Fix problems with the WatCom C compiler: Arrays must contain at least one

element.  sqlite3FreeX declared properly.  Don't allow run-time expression
(the SQLITE_UTF16NATIVE macro) in an array initializer. (CVS 1640)

FossilOrigin-Name: fbfc3c95a8abf25bb9e2b44cfeb7186c5b0591d7

src/vdbeInt.h

@@ -181,13 +181,23 @@ struct Sorter {
 */
 #define MEM_AggCtx    0x0400  /* Mem.z points to an agg function context */
 
+
+/* A VdbeFunc is just a FuncDef (defined in sqliteInt.h) that contains
+** additional information about auxiliary information bound to arguments
+** of the function.  This is used to implement the sqlite3_get_auxdata()
+** and sqlite3_set_auxdata() APIs.  The "auxdata" is some auxiliary data
+** that can be associated with a constant argument to a function.  This
+** allows functions such as "regexp" to compile their constant regular
+** expression argument once and reused the compiled code for multiple
+** invocations.
+*/
 struct VdbeFunc {
-  FuncDef *pFunc;
-  int nAux;
+  FuncDef *pFunc;               /* The definition of the function */
+  int nAux;                     /* Number of entries allocated for apAux[] */
   struct AuxData {
-    void *pAux;
-    void (*xDelete)(void *);
-  } apAux[0];
+    void *pAux;                   /* Aux data for the i-th argument */
+    void (*xDelete)(void *);      /* Destructor for the aux data */
+  } apAux[1];                   /* One slot for each function argument */
 };
 typedef struct VdbeFunc VdbeFunc;