Swift-Syntax Prebuilts for Macros 6.1 #8214
Merged
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Following the pattern used for the early Traits work, added a workspace prebuilts manager to co-ordinate detecting when macros are using swift-syntax, downloading the zip file for the resolved swift-syntax version, and extracting it into the scratch directory. We add the necessary information about that to the workspace state. We then morph the Modules that use it to add build settings to find the necessary modules and libraries.
Cherry picked to 6.1 and a few fixes including ensuring we're only applying the prebuilts to macro targets.