Created by: xianwen
In https://github.com/facebook/buck/pull/2469, we added @AddToRuleKey private final Flavor flavor;
in order to capture cxxPlatform.getFlavor()
in SwiftCompile
class.
However, Flavor is not a supported type for rulekey computation, and we have to use @AddToRuleKey(stringify = true)
instead for this attribute.