[PATCH] [libc++abi] unwinder: conditionalise availability

[Saleem Abdulrasool]

Hi kledzik,

__attribute__ (( unavailable )) is for Apple specific builds.  Create a macro
to conditionalise the usage of the macro.  This is to aid in porting the
unwinder to other platforms.

http://llvm-reviews.chandlerc.com/D1906

Files:
  include/unwind.h

Index: include/unwind.h
===================================================================
--- include/unwind.h
+++ include/unwind.h
@@ -17,6 +17,12 @@
 #include <stdint.h>
 #include <stddef.h>
 
+#if defined(__APPLE__)
+#define LIBUNWIND_AVAIL __attribute__ (( unavailable ))
+#else
+#define LIBUNWIND_AVAIL
+#endif
+
 typedef enum {
   _URC_NO_REASON = 0,
   _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
@@ -181,28 +187,28 @@
 // Mac OS X does not support text-rel and data-rel addressing so these functions
 // are unimplemented
 extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context *context)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context *context)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 
 // Mac OS X 10.4 and 10.5 had implementations of these functions in
 // libgcc_s.dylib, but they never worked.  
 /// These functions are no longer available on Mac OS X.
 extern void __register_frame_info_bases(const void *fde, void *ob, void *tb,
-                                        void *db) __attribute__((unavailable));
+                                        void *db) LIBUNWIND_AVAIL;
 extern void __register_frame_info(const void *fde, void *ob)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern void __register_frame_info_table_bases(const void *fde, void *ob,
                                               void *tb, void *db)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern void __register_frame_info_table(const void *fde, void *ob)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern void __register_frame_table(const void *fde)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern void *__deregister_frame_info(const void *fde)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 extern void *__deregister_frame_info_bases(const void *fde)
-    __attribute__((unavailable));
+    LIBUNWIND_AVAIL;
 
 #ifdef __cplusplus
 }
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