scala - 编译Build.scala时如何设置SBT使用的scalacOptions？

Question

我在试图弄清楚如何设置/附加到 scalacOptions 时遇到了一些麻烦SBT 编译时使用 Build.scala .我团队中有人从 Akka 的 Build.scala 中复制了一些代码结果是一堆已弃用的警告和功能警告。

$ reload
[info] Loading global plugins from /Users/xxx/.sbt/0.13/plugins
[info] Loading project definition from /Users/xxx/yyy/zzz/project
[info] Compiling 1 Scala source to /Users/xxx/yyy/zzz/project/target/scala-2.10/sbt-0.13/classes...
[warn] there were 3 deprecation warning(s); re-run with -deprecation for details
[warn] there were 1 feature warning(s); re-run with -feature for details
[warn] two warnings found

我尝试过的事情

添加 scalacOptions ++= Seq("-unchecked", "-feature")至 build.sbt .我希望它会在 Build.scala 之前加载被编译。

已有 scalacOptions ++= Seq(...., "-unchecked", "-feature")在 Build.scala

尝试设置 scalacOptions之前 reload但它似乎被丢弃了

$ ;set scalacOptions ++= Seq("-feature", "-deprecated") ;reload
[info] Defining zzz/*:scalacOptions
[info] The new value will be used by zzz/compile:scalacOptions
[info] Reapplying settings...
[info] Set current project to zzz (in build file:/Users/xxx/yyy/zzz/)
[info] Loading global plugins from /Users/xxx/.sbt/0.13/plugins
[info] Loading project definition from /Users/xxx/yyy/zzz/project
[info] Compiling 1 Scala source to /Users/xxx/yyy/zzz/project/target/scala-2.10/sbt-0.13/classes...
[warn] there were 3 deprecation warning(s); re-run with -deprecation for details
[warn] there were 1 feature warning(s); re-run with -feature for details
[warn] two warnings found
[warn] Discarding 1 session setting.  Use 'session save' to persist session settings.

通过大量的汗水，我能够找到已弃用警告的原因，但我找不到功能警告的原因。

Answer 1

Sbt is recursive ，这意味着 Build.scala在 project目录由其父目录或 build.sbt 中的另一个定义构建在 project目录。

因此你必须创建 build.sbt在 project目录。在 project/build.sbt你应该可以设置 scalacOptions ++= Seq("-unchecked", "-feature") .