This patch does 1) fix my build breakage 2) Complete the removal of all symbols which could clash with another parser.

sql/mysql_priv.h:
  Porting update
sql/mysqld.cc:
  Porting update
sql/sp.cc:
  Porting update
sql/sql_lex.cc:
  Porting update
sql/sql_lex.h:
  Porting update
sql/sql_parse.cc:
  Porting update
sql/sql_prepare.cc:
  Portinng update
sql/sql_trigger.cc:
  Porting update
sql/sql_view.cc:
  Porting update

sql/mysql_priv.h

@@ -1093,7 +1093,7 @@ File open_binlog(IO_CACHE *log, const char *log_file_name,
                  const char **errmsg);
 
 /* mysqld.cc */
-extern void yyerror(const char*);
+extern void MYSQLerror(const char*);
 
 /* item_func.cc */
 extern bool check_reserved_words(LEX_STRING *name);
@@ -1415,7 +1415,7 @@ void free_list(I_List <i_string_pair> *list);
 void free_list(I_List <i_string> *list);
 
 /* sql_yacc.cc */
-extern int yyparse(void *thd);
+extern int MYSQLparse(void *thd);
 
 /* frm_crypt.cc */
 #ifdef HAVE_CRYPTED_FRM

sql/mysqld.cc

@@ -1524,7 +1524,7 @@ static void network_init(void)
 
 #endif /*!EMBEDDED_LIBRARY*/
 
-void yyerror(const char *s)
+void MYSQLerror(const char *s)
 {
   THD *thd=current_thd;
   char *yytext= (char*) thd->lex->tok_start;

sql/sp.cc

@@ -269,7 +269,7 @@ db_find_routine_aux(THD *thd, int type, sp_name *name, TABLE *table)
 static int
 db_find_routine(THD *thd, int type, sp_name *name, sp_head **sphp)
 {
-  extern int yyparse(void *thd);
+  extern int MYSQLparse(void *thd);
   TABLE *table;
   const char *params, *returns, *body;
   int ret;
@@ -459,7 +459,7 @@ db_load_routine(THD *thd, int type, sp_name *name, sp_head **sphp,
   lex_start(thd, (uchar*)defstr.c_ptr(), defstr.length());
 
   thd->spcont= 0;
-  if (yyparse(thd) || thd->is_fatal_error || newlex.sphead == NULL)
+  if (MYSQLparse(thd) || thd->is_fatal_error || newlex.sphead == NULL)
   {
     sp_head *sp= newlex.sphead;
 

sql/sql_lex.cc

@@ -507,14 +507,14 @@ static inline uint int_token(const char *str,uint length)
 }
 
 /*
-  yylex remember the following states from the following yylex()
+  MYSQLlex remember the following states from the following MYSQLlex()
 
   - MY_LEX_EOQ			Found end of query
   - MY_LEX_OPERATOR_OR_IDENT	Last state was an ident, text or number
 				(which can't be followed by a signed number)
 */
 
-int yylex(void *arg, void *yythd)
+int MYSQLlex(void *arg, void *yythd)
 {
   reg1	uchar c;
   int	tokval, result_state;

sql/sql_lex.h

@@ -716,7 +716,7 @@ typedef struct st_lex
   uchar *buf;			/* The beginning of string, used by SPs */
   uchar *ptr,*tok_start,*tok_end,*end_of_query;
   
-  /* The values of tok_start/tok_end as they were one call of yylex before */
+  /* The values of tok_start/tok_end as they were one call of MYSQLlex before */
   uchar *tok_start_prev, *tok_end_prev;
 
   char *length,*dec,*change,*name;
@@ -1065,7 +1065,7 @@ extern void lex_init(void);
 extern void lex_free(void);
 extern void lex_start(THD *thd, uchar *buf,uint length);
 extern void lex_end(LEX *lex);
-extern int yylex(void *arg, void *yythd);
+extern int MYSQLlex(void *arg, void *yythd);
 
 extern pthread_key(LEX*,THR_LEX);
 

sql/sql_parse.cc

@@ -4244,7 +4244,7 @@ end_with_restore_list:
       /*
         We must cleanup the unit and the lex here because
         sp_grant_privileges calls (indirectly) db_find_routine,
-        which in turn may call yyparse with THD::lex.
+        which in turn may call MYSQLparse with THD::lex.
         TODO: fix db_find_routine to use a temporary lex.
       */
       lex->unit.cleanup();
@@ -5659,7 +5659,7 @@ void mysql_parse(THD *thd, char *inBuf, uint length)
     sp_cache_flush_obsolete(&thd->sp_proc_cache);
     sp_cache_flush_obsolete(&thd->sp_func_cache);
     
-    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
+    if (!MYSQLparse((void *)thd) && ! thd->is_fatal_error)
     {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
       if (mqh_used && thd->user_connect &&
@@ -5739,7 +5739,7 @@ bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
   DBUG_ENTER("mysql_test_parse_for_slave");
 
   mysql_init_query(thd, (uchar*) inBuf, length);
-  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
+  if (!MYSQLparse((void*) thd) && ! thd->is_fatal_error &&
       all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
     error= 1;                  /* Ignore question */
   thd->end_statement();

sql/sql_prepare.cc

@@ -2757,7 +2757,7 @@ bool Prepared_statement::prepare(const char *packet, uint packet_len)
   lex->safe_to_cache_query= FALSE;
   lex->stmt_prepare_mode= TRUE;
 
-  error= yyparse((void *)thd) || thd->is_fatal_error ||
+  error= MYSQLparse((void *)thd) || thd->is_fatal_error ||
       thd->net.report_error || init_param_array(this);
   /*
     While doing context analysis of the query (in check_prepared_statement)

sql/sql_trigger.cc

@@ -15,6 +15,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
 
 
+#define MYSQL_LEX 1
 #include "mysql_priv.h"
 #include "sp_head.h"
 #include "sql_trigger.h"
@@ -932,7 +933,7 @@ bool Table_triggers_list::check_n_load(THD *thd, const char *db,
         lex_start(thd, (uchar*)trg_create_str->str, trg_create_str->length);
 
 	thd->spcont= 0;
-        if (yyparse((void *)thd) || thd->is_fatal_error)
+        if (MYSQLparse((void *)thd) || thd->is_fatal_error)
         {
           /*
             Free lex associated resources.

sql/sql_view.cc

@@ -15,6 +15,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
+#define MYSQL_LEX 1
 #include "mysql_priv.h"
 #include "sql_select.h"
 #include "parse_file.h"
@@ -889,7 +890,7 @@ bool mysql_make_view(THD *thd, File_parser *parser, TABLE_LIST *table)
                                 MODE_IGNORE_SPACE | MODE_NO_BACKSLASH_ESCAPES);
     CHARSET_INFO *save_cs= thd->variables.character_set_client;
     thd->variables.character_set_client= system_charset_info;
-    res= yyparse((void *)thd);
+    res= MYSQLparse((void *)thd);
     thd->variables.character_set_client= save_cs;
     thd->variables.sql_mode= save_mode;
   }