Add multiple parsing protection to include/mysqld_error.h

extra/comp_err.c

@@ -267,6 +267,7 @@ static int create_header_files(struct errors *error_head)
   fprintf(sql_statef, "/* Autogenerated file, please don't edit */\n\n");
   fprintf(er_namef, "/* Autogenerated file, please don't edit */\n\n");
 
+  fprintf(er_definef, "#ifndef ER_ERROR_FIRST\n");
   fprintf(er_definef, "#define ER_ERROR_FIRST %d\n", error_head->d_code);
 
   current_d_code= error_head->d_code -1;
@@ -314,6 +315,7 @@ static int create_header_files(struct errors *error_head)
   }
   /* finishing off with mysqld_error.h */
   fprintf(er_definef, "#define ER_ERROR_LAST %d\n", er_last);
+  fprintf(er_definef, "#endif /* ER_ERROR_FIRST */\n");
   my_fclose(er_definef, MYF(0));
   my_fclose(sql_statef, MYF(0));
   my_fclose(er_namef, MYF(0));