带 SBT 的条件 scalacOptions [英] Conditional scalacOptions with SBT

问题描述

我正在使用 SBT 为 Scala 2.8、2.9 和(希望)2.10 交叉构建的项目.我想在仅使用 2.10 编译时添加 -feature 选项.

I am using a project with cross-build for Scala 2.8, 2.9 and (hopefully) 2.10, using SBT. I would like to add the -feature option when compiling with 2.10 only.

换句话说，当我使用小于 2.10.0 的版本进行编译时，我想将编译器选项设置为:

In other words, when I compile with a version smaller than 2.10.0, I would like to set the compiler options as:

scalacOptions ++= Seq( "-deprecation", "-unchecked" )

并且在使用大于或等于 2.10.0 的版本进行编译时:

and when compiling with a version greater or equal than 2.10.0:

scalacOptions ++= Seq( "-deprecation", "-unchecked", "-feature" )

有没有办法做到这一点?

Is there a way to achieve this ?

推荐答案

交叉构建时，scalaVersion 反映您的项目当前构建所针对的版本.所以取决于 scalaVersion 应该可以解决问题:

When cross-building, scalaVersion reflects the version your project is currently built against. So depending on scalaVersion should do the trick:

val scalaVersionRegex = "(\\d+)\\.(\\d+).*".r
...
scalacOptions <++= scalaVersion { sv =>
  sv match {
    case scalaVersionRegex(major, minor) if major.toInt > 2 || (major == "2" && minor.toInt >= 10) =>
      Seq( "-deprecation", "-unchecked", "-feature" )
    case _ => Seq( "-deprecation", "-unchecked" )
}

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