 };
Index: src/Common/utility.h
===================================================================
--- src/Common/utility.h	(revision d046db2ac11262165d9c13d2f62d3fff987a4f36)
+++ src/Common/utility.h	(revision 9dc31c106f1a43094de3a5a6e85d3125948b4ef9)
@@ -9,7 +9,7 @@
 // Author           : Richard C. Bilson
 // Created On       : Mon May 18 07:44:20 2015
-// Last Modified By : Andrew Beach
-// Last Modified On : Thr Aug 17 11:38:00 2017
-// Update Count     : 34
+// Last Modified By : Peter A. Buhr
+// Last Modified On : Thu Apr 19 16:21:44 2018
+// Update Count     : 37
 //
 
@@ -436,4 +436,18 @@
 }
 
+// -----------------------------------------------------------------------------
+// O(1) polymorphic integer log2, using clz, which returns the number of leading 0-bits, starting at the most
+// significant bit (single instruction on x86)
+
+template<typename T>
+inline constexpr T log2(const T & t) {
+	if ( std::is_integral<T>::value ) {
+		const constexpr int r = sizeof(t) * __CHAR_BIT__ - 1;
+		if ( sizeof(T) == sizeof(unsigned int ) ) return r - __builtin_clz( t );
+		if ( sizeof(T) == sizeof(unsigned long) ) return r - __builtin_clzl( t );
+		if ( sizeof(T) == sizeof(unsigned long long) ) return r - __builtin_clzll( t );
+	} // if
+	return -1;
+}
 
 
Index: src/Parser/DeclarationNode.cc
===================================================================
--- src/Parser/DeclarationNode.cc	(revision d046db2ac11262165d9c13d2f62d3fff987a4f36)
+++ src/Parser/DeclarationNode.cc	(revision 9dc31c106f1a43094de3a5a6e85d3125948b4ef9)
@@ -10,6 +10,6 @@
 // Created On       : Sat May 16 12:34:05 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Thu Feb 22 15:37:17 2018
-// Update Count     : 1033
+// Last Modified On : Thu Apr 19 15:09:29 2018
+// Update Count     : 1062
 //
 
@@ -47,5 +47,5 @@
 const char * DeclarationNode::aggregateNames[] = { "struct", "union", "trait", "coroutine", "monitor", "thread", "NoAggregateNames" };
 const char * DeclarationNode::typeClassNames[] = { "otype", "dtype", "ftype", "NoTypeClassNames" };
-const char * DeclarationNode::builtinTypeNames[] = { "__builtin_va_list", "NoBuiltinTypeNames" };
+const char * DeclarationNode::builtinTypeNames[] = { "__builtin_va_list", "zero_t", "one_t", "NoBuiltinTypeNames" };
 
 UniqueName DeclarationNode::anonymous( "__anonymous" );
@@ -561,4 +561,8 @@
 
 	checkQualifiers( type, q->type );
+	if ( (builtin == Zero || builtin == One) && error.length() == 0 ) {
+		SemanticWarning( yylloc, Warning::BadQualifiersZeroOne, Type::QualifiersNames[log2( q->type->qualifiers.val )], builtinTypeNames[builtin] );
+//		appendError( error, string( "questionable qualifiers" ) );
+	} // if
 	addQualifiersToType( q->type, type );
 
Index: src/Parser/TypeData.cc
===================================================================
--- src/Parser/TypeData.cc	(revision d046db2ac11262165d9c13d2f62d3fff987a4f36)
+++ src/Parser/TypeData.cc	(revision 9dc31c106f1a43094de3a5a6e85d3125948b4ef9)
@@ -10,6 +10,6 @@
 // Created On       : Sat May 16 15:12:51 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Thu Feb 22 15:49:00 2018
-// Update Count     : 597
+// Last Modified On : Tue Apr 17 23:00:52 2018
+// Update Count     : 602
 //
 
@@ -395,5 +395,5 @@
 		break;
 	  case Builtin:
-		os << "gcc builtin type";
+		os << DeclarationNode::builtinTypeNames[builtintype];
 		break;
 	  default: