[cfe-dev] __has_feature() for the non-fragile ABI

[David Chisnall]

Hi,

This tiny patch adds a __has_feature(objc_nonfragile_abi) when  
compiling with -fobjc-nonfragile-abi.  This lets us hide instance  
variables in headers from the compiler when compiling with the non- 
fragile ABI or even hard-error when we are not if the header does not  
define ivars and so will break with the fragile ABI.

I was wondering slightly about whether we should be able to  
automatically generate some of these.  Currently this and __has_feature 
(blocks) are the only two that are dependent on language options, but  
possibly in future we might want to add the means to automatically map  
certain options to __has_feature() definitions.

Any objections if I commit this?

David
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