Ted Kremenek edd89bfcc7 Move definition of @availabilty platforms into Attr.def, and change AvailabilityAttr's representation of platform. ...

This hardcodes the list of platforms into unique identifiers, which
has tradeoffs to using strings.  The reality is that various
logic in the compiler needs to be present to identify a given
platform, so hardcoding this list for now is ok.  We can evaluate
in the future.

This change is motivated by some needed cleanup, supporting
App Extensions @availability, and unifying build configurations
with the platform names for @availability.

As part of this change, it introduces some slightly better
parser recovery for bad @availability attributes.

Moreover, the 'macosx' platform is renamed to 'osx'.  We will need
to handle this mapping in the Clang Importer, but this is the
right thing to do.

Swift SVN r17767

2014-05-09 07:43:38 +00:00

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