How to get the scan-build static analyser to understand iOS ARC'd code

Question

Hi I have installed the command line utility scan-build from http://clang-analyzer.llvm.org/scan-build.html.

When I run this on my Xcode 4.2 project which uses ARC, I get loads of potential memory leak warnings as the analyser is mistakenly thinking I have forgotten to manually release memory.

Does the latest version (checker-258) support ARC properly? The release notes say it should (http://clang-analyzer.llvm.org/release_notes.html) but this isn't the evidence I am seeing.

Thanks for any help..