With both sbt-buildinfo and scrooge-sbt-plugin enabled, buildinfo fails

[rtyley]

We're using the scrooge-sbt-plugin to generate Scala classes from Thrift definitions, and it looks like that plugin and sbt-buildinfo have a bad interaction. With either of them disabled, things work, but with both enabled, a "X is already defined as case class X" error occurs (even if I change the name from the default 'BuildInfo').

Should be easily reproducible from this commit:

guardian/friendly-tailor@aa85aad

> compile
[info] Compiling 6 Scala sources to /home/rtyley/development/friendly-tailor/target/scala-2.11/classes...
[error] /home/rtyley/development/friendly-tailor/target/scala-2.11/src_managed/main/sbt-buildinfo/Info.scala:6: Info is already defined as case class Info
[error] case object Info {
[error]             ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 2 s, completed 29-Apr-2016 13:45:48

[rtyley]

cc @travisbrown & @benjumanji, who've both worked on the scrooge-sbt-plugin.

[philwills]

I'm pretty certain this is a Scrooge, rather than an sbt-buildinfo issue, so have opened an issue there.

[eed3si9n]

I am guessing we are hitting this: sbt/sbt#1664 aka sbt/sbt-xjc#15.

[benjumanji]

As a "workaround that you can try at home" you can tweak scroogeThriftOutputFolder to be a subdir of sourceManaged rather than the whole folder. I am without internet at home and my current place of work doesn't use finagle / scrooge so I don't have a working setup that I could use to confirm that this works.