[2.x] Support debug output for macros #8140
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It's sometimes useful to get the output of the macro-generated code. This adds a mechanism to allow plugins.sbt to pass in scalacOptions, which we can later check from the macro. 1. -Xmacro-settings:sbt:Vprint prints out the code. 2. Adding -Xmacro-settings:sbt:print-tree-structure prints out the tree structure.
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It's sometimes useful to get the output of the macro-generated code. This adds a mechanism to allow plugins.sbt to pass in scalacOptions, which we can later check from the macro.