Interfacing with C in 2.066.1

[Jason den Dulk via Digitalmars-d]

On Saturday, 8 November 2014 at 10:52:16 UTC, Gary Willoughby 
wrote:

> const(char)* foo()

This fixed the const issue. Thanks for that guys.

> Have you got an example of the struct giving you problems?

struct st_mysql_res {
   my_ulonglong  row_count;
   MYSQL_FIELD	*fields;
   MYSQL_DATA	*data;
   MYSQL_ROWS	*data_cursor;
   ulong *lengths;		/* column lengths of current row */
   MYSQL		*handle;		/* for unbuffered reads */
   st_mysql_methods *methods;
   MYSQL_ROW	row;			/* If unbuffered read */
   MYSQL_ROW	current_row;		/* buffer to current row */
   MEM_ROOT	field_alloc;
   uint	field_count, current_field;
   my_bool	eof;			/* Used by mysql_fetch_row */
   /* mysql_stmt_close() had to cancel this result */
   my_bool       unbuffered_fetch_cancelled;
   void *extension;
}

The struct is never instantised anywhere. It is always referenced 
by pointer.

The error message is:
undefined reference to 
`_D6jaypha5dbsql5mysql1c5mysql12st_mysql_res6__initZ'

A search of the raw object file generated produces the above 
reference, however when disassembling the file, it disappears. 
Not sure what the significance of that is.