diff -r e831a98b3f43 Modules/_pickle.c
--- a/Modules/_pickle.c	Sat Aug 16 01:03:39 2014 +0200
+++ b/Modules/_pickle.c	Sat Aug 16 01:09:46 2014 +0200
@@ -425,10 +425,10 @@ Pdata_grow(Pdata *self)
 
     new_allocated = (allocated >> 3) + 6;
     /* check for integer overflow */
-    if (new_allocated > PY_SSIZE_T_MAX - allocated)
+    if ((size_t)new_allocated > (size_t)PY_SSIZE_T_MAX - (size_t)allocated)
         goto nomemory;
     new_allocated += allocated;
-    if (new_allocated > (PY_SSIZE_T_MAX / sizeof(PyObject *)))
+    if ((size_t)new_allocated > ((size_t)PY_SSIZE_T_MAX / sizeof(PyObject *)))
         goto nomemory;
     data = PyMem_REALLOC(data, new_allocated * sizeof(PyObject *));
     if (data == NULL)
@@ -850,7 +850,7 @@ static int
 static void
 _write_size64(char *out, size_t value)
 {
-    int i;
+    size_t i;
 
     assert(sizeof(size_t) <= 8);
 
@@ -2118,12 +2118,13 @@ write_utf8(PicklerObject *self, char *da
     char header[9];
     Py_ssize_t len;
 
+    assert(size >= 0);
     if (size <= 0xff && self->proto >= 4) {
         header[0] = SHORT_BINUNICODE;
         header[1] = (unsigned char)(size & 0xff);
         len = 2;
     }
-    else if (size <= 0xffffffffUL) {
+    else if ((size_t)size <= 0xffffffffUL) {
         header[0] = BINUNICODE;
         header[1] = (unsigned char)(size & 0xff);
         header[2] = (unsigned char)((size >> 8) & 0xff);
@@ -4508,7 +4509,7 @@ calc_binsize(char *bytes, int nbytes)
     int i;
     size_t x = 0;
 
-    for (i = 0; i < nbytes && i < sizeof(size_t); i++) {
+    for (i = 0; i < nbytes && (size_t)i < sizeof(size_t); i++) {
         x |= (size_t) s[i] << (8 * i);
     }
 
diff -r e831a98b3f43 Modules/_sqlite/cursor.c
--- a/Modules/_sqlite/cursor.c	Sat Aug 16 01:03:39 2014 +0200
+++ b/Modules/_sqlite/cursor.c	Sat Aug 16 01:09:46 2014 +0200
@@ -46,7 +46,7 @@ static pysqlite_StatementKind detect_sta
 
     dst = buf;
     *dst = 0;
-    while (Py_ISALPHA(*src) && dst - buf < sizeof(buf) - 2) {
+    while (Py_ISALPHA(*src) && (dst - buf) < (Py_intptr_t)sizeof(buf) - 2) {
         *dst++ = Py_TOLOWER(*src++);
     }
 
diff -r e831a98b3f43 Modules/socketmodule.c
--- a/Modules/socketmodule.c	Sat Aug 16 01:03:39 2014 +0200
+++ b/Modules/socketmodule.c	Sat Aug 16 01:09:46 2014 +0200
@@ -1277,7 +1277,7 @@ idna_converter(PyObject *obj, struct may
         return 0;
     }
     return Py_CLEANUP_SUPPORTED;
-}       
+}
 
 /* Parse a socket address argument according to the socket object's
    address family.  Return 1 if the address was in the proper format,
@@ -1313,7 +1313,7 @@ getsockaddrarg(PySocketSockObject *s, Py
 #ifdef linux
         if (len > 0 && path[0] == 0) {
             /* Linux abstract namespace extension */
-            if (len > sizeof addr->sun_path) {
+            if ((size_t)len > sizeof addr->sun_path) {
                 PyErr_SetString(PyExc_OSError,
                                 "AF_UNIX path too long");
                 goto unix_out;
@@ -1323,7 +1323,7 @@ getsockaddrarg(PySocketSockObject *s, Py
 #endif /* linux */
         {
             /* regular NULL-terminated string */
-            if (len >= sizeof addr->sun_path) {
+            if ((size_t)len >= sizeof addr->sun_path) {
                 PyErr_SetString(PyExc_OSError,
                                 "AF_UNIX path too long");
                 goto unix_out;
@@ -1675,7 +1675,7 @@ getsockaddrarg(PySocketSockObject *s, Py
 
             if (len == 0) {
                 ifr.ifr_ifindex = 0;
-            } else if (len < sizeof(ifr.ifr_name)) {
+            } else if ((size_t)len < sizeof(ifr.ifr_name)) {
                 strncpy(ifr.ifr_name, PyBytes_AS_STRING(interfaceName), sizeof(ifr.ifr_name));
                 ifr.ifr_name[(sizeof(ifr.ifr_name))-1] = '\0';
                 if (ioctl(s->sock_fd, SIOCGIFINDEX, &ifr) < 0) {
@@ -4290,7 +4290,7 @@ Return the IP address (a string of the f
 /* Convenience function common to gethostbyname_ex and gethostbyaddr */
 
 static PyObject *
-gethost_common(struct hostent *h, struct sockaddr *addr, int alen, int af)
+gethost_common(struct hostent *h, struct sockaddr *addr, size_t alen, int af)
 {
     char **pch;
     PyObject *rtn_tuple = (PyObject *)NULL;