Index: src/alter.c
==================================================================
--- src/alter.c
+++ src/alter.c
@@ -115,10 +115,11 @@
 
   unsigned const char *z;         /* Pointer to token */
   int n;                          /* Length of token z */
   int token;                      /* Type of token */
 
+  UNUSED_PARAMETER(NotUsed);
   for(z=zInput; *z; z=z+n){
     n = sqlite3GetToken(z, &token);
     if( token==TK_REFERENCES ){
       char *zParent;
       do {

Index: src/fkey.c
==================================================================
--- src/fkey.c
+++ src/fkey.c
@@ -496,12 +496,13 @@
     pLeft = sqlite3Expr(db, TK_REGISTER, 0);
     if( pLeft ){
       /* Set the collation sequence and affinity of the LHS of each TK_EQ
       ** expression to the parent key column defaults.  */
       if( pIdx ){
-        int iCol = pIdx->aiColumn[i];
-        Column *pCol = &pIdx->pTable->aCol[iCol];
+        Column *pCol;
+        iCol = pIdx->aiColumn[i];
+        pCol = &pIdx->pTable->aCol[iCol];
         pLeft->iTable = regData+iCol+1;
         pLeft->affinity = pCol->affinity;
         pLeft->pColl = sqlite3LocateCollSeq(pParse, pCol->zColl);
       }else{
         pLeft->iTable = regData;
@@ -955,11 +956,11 @@
     u8 enableLookaside;           /* Copy of db->lookaside.bEnabled */
     char const *zFrom;            /* Name of child table */
     int nFrom;                    /* Length in bytes of zFrom */
     Index *pIdx = 0;              /* Parent key index for this FK */
     int *aiCol = 0;               /* child table cols -> parent key cols */
-    TriggerStep *pStep;           /* First (only) step of trigger program */
+    TriggerStep *pStep = 0;        /* First (only) step of trigger program */
     Expr *pWhere = 0;             /* WHERE clause of trigger step */
     ExprList *pList = 0;          /* Changes list if ON UPDATE CASCADE */
     Select *pSelect = 0;          /* If RESTRICT, "SELECT RAISE(...)" */
     int i;                        /* Iterator variable */
     Expr *pWhen = 0;              /* WHEN clause for the trigger */