fix more warnings

src/examples/digest_auth_example.c

@@ -46,6 +46,7 @@ ahc_echo (void *cls,
   char *username;
   const char *password = "testpass";
   const char *realm = "test@example.com";
+  int res;
   enum MHD_Result ret;
   (void) cls;               /* Unused. Silent compiler warning. */
   (void) url;               /* Unused. Silent compiler warning. */
@@ -68,13 +69,13 @@ ahc_echo (void *cls,
     MHD_destroy_response (response);
     return ret;
   }
-  ret = MHD_digest_auth_check (connection, realm,
+  res = MHD_digest_auth_check (connection, realm,
                                username,
                                password,
                                300);
   MHD_free (username);
-  if ( (ret == MHD_INVALID_NONCE) ||
-       (ret == MHD_NO) )
+  if ( (res == MHD_INVALID_NONCE) ||
+       (res == MHD_NO) )
   {
     response = MHD_create_response_from_buffer (strlen (DENIED),
                                                 DENIED,
@@ -84,7 +85,7 @@ ahc_echo (void *cls,
     ret = MHD_queue_auth_fail_response (connection, realm,
                                         MY_OPAQUE_STR,
                                         response,
-                                        (ret == MHD_INVALID_NONCE) ? MHD_YES :
+                                        (res == MHD_INVALID_NONCE) ? MHD_YES :
                                         MHD_NO);
     MHD_destroy_response (response);
     return ret;

src/microhttpd/mhd_send.c

@@ -357,7 +357,7 @@ MHD_send_on_connection_ (struct MHD_Connection *connection,
     else if (buffer_size > (size_t) ret)
       connection->epoll_state &= ~MHD_EPOLL_STATE_WRITE_READY;
 #endif /* EPOLL_SUPPORT */
-    if (ret == buffer_size)
+    if (buffer_size == (size_t) ret)
       post_cork_setsockopt (connection, want_cork);
   }
 
@@ -398,7 +398,7 @@ MHD_send_on_connection2_ (struct MHD_Connection *connection,
                                    header,
                                    header_size,
                                    MHD_SSO_HDR_CORK);
-    if ( (ret == header_size) &&
+    if ( (header_size == (size_t) ret) &&
          (0 == buffer_size) &&
          connection->sk_cork_on)
     {
@@ -443,7 +443,7 @@ MHD_send_on_connection2_ (struct MHD_Connection *connection,
 
   /* Only if we succeeded sending the full buffer, we need to make sure that
      the OS flushes at the end */
-  if (ret == header_size + buffer_size)
+  if (header_size + buffer_size == (size_t) ret)
     post_cork_setsockopt (connection, false);
 
   return ret;
@@ -665,7 +665,7 @@ MHD_send_sendfile_ (struct MHD_Connection *connection)
 
   /* Make sure we send the data without delay ONLY if we
      provided the complete response (not on partial write) */
-  if (ret == left)
+  if (left == (uint64_t) ret)
     post_cork_setsockopt (connection, false);
 
   return ret;

src/microhttpd/postprocessor.c

@@ -391,7 +391,7 @@ process_value (struct MHD_PostProcessor *pp,
   pp->xbuf_pos = 0;
   if (NULL != last_escape)
   {
-    if (value_end - last_escape < sizeof (pp->xbuf))
+    if (((size_t) (value_end - last_escape)) < sizeof (pp->xbuf))
     {
       pp->xbuf_pos = value_end - last_escape;
       memcpy (pp->xbuf,