Question

Is there a way to test (with the preprocessor) if a file is being compiled under Xcode 4.4 or newer? Or, more particularly, to test if the compiler will automatically @synthesize properties and throw a compile error if not?

Answer 1

you can use this to test for the feature:

#if (defined(__clang__) && __has_feature(objc_default_synthesize_properties))
#warning Got it
#else
#error omg no auto synthesis
#endif

the full list of features is documented here: http://clang.llvm.org/docs/LanguageExtensions.html