TARGET_OS_OSX was not defined. Since we (currently) do not support building SCF on iOS, it’s equivalent to TARGET_OS_MAC for Swift.

millenomi · millenomi · commit 808d7602e9e5 · 2018-10-04T13:12:41.000-07:00
diff --git a/CoreFoundation/Base.subproj/SwiftRuntime/TargetConditionals.h b/CoreFoundation/Base.subproj/SwiftRuntime/TargetConditionals.h
@@ -118,6 +118,7 @@
 
 #define TARGET_OS_WIN32        TARGET_OS_WINDOWS
 #define TARGET_OS_MAC          TARGET_OS_DARWIN
+#define TARGET_OS_OSX          TARGET_OS_DARWIN
 
 #if __x86_64__
 #define TARGET_CPU_PPC          0
