Fixed compiler warnings from gcc 4.0.2:

- Added empty constructors and virtual destructors to many classes and structs
- Removed some usage of the offsetof() macro to instead use C++ class pointers

1 files changed, 3 insertions, 0 deletions

diff --git a/sql/parse_file.h b/sql/parse_file.h
index afa88da2ead..0d5a215fe1a 100644
--- a/sql/parse_file.h
+++ b/sql/parse_file.h
@@ -49,6 +49,8 @@ struct File_option
 class Unknown_key_hook
 {
 public:
+  Unknown_key_hook() {}                       /* Remove gcc warning */
+  virtual ~Unknown_key_hook() {}              /* Remove gcc warning */
   virtual bool process_unknown_string(char *&unknown_key, gptr base,
                                       MEM_ROOT *mem_root, char *end)= 0;
 };
@@ -59,6 +61,7 @@ public:
 class File_parser_dummy_hook: public Unknown_key_hook
 {
 public:
+  File_parser_dummy_hook() {}                 /* Remove gcc warning */
   virtual bool process_unknown_string(char *&unknown_key, gptr base,
                                       MEM_ROOT *mem_root, char *end);
 };