Subject: [PATCH 2002/2002] Work around no libdispatch on < 10.6

---
 lib/builtins/os_version_check.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git llvm_release_70/projects/compiler-rt/lib/builtins/os_version_check.c macports_release_70/projects/compiler-rt/lib/builtins/os_version_check.c
index 772e33333..5f9180426 100644
--- llvm_release_70/projects/compiler-rt/lib/builtins/os_version_check.c
+++ macports_release_70/projects/compiler-rt/lib/builtins/os_version_check.c
@@ -15,9 +15,12 @@
 
 #ifdef __APPLE__
 
+#include <AvailabilityMacros.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <TargetConditionals.h>
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
 #include <dispatch/dispatch.h>
+#endif
 #include <dlfcn.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -26,7 +29,15 @@
 
 /* These three variables hold the host's OS version. */
 static int32_t GlobalMajor, GlobalMinor, GlobalSubminor;
-static dispatch_once_t DispatchOnceCounter;
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
+ static dispatch_once_t DispatchOnceCounter;
+#endif
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 1060
+/* declare a missing reference not found in SDK < 10.6 for function called below */
+typedef struct __CFError * CFErrorRef;
+extern CFPropertyListRef CFPropertyListCreateWithData(CFAllocatorRef, CFDataRef, CFOptionFlags, CFPropertyListFormat *, CFErrorRef *);
+#endif
 
 typedef CFDataRef (*CFDataCreateWithBytesNoCopyFuncTy)(CFAllocatorRef,
                                                        const UInt8 *, CFIndex,
@@ -180,7 +191,13 @@ Fail:
 
 int32_t __isOSVersionAtLeast(int32_t Major, int32_t Minor, int32_t Subminor) {
   /* Populate the global version variables, if they haven't already. */
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
   dispatch_once_f(&DispatchOnceCounter, NULL, parseSystemVersionPList);
+#else
+  /* expensive procedure, only do once. GlobalMajor will not be 0 once run. */
+  if (GlobalMajor == 0)
+    parseSystemVersionPList(NULL);
+#endif
 
   if (Major < GlobalMajor)
     return 1;
-- 
2.20.1 (Apple Git-116)