When I run the plugin I get the following error:

Details: Unable to get message category info for tool '/Applications/checker-258/libexec/ccc-analyzer'.
Reason: i686-apple-darwin11-llvm-gcc-4.2: no input files

Object: <XCCompilerSpecificationClang: 0x400e65a60>
Method: -messageCategoryInfoForExecutablePath:
Thread: <NSThread: 0x400f88b00>

Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.
cc1obj: error: unrecognized command line option "-Wno-sign-conversion"
cc1obj: error: unrecognized command line option "-fdiagnostics-print-source-range-info"
cc1obj: error: unrecognized command line option "-fdiagnostics-show-category=id"
cc1obj: error: unrecognized command line option "-fdiagnostics-parseable-fixits"
cc1obj: error: unrecognized command line option "-fobjc-arc"
Command /Applications/checker-258/libexec/ccc-analyzer failed with exit code 1

This can be fixed by a work around described here but this is not ideal:

http://stackoverflow.com/questions/7820011/clang-scan-build-wont-work-with-xcode-4-2-llvm-3-0-build-configuration