¿Por qué `scalaVersion in Global` no configura scalaVersion para todos los proyectos?

Despues de leer Scopes documentation, I expected 

scalaVersion in Global := "2.10.3"

in object MyProjectBuild extends Build para establecer scalaVersion for all projects. However, after reloading the project, I get

> show scalaVersion
[info] subproject1/*:scalaVersion
[info]  2.10.2
[info] subproject2/*:scalaVersion
[info]  2.10.2
[info] all/*:scalaVersion
[info]  2.10.2

Lo mismo pasa con ThisBuild en lugar de Global. scalaVersion isn't set anywhere else. What am I misunderstanding? inspect produces (both for Global y ThisBuild):

> inspect scalaVersion
[info] Setting: java.lang.String = 2.10.2
[info] Description:
[info]  The version of Scala used for building.
[info] Provided by:
[info]  */*:scalaVersion
[info] Defined at:
[info]  (sbt.Defaults) Defaults.scala:211
[info] Reverse dependencies:
[info]  all/*:ivyReport::update
[info]  all/*:dependencyUpdatesData
[info]  all/*:scalaInstance
[info]  all/*:update
[info]  all/*:allDependencies
[info]  all/*:libraryDependencies
[info] Delegates:
[info]  all/*:scalaVersion
[info]  {.}/*:scalaVersion
[info]  */*:scalaVersion
[info] Related:
[info]  */*:scalaVersion
> inspect actual scalaVersion
[info] Setting: java.lang.String = 2.10.2
[info] Description:
[info]  The version of Scala used for building.
[info] Provided by:
[info]  */*:scalaVersion
[info] Defined at:
[info]  (sbt.Defaults) Defaults.scala:211
[info] Delegates:
[info]  all/*:scalaVersion
[info]  {.}/*:scalaVersion
[info]  */*:scalaVersion
[info] Related:
[info]  */*:scalaVersion

I currently set common settings for all projects using a val commonSettings = Seq(scalaVersion := ...) y settings(commonSettings: _*) for all projects, so the question is specifically why doesn't the above approach work.

preguntado el 12 de febrero de 14 a las 05:02

Has probado inspect scalaVersion y inspect actual scalaVersion for hints on where it is getting the value from? -

@huynhjl Added the output. -

2 Respuestas

My guess is you're using the Play Framework or some other framework that adds its own keys to the build, and you're setting the scala version before adding the framework keys.

Mueva el scalaVersion definition to the bottom of the build script, you should get what you want (or, alternatively, move the playScalaSettings or whatever else above the definition)

Respondido 12 Feb 14, 08:02

No, I am not using any such framework. I was setting scalaVersion temprano en Build.scala, but moving scalaVersion to the bottom doesn't change anything. - Aleksey Romanov

The project was using SBT 0.13.0. After switching to 0.13.1 it works as expected, though I don't see anything relevant in the cambios.

Respondido 12 Feb 14, 12:02

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