[stdlib] Don't call object_isClass(). (#11476)
object_isClass() is unavailable on Swift's oldest deployment targets.
rdar://33872748
diff --git a/stdlib/public/runtime/SwiftObject.mm b/stdlib/public/runtime/SwiftObject.mm
index 404ac1b..b8d2c82 100644
--- a/stdlib/public/runtime/SwiftObject.mm
+++ b/stdlib/public/runtime/SwiftObject.mm
@@ -79,6 +79,15 @@
#endif
}
+#if SWIFT_OBJC_INTEROP
+/// \brief Replacement for ObjC object_isClass(), which is unavailable on
+/// deployment targets macOS 10.9 and iOS 7.
+static bool objcObjectIsClass(id object) {
+ // same as object_isClass(object)
+ return class_isMetaClass(object_getClass(object));
+}
+#endif
+
/// \brief Fetch the type metadata associated with the formal dynamic
/// type of the given (possibly Objective-C) object. The formal
/// dynamic type ignores dynamic subclasses such as those introduced
@@ -105,7 +114,7 @@
id objcObject = reinterpret_cast<id>(object);
Class objcClass = [objcObject class];
- if (object_isClass(objcObject)) {
+ if (objcObjectIsClass(objcObject)) {
// Original object is a class. We want a
// metaclass but +class doesn't give that to us.
objcClass = object_getClass(objcClass);
