[webkit-dev] Removing BUILDING_ON / TARGETING macros in favor of system availability macros

[Mark Mentovai]

Mark Rowe wrote:

> TN2064 appears to have been last modified in 2003, so it predates the
> existence of Availability.h.
>

Well, that’s about as long as I’ve been writing SDK- and
deployment-target-aware code…

Availability.h was introduced with the iOS SDK in order to support
> availability macros that are compatible with both OS X and iOS, where the
> older macros from AvailabilityMacros.h were specific to OS X.
>

Cool. Other than double-underscore paranoia, there’s no real difference or
complaint from me.

I guess the one drawback shared by <Availability.h>,
<AvailabilityMacros.h>, and the outgoing BUILDING_ON_*/TARGETING_* macros
is that if you forget to #include the right header, the preprocessor
silently does something that you’re probably not expecting. Using a
function-like macro like USE(), OS(), and PLATFORM() would help.
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