About a year ago, I built a tool which did some XPC and, following 
documentation I read somewhere, invoked xpc_release().  This little project 
uses ARC and stills builds OK in Xcode 4.5.2.

I want to absorb it into a big old project that contains a couple dozen 
targets.  So I added a target for it, with ARC.  But building the big project 
fails because the macro OS_OBJECT_USE_OBJC_RETAIN_RELEASE is defined, and in 
xpc.h this redefines xpcrelease, which is also apparently a macro, to be a 
function which invokes -release, which is not allowed under ARC.

In the little project, OS_OBJECT_USE_OBJC_RETAIN_RELEASE is not defined.  And 
*I* have not defined it in the big project, in any of my code, but apparently 
this definition got included somewhere.

How might it have gotten defined, and should it be defined or not?  In the 
documentation of xpc_release(), there is no indication to not use it under ARC. 
 Indeed it could be defined elsewhere, to do something different.

All of the other targets in the big project do not use ARC.  Both targets are 
built with the "Latest" (10.8) SDK.

What's wrong with this picture?

Thanks,

Jerry


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