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#### 6.55.2 Darwin Format Checks

Darwin targets support the `CFString` (or `__CFString__`) in the format attribute context. Declarations made with such attribution will be parsed for correct syntax and format argument types. However, parsing of the format string itself is currently undefined and will not be carried out by this version of the compiler.

Additionally, `CFStringRefs` (defined by the `CoreFoundation` headers) may also be used as format arguments. Note that the relevant headers are only likely to be available on Darwin (OSX) installations. On such installations, the XCode and system documentation provide descriptions of `CFString`, `CFStringRefs` and associated functions.