libatomic: Detect and build for ARM architecture armv8-a.

2012-12-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>

	* config/arm/arm-config.h (__ARM_ARCH_8A__): New.

From-SVN: r194150

libatomic/ChangeLog

+2012-12-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>
+
+	* config/arm/arm-config.h (__ARM_ARCH_8A__): New.
+
 2012-11-21  Matthias Klose  <doko@ubuntu.com>
 
 	* configure.tgt (i[3456]86): Handle -mx32 like -m64.

libatomic/config/arm/arm-config.h

@@ -57,6 +57,10 @@
 # define __ARM_ARCH__ 7
 #endif
 
+#if defined(__ARM_ARCH_8A__)
+# define __ARM_ARCH__ 8
+#endif
+
 #ifndef __ARM_ARCH__
 #error Unable to determine architecture.
 #endif