In order to be effective, a feature test macro must be defined before including any header files. This can be done either in the compilation command (cc -DMACRO=value) or by defining the macro within the source code before including any headers.
This macro controls the API version exposed by Waffle's headers. The value ((major << 8) | minor) exposes the API of Waffle major.minor. For example, the value 0x0103 exposes the API of Waffle 1.3. If this macro is undefined, then the headers expose the API of Waffle 1.2.
This macro exposes experimental features in Waffle's headers. Experimental features may be altered or removed without notice and do not belong to Waffle's stable API.
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