Microsoft VC++ won't compile class C { static const int I=1; }.

Putting initialization into .cc will reduce compiler's abilities
to optimize this constant away.
Defines are not OK as they bloat global namespace.
Looking for a way to declare an efficient named constant in reduced
namespace (i. e. in  a class).
Let's try enums: normally they should be implicitly casted to int.
Let's see if we really have a compiler which won't do that.

libmysqld/lib_sql.cc

@@ -568,7 +568,7 @@ int check_embedded_connection(MYSQL *mysql)
 
 C_MODE_END
 
-bool Protocol::send_fields(List<Item> *list, uint flags)
+bool Protocol::send_fields(List<Item> *list, int flags)
 {
   List_iterator_fast<Item> it(*list);
   Item                     *item;
@@ -615,7 +615,7 @@ bool Protocol::send_fields(List<Item> *list, uint flags)
     if (INTERNAL_NUM_FIELD(client_field))
       client_field->flags|= NUM_FLAG;
 
-    if (flags & Protocol::SEND_DEFAULTS)
+    if (flags & (int) Protocol::SEND_DEFAULTS)
     {
       char buff[80];
       String tmp(buff, sizeof(buff), default_charset_info), *res;

sql/protocol.cc

@@ -498,7 +498,7 @@ void Protocol::init(THD *thd_arg)
 */
 
 #ifndef EMBEDDED_LIBRARY
-bool Protocol::send_fields(List<Item> *list, uint flags)
+bool Protocol::send_fields(List<Item> *list, int flags)
 {
   List_iterator_fast<Item> it(*list);
   Item *item;

sql/protocol.h

@@ -51,10 +51,8 @@ class Protocol
   virtual ~Protocol() {}
   void init(THD* thd_arg);
 
-  static const uint SEND_NUM_ROWS= 1;
-  static const uint SEND_DEFAULTS= 2;
-  static const uint SEND_EOF= 4;
-  virtual bool send_fields(List<Item> *list, uint flags);
+  enum { SEND_NUM_ROWS= 1, SEND_DEFAULTS= 2, SEND_EOF= 4 };
+  virtual bool send_fields(List<Item> *list, int flags);
 
   bool send_records_num(List<Item> *list, ulonglong records);
   bool store(I_List<i_string> *str_list);
@@ -168,7 +166,7 @@ class Protocol_cursor :public Protocol_simple
     prev_record= &data;
     return Protocol_simple::prepare_for_send(item_list);
   }
-  bool send_fields(List<Item> *list, uint flags);
+  bool send_fields(List<Item> *list, int flags);
   bool write();
   uint get_field_count() { return field_count; }
 };

sql/protocol_cursor.cc

@@ -26,7 +26,7 @@
 #include "mysql_priv.h"
 #include <mysql.h>
 
-bool Protocol_cursor::send_fields(List<Item> *list, uint flags)
+bool Protocol_cursor::send_fields(List<Item> *list, int flags)
 {
   List_iterator_fast<Item> it(*list);
   Item                     *item;
@@ -67,7 +67,7 @@ bool Protocol_cursor::send_fields(List<Item> *list, uint flags)
     if (INTERNAL_NUM_FIELD(client_field))
       client_field->flags|= NUM_FLAG;
 
-    if (flags & Protocol::SEND_DEFAULTS)
+    if (flags & (int) Protocol::SEND_DEFAULTS)
     {
       char buff[80];
       String tmp(buff, sizeof(buff), default_charset_info), *res;