__unsafe_unretained does not prevent self retain-cycles when not under ARC

CGDWebServer/GCDWebServer.m

@@ -663,7 +663,11 @@ static void _NetServiceClientCallBack(CFNetServiceRef service, CFStreamError* er
 
 - (void)addGETHandlerForBasePath:(NSString*)basePath directoryPath:(NSString*)directoryPath indexFilename:(NSString*)indexFilename cacheAge:(NSUInteger)cacheAge allowRangeRequests:(BOOL)allowRangeRequests {
   if ([basePath hasPrefix:@"/"] && [basePath hasSuffix:@"/"]) {
+#if __has_feature(objc_arc)
     GCDWebServer* __unsafe_unretained server = self;
+#else
+    __block GCDWebServer* server = self;
+#endif
     [self addHandlerWithMatchBlock:^GCDWebServerRequest *(NSString* requestMethod, NSURL* requestURL, NSDictionary* requestHeaders, NSString* urlPath, NSDictionary* urlQuery) {
       
       if (![requestMethod isEqualToString:@"GET"]) {

GCDWebDAVServer/GCDWebDAVServer.m

@@ -561,7 +561,11 @@ static inline xmlNodePtr _XMLChildWithName(xmlNodePtr child, const xmlChar* name
 - (instancetype)initWithUploadDirectory:(NSString*)path {
   if ((self = [super init])) {
     _uploadDirectory = [[path stringByStandardizingPath] copy];
+#if __has_feature(objc_arc)
     GCDWebDAVServer* __unsafe_unretained server = self;
+#else
+    __block GCDWebDAVServer* server = self;
+#endif
     
     // 9.1 PROPFIND method
     [self addDefaultHandlerForMethod:@"PROPFIND" requestClass:[GCDWebServerDataRequest class] processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {

GCDWebUploader/GCDWebUploader.m

@@ -277,7 +277,11 @@
       return nil;
     }
     _uploadDirectory = [[path stringByStandardizingPath] copy];
+#if __has_feature(objc_arc)
     GCDWebUploader* __unsafe_unretained server = self;
+#else
+    __block GCDWebUploader* server = self;
+#endif
     
     // Resource files
     [self addGETHandlerForBasePath:@"/" directoryPath:[siteBundle resourcePath] indexFilename:nil cacheAge:3600 allowRangeRequests:NO];