[PATCH] compiler-rt darwin macros

[David Fang]

Hi,

I thought I'd share a little patch I needed for the latest compiler-rt to 
build on powerpc-darwin8, that might be needed on other darwin platforms.

The first part of the patch adds a missing NOT_HERE_IN_10_8_AND_EARLIER 
macro for the __ppc__ case.

The second part provides an empty macro for __DARWIN_ALIAS_C on older 
systems that didn't define it in <sys/cdefs.h>.

Any interest in either piece?  (I can commit after approval.)

Fang

-- 
David Fang
http://www.csl.cornell.edu/~fang/
-------------- next part --------------
commit 5ae01c4baaaeec09be73548f6e2435833c28f384
Author: David Fang <fang at csl.cornell.edu>
Date:   Thu May 23 22:05:29 2013 -0700

    for darwin8: provide empty __DARWIN_ALIAS_C macro

diff --git a/lib/apple_versioning.c b/lib/apple_versioning.c
index 09f149f..c5d9a5c 100644
--- a/lib/apple_versioning.c
+++ b/lib/apple_versioning.c
@@ -22,6 +22,7 @@
             __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
         extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
             __attribute__((visibility("default"))) const char sym##_tmp5 = 0; 
+    #define NOT_HERE_IN_10_8_AND_EARLIER(sym) 
   #else
     #define NOT_HERE_BEFORE_10_6(sym) \
          extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
diff --git a/lib/interception/interception.h b/lib/interception/interception.h
index d50af35..3debb08 100644
--- a/lib/interception/interception.h
+++ b/lib/interception/interception.h
@@ -89,6 +89,15 @@ typedef __sanitizer::OFF64_T OFF64_T;
 #if defined(__APPLE__)
 #include <sys/cdefs.h>  // For __DARWIN_ALIAS_C().
 
+// on darwin8 (OS X 10.4), no library symbols were version-suffixed with "$UNIX2003"
+// compare <sys/cdefs.h> across Darwin versions for reference
+#ifndef	__DARWIN_ALIAS
+#define	__DARWIN_ALIAS(sym)
+#endif
+#ifndef	__DARWIN_ALIAS_C
+#define	__DARWIN_ALIAS_C(sym)
+#endif
+
 // Just a pair of pointers.
 struct interpose_substitution {
   const uptr replacement;