[cfe-dev] Detecting ARC via #if(def)?

[marc hoffman]

i'm hoping this is not NDA-covered, but with LLV/Clang itself being open source i assume it's not:

at WWDC i was told there is a functionality in clang/LLVM to check for availability of specific features in general, and for whether the current code is being compiled with ARC or not, specifically, via an #if(def) - the goal being ro write a piece of code that can compile with and w/o ARC, by #if(def)ing a handful of retain/release calls.

i was told this was well documented in the clang docs, but i've been unable to find anything regarding this - is anyone here aware of this featyre (and of the option to check for that represents ARC) and could point me into the right direction?

thanx,
marc
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