naruse	2013-09-26 15:06:19 +0900 (Thu, 26 Sep 2013)

  New Revision: 43048

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=43048

  Log:
    Fix compilation on gcc 4.6
    
    if __has_feature is not defined, it can't compile

  Modified files:
    trunk/gc.c
Index: gc.c
===================================================================
--- gc.c	(revision 43047)
+++ gc.c	(revision 43048)
@@ -31,8 +31,12 @@ https://github.com/ruby/ruby/blob/trunk/gc.c#L31
 #include <sys/types.h>
 #include <assert.h>
 
-#if /* is ASAN enabled? */ defined(__has_feature) ? \
-    __has_feature(address_sanitizer) /* Clang */ : \
+#ifndef __has_feature
+# define __has_feature(x) 0
+#endif
+
+#if /* is ASAN enabled? */ \
+    __has_feature(address_sanitizer) /* Clang */ || \
     defined(__SANITIZE_ADDRESS__)  /* GCC 4.8.x */
   #define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS \
         __attribute__((no_address_safety_analysis)) \

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