@@ -27,10 +27,16 @@
 
 @interface OFPlaceholderMutableSet: OFMutableSet
 @end
 
 @implementation OFPlaceholderMutableSet
+#ifdef __clang__
+/* We intentionally don't call into super, so silence the warning. */
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wunknown-pragmas"
+# pragma clang diagnostic ignored "-Wobjc-designated-initializers"
+#endif
 - (instancetype)init
 {
 	return (id)[[OFConcreteMutableSet alloc] init];
 }
 
@@ -71,10 +77,13 @@
 
 - (instancetype)initWithCapacity: (size_t)capacity
 {
 	return (id)[[OFConcreteMutableSet alloc] initWithCapacity: capacity];
 }
+#ifdef __clang__
+# pragma clang diagnostic pop
+#endif
 
 OF_SINGLETON_METHODS
 @end
 
 @implementation OFMutableSet
@@ -95,15 +104,34 @@
 
 + (instancetype)setWithCapacity: (size_t)capacity
 {
 	return [[[self alloc] initWithCapacity: capacity] autorelease];
 }
+
+- (instancetype)init
+{
+	return [super init];
+}
+
+#ifdef __clang__
+/* We intentionally don't call into super, so silence the warning. */
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wunknown-pragmas"
+# pragma clang diagnostic ignored "-Wobjc-designated-initializers"
+#endif
+- (instancetype)initWithObjects: (id const *)objects count: (size_t)count
+{
+	OF_INVALID_INIT_METHOD
+}
 
 - (instancetype)initWithCapacity: (size_t)capacity
 {
 	OF_INVALID_INIT_METHOD
 }
+#ifdef __clang__
+# pragma clang diagnostic pop
+#endif
 
 - (id)copy
 {
 	return [[OFSet alloc] initWithSet: self];
 }