Merge pull request swiftlang#23178 from compnerd/the-mirror-is-broken

Author: swift-ci

include/swift/SwiftRemoteMirror/SwiftRemoteMirror.h

@@ -37,6 +37,7 @@
 extern "C" {
 #endif
 
+SWIFT_REMOTE_MIRROR_LINKAGE
 extern unsigned long long swift_reflection_classIsSwiftMask;
 
 /// Get the metadata version supported by the Remote Mirror library.

stdlib/public/SwiftRemoteMirror/SwiftRemoteMirror.cpp

@@ -10,8 +10,13 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "swift/SwiftRemoteMirror/Platform.h"
+
 #define SWIFT_CLASS_IS_SWIFT_MASK swift_reflection_classIsSwiftMask
-extern "C" unsigned long long swift_reflection_classIsSwiftMask = 2;
+extern "C" {
+SWIFT_REMOTE_MIRROR_LINKAGE
+unsigned long long swift_reflection_classIsSwiftMask = 2;
+}
 
 #include "swift/Reflection/ReflectionContext.h"
 #include "swift/Reflection/TypeLowering.h"