How do I get the log output of a Scala Compiler Plugin?

Question

From the scala compiler help, I would have thought that "-Xprint:MyPhase" would do just that, but despite the fact that the plugin does it's job, and that I know it makes log output, I still don't see any output from coming from scalac when it runs. All I see are "[[syntax trees at end of MyPhase]] ..." Since logging seems to simply involve calling log("..."), I can't imagine what I would be doing wrong in the code that produces the log output. As an ugly work-around I can still do System.out.println(), but if there is a log() method, than I have to assume that it's actually meant to do something ...

Paul Butcher · Accepted Answer · 2011-10-16 23:38:18Z

4

-Ylog:<phase>

Use scalac -Y to see all the "private" options.

answered Oct 16, 2011 at 23:38

Paul Butcher

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2 Comments

Sebastien Diot Over a year ago

Thank you! I just looked at Borachio, and you seem to have found a way to generate Scala code in your compiler plugin. I had a question asking for that here: stackoverflow.com/questions/7625765/… to which Kevin Wright answered that it is not possible. Would you be so kind and tell us how it works?

Paul Butcher Over a year ago

Kevin is entirely correct - although he is working on a way to fix the problem, I believe. Borachio "solves" the problem by generating source code which is then compiled in a separate invocation of the compiler. I've hidden most of the complexity involved in this behind an sbt plugin.

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