Fix warnings with GCC. Patch by TOM, tweaked to not introduce errors with clang.

blocks_runtime.m

@@ -132,7 +132,7 @@ void _Block_object_assign(void *destAddr, const void *object, const int flags)
 		}
 		else if((flags & BLOCK_FIELD_IS_OBJECT) == BLOCK_FIELD_IS_OBJECT)
 		{
-			id src = object;
+			id src = (id)object;
 			id *dst = destAddr;
 			*dst = [src retain];
 		}
@@ -174,7 +174,7 @@ void _Block_object_dispose(const void *object, const int flags)
 		}
 		else if((flags & ~BLOCK_BYREF_CALLER) == BLOCK_FIELD_IS_OBJECT)
 		{
-			id src = object;
+			id src = (id)object;
 			[src release];
 		}
 	}

encoding2.c

@@ -458,8 +458,9 @@ static const char *layout_structure_callback(const char *type, struct objc_struc
 	}
 	else
 	{
-		round_up((size_t*)&layout->record_size, align);
-		layout->record_size += size;
+        size_t rsize = (size_t)layout->record_size;
+		round_up(&rsize, align);
+        layout->record_size = rsize + size;
 	}
 	return end;
 }

sync.m

@@ -4,6 +4,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#ifdef __clang__
+#define SELECTOR(x) @selector(x)
+#else
+#define SELECTOR(x) (SEL)@selector(x)
+#endif
+
 int snprintf(char *restrict s, size_t n, const char *restrict format, ...);
 
 @interface Fake
@@ -25,7 +31,7 @@ static void deallocLockClass(id obj, SEL _cmd);
 static inline Class findLockClass(id obj)
 {
 	struct objc_object object = { obj->isa };
-	SEL dealloc = @selector(dealloc);
+	SEL dealloc = SELECTOR(dealloc);
 	// Find the first class where this lookup is correct
 	if (objc_msg_lookup((id)&object, dealloc) != (IMP)deallocLockClass)
 	{
@@ -62,8 +68,8 @@ static inline Class initLockObject(id obj)
 	}
 	const char *types =
 		method_getTypeEncoding(class_getInstanceMethod(obj->isa,
-					@selector(dealloc)));
-	class_addMethod(lockClass, @selector(dealloc), (IMP)deallocLockClass,
+					SELECTOR(dealloc)));
+	class_addMethod(lockClass, SELECTOR(dealloc), (IMP)deallocLockClass,
 			types);
 	if (!class_isMetaClass(obj->isa))
 	{
@@ -83,7 +89,7 @@ static void deallocLockClass(id obj, SEL _cmd)
 	Class realClass = class_getSuperclass(lockClass);
 	// Call the real -dealloc method
 	struct objc_super super = {obj, realClass };
-	objc_msgSendSuper(&super, @selector(dealloc));
+	objc_msgSendSuper(&super, SELECTOR(dealloc));
 	// After calling [super dealloc], the object will no longer exist.
 	// Free the lock
 	mutex_t *lock = object_getIndexedIvars(lockClass);