Fix harmless compiler warnings when using -W4 with MSVC.

FossilOrigin-Name: e693e11d1b9265974c32bddba873ea30a4d0b708

6 files changed, 10 insertions, 8 deletions

diff --git a/ext/fts3/fts3.c b/ext/fts3/fts3.c
index 2b93c6271..fe28eb2cf 100644
--- a/ext/fts3/fts3.c
+++ b/ext/fts3/fts3.c
@@ -1853,7 +1853,7 @@ static int fts3SelectLeaf(
   sqlite3_int64 *piLeaf,          /* Selected leaf node */
   sqlite3_int64 *piLeaf2          /* Selected leaf node */
 ){
-  int rc;                         /* Return code */
+  int rc = SQLITE_OK;             /* Return code */
   int iHeight;                    /* Height of this node in tree */
 
   assert( piLeaf || piLeaf2 );
@@ -1864,7 +1864,7 @@ static int fts3SelectLeaf(
 
   if( rc==SQLITE_OK && iHeight>1 ){
     char *zBlob = 0;              /* Blob read from %_segments table */
-    int nBlob;                    /* Size of zBlob in bytes */
+    int nBlob = 0;                /* Size of zBlob in bytes */
 
     if( piLeaf && piLeaf2 && (*piLeaf!=*piLeaf2) ){
       rc = sqlite3Fts3ReadBlock(p, *piLeaf, &zBlob, &nBlob, 0);
@@ -3086,7 +3086,7 @@ static int fts3FilterMethod(
   int nVal,                       /* Number of elements in apVal */
   sqlite3_value **apVal           /* Arguments for the indexing scheme */
 ){
-  int rc;
+  int rc = SQLITE_OK;
   char *zSql;                     /* SQL statement used to access %_content */
   int eSearch;
   Fts3Table *p = (Fts3Table *)pCursor->pVtab;
diff --git a/ext/fts3/fts3_tokenize_vtab.c b/ext/fts3/fts3_tokenize_vtab.c
index 364852ef8..fb99f8b80 100644
--- a/ext/fts3/fts3_tokenize_vtab.c
+++ b/ext/fts3/fts3_tokenize_vtab.c
@@ -163,7 +163,7 @@ static int fts3tokConnectMethod(
   sqlite3_vtab **ppVtab,          /* OUT: New sqlite3_vtab object */
   char **pzErr                    /* OUT: sqlite3_malloc'd error message */
 ){
-  Fts3tokTable *pTab;
+  Fts3tokTable *pTab = 0;
   const sqlite3_tokenizer_module *pMod = 0;
   sqlite3_tokenizer *pTok = 0;
   int rc;
diff --git a/ext/fts3/fts3_write.c b/ext/fts3/fts3_write.c
index 0da08c62d..09294bc45 100644
--- a/ext/fts3/fts3_write.c
+++ b/ext/fts3/fts3_write.c
@@ -3082,8 +3082,8 @@ static int fts3PromoteSegments(
 
     if( bOk ){
       int iIdx = 0;
-      sqlite3_stmt *pUpdate1;
-      sqlite3_stmt *pUpdate2;
+      sqlite3_stmt *pUpdate1 = 0;
+      sqlite3_stmt *pUpdate2 = 0;
 
       if( rc==SQLITE_OK ){
         rc = fts3SqlStmt(p, SQL_UPDATE_LEVEL_IDX, &pUpdate1, 0);
diff --git a/ext/misc/amatch.c b/ext/misc/amatch.c
index d869dbd8d..98c01431b 100644
--- a/ext/misc/amatch.c
+++ b/ext/misc/amatch.c
@@ -398,7 +398,7 @@ static amatch_avl *amatchAvlInsert(amatch_avl **ppHead, amatch_avl *pNew){
 */
 static void amatchAvlRemove(amatch_avl **ppHead, amatch_avl *pOld){
   amatch_avl **ppParent;
-  amatch_avl *pBalance;
+  amatch_avl *pBalance = 0;
   /* assert( amatchAvlSearch(*ppHead, pOld->zKey)==pOld ); */
   ppParent = amatchAvlFromPtr(pOld, ppHead);
   if( pOld->pBefore==0 && pOld->pAfter==0 ){
diff --git a/ext/misc/spellfix.c b/ext/misc/spellfix.c
index 2a26e0839..a6f780584 100644
--- a/ext/misc/spellfix.c
+++ b/ext/misc/spellfix.c
@@ -356,7 +356,7 @@ static int substituteCost(char cPrev, char cFrom, char cTo){
 static int editdist1(const char *zA, const char *zB, int *pnMatch){
   int nA, nB;            /* Number of characters in zA[] and zB[] */
   int xA, xB;            /* Loop counters for zA[] and zB[] */
-  char cA, cB;           /* Current character of zA and zB */
+  char cA = 0, cB;       /* Current character of zA and zB */
   char cAprev, cBprev;   /* Previous character of zA and zB */
   char cAnext, cBnext;   /* Next character in zA and zB */
   int d;                 /* North-west cost value */
diff --git a/ext/rtree/rtree.c b/ext/rtree/rtree.c
index 57b38de03..058dc96a4 100644
--- a/ext/rtree/rtree.c
+++ b/ext/rtree/rtree.c
@@ -2806,6 +2806,8 @@ static int rtreeUpdate(
   rtreeReference(pRtree);
   assert(nData>=1);
 
+  cell.iRowid = 0;  /* Used only to suppress a compiler warning */
+
   /* Constraint handling. A write operation on an r-tree table may return
   ** SQLITE_CONSTRAINT for two reasons:
   **