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From: "James Greenhalgh" <james.greenhalgh@arm.com>
To: <gcc-patches@gcc.gnu.org>
Subject: [Patch ARM] Add predefined macro when unaligned access is available.
Date: Thu, 15 Sep 2011 09:48:55 +0100
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Hi,

This patch adds a predefined macro __ARM_FEATURE_UNALIGNED
which is set when unaligned access is supported in hardware and
enabled by users.

Thanks,
James Greenhalgh

gcc/

2011-09-14  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/arm/arm.h (TARGET_CPU_CPP_BUILTINS):
	New builtin macro.

diff --git gcc/config/arm/arm.h gcc/config/arm/arm.h
index 208ee51..a76988e 100644
--- gcc/config/arm/arm.h
+++ gcc/config/arm/arm.h
@@ -47,6 +47,8 @@ extern char arm_arch_name[];
     {							\
 	if (TARGET_DSP_MULTIPLY)			\
 	   builtin_define ("__ARM_FEATURE_DSP");	\
+	if (unaligned_access)				\
+	  builtin_define ("__ARM_FEATURE_UNALIGNED");	\
 	/* Define __arm__ even when in thumb mode, for	\
 	   consistency with armcc.  */			\
 	builtin_define ("__arm__");			\