diff --git a/SWIG/Source/DOH/Doh/base.c b/SWIG/Source/DOH/Doh/base.c
index 2b0969c78..bb844252d 100644
--- a/SWIG/Source/DOH/Doh/base.c
+++ b/SWIG/Source/DOH/Doh/base.c
@@ -65,6 +65,7 @@ DohCopy(const DOH *obj) {
   objinfo = dohtypes[b->type];
   if (objinfo->doh_copy) 
     return (objinfo->doh_copy)(b);
+  return 0;
 }
 
 void
@@ -712,7 +713,7 @@ DOH *
 DohGetfile(DOH *ho) {
   DohBase *h = (DohBase *) ho;
   DohObjInfo *objinfo;
-  if (!h) return;
+  if (!h) return 0;
   objinfo = dohtypes[h->type];
   if (objinfo->doh_getfile) 
     return (objinfo->doh_getfile)(h);
@@ -739,7 +740,7 @@ int
 DohGetline(DOH *ho) {
   DohBase *h = (DohBase *) ho;
   DohObjInfo *objinfo;
-  if (!h) return;
+  if (!h) return 0;
   objinfo = dohtypes[h->type];
   if (objinfo->doh_getline) 
     return (objinfo->doh_getline)(h);
diff --git a/SWIG/Source/DOH/Doh/memory.c b/SWIG/Source/DOH/Doh/memory.c
index 2446bca1a..56b522b06 100644
--- a/SWIG/Source/DOH/Doh/memory.c
+++ b/SWIG/Source/DOH/Doh/memory.c
@@ -57,7 +57,6 @@ CreatePool() {
 
 static void 
 InitPools() {
-  int i;
   if (pools_initialized) return;
   CreatePool();                       /* Create initial pool */
   pools_initialized = 1;
@@ -76,7 +75,6 @@ DohCheck(const DOH *ptr) {
   Pool *p = Pools;
   register char *cptr = (char *) ptr;
   register char *pptr;
-  int  d;
   while (p) {
     pptr = (char *) p->ptr;
     if ((cptr >= pptr) && (cptr < (pptr + p->blen))) return 1;
diff --git a/SWIG/Source/DOH/Doh/string.c b/SWIG/Source/DOH/Doh/string.c
index 16eea6f27..8205fdb00 100644
--- a/SWIG/Source/DOH/Doh/string.c
+++ b/SWIG/Source/DOH/Doh/string.c
@@ -496,6 +496,7 @@ static char *match_identifier(char *base, char *s, char *token, int tokenlen) {
     }
     return s;
   }
+  return 0;
 }
 
 static
@@ -507,7 +508,7 @@ int replace_simple(String *str, char *token, char *rep, int flags, int count, ch
   int ic;
   int rcount = 0;
   int noquote = 0;
-  char *c, *s, *t, *end, *first;
+  char *c, *s, *t, *first;
   char *q, *q2;
   register char *base;
   int i;
diff --git a/SWIG/Source/Preprocessor/cpp.c b/SWIG/Source/Preprocessor/cpp.c
index aa7a917d9..cae6ec835 100644
--- a/SWIG/Source/Preprocessor/cpp.c
+++ b/SWIG/Source/Preprocessor/cpp.c
@@ -767,10 +767,8 @@ Preprocessor_parse(DOH *s)
   int    start_level = 0;
   int    cpp_lines = 0;
   int    cond_lines[256];
-  int    scp;
 
   ns = NewString("");        /* Return result */
-  /* scp = NewScope(); */
 
   decl = NewString("");
   id = NewString("");