GNUstep CoreBase and ARC

[陈北宗]

I was trying to compile some existing OS X code, in which made heavy use of 
Toll-Free bridging between CoreFoundation and Foundation and is written using 
ARC. It doesn’t compile on GNUstep at all.

The culprit is that the toll-free bridging code typedef’d Foundation types to 
CF types. This is not allowed in ARC.

Is there any workaround possible? Or should we consider rewriting CoreBase into 
some more Apple like fashion?

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