[Patch] Memory fencing fixes

[Richard Henderson]

On 02/25/2013 04:51 PM, Joseph S. Myers wrote:
> With GCC 
> 4.8 you have the __ARM_ARCH macro that can be used in such conditionals, 
> but before that you just have the __ARM_ARCH_*__ macros for each 
> architecture version.

It's probably worth having a bit at the start of ports/sysdeps/arm/sysdep.h
that creates __ARM_ARCH from __ARM_ARCH_*__ if it's not already defined.


r~