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scalac.sbt
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scalacOptions ++= {
val vn = VersionNumber(scalaVersion.value)
def cmp[A](vn: VersionNumber, direction: Int, xs: Seq[Long], ret: Seq[A]) =
if (vn.numbers.zipWithIndex.forall({
case (n, i) => n.compare(xs.lift(i).getOrElse(n)) * direction >= 0
})) ret else Seq.empty
Seq(
"-deprecation", // Emit warning and location for usages of deprecated APIs.
"-encoding", "utf-8", // Specify character encoding used by source files.
"-feature", // Emit warning and location for usages of features that should be imported explicitly.
"-unchecked", // Enable additional warnings where generated code depends on assumptions.
"-Xfatal-warnings" // Fail the compilation if there are any warnings.
) ++ cmp(vn, -1, Seq(0, 4, 0), Seq(
"-explain-implicits" // Explain implicit search errors in more detail.
)) ++ cmp(vn, -1, Seq(0, 5, 0), Seq(
"-explain", // Explain errors in more detail.
"-explain-types" // Explain type errors in more detail.
)) ++ cmp(vn, 1, Seq(2, 10, 0), Seq(
"-explaintypes", // Explain type errors in more detail.
"-language:existentials", // Existential types (besides wildcard types) can be written and inferred
"-language:experimental.macros", // Allow macro definition (besides implementation and application)
"-language:higherKinds", // Allow higher-kinded types
"-language:implicitConversions", // Allow definition of implicit functions called views
"-Xcheckinit", // Wrap field accessors to throw an exception on uninitialized access.
"-Xfuture", // Turn on future language features.
"-Yno-adapted-args", // Do not adapt an argument list (either by inserting () or creating a tuple) to match the receiver.
"-Ywarn-dead-code", // Warn when dead code is identified.
"-Ywarn-inaccessible", // Warn about inaccessible types in method signatures.
"-Ywarn-nullary-override", // Warn when non-nullary `def f()' overrides nullary `def f'.
"-Ywarn-nullary-unit", // Warn when nullary methods return Unit.
"-Ywarn-numeric-widen", // Warn when numerics are widened.
"-Ywarn-value-discard" // Warn when non-Unit expression results are unused.
)) ++ cmp(vn, 1, Seq(2, 11, 0), Seq(
"-Ywarn-infer-any" // Warn when a type argument is inferred to be `Any`.
)) ++ cmp(vn, 1, Seq(2, 11, 2), Seq(
"-Xlint:adapted-args", // Warn if an argument list is modified to match the receiver.
"-Xlint:by-name-right-associative", // By-name parameter of right associative operator.
"-Xlint:delayedinit-select", // Selecting member of DelayedInit.
"-Xlint:doc-detached", // A Scaladoc comment appears to be detached from its element.
"-Xlint:inaccessible", // Warn about inaccessible types in method signatures.
"-Xlint:infer-any", // Warn when a type argument is inferred to be `Any`.
"-Xlint:missing-interpolator", // A string literal appears to be missing an interpolator id.
"-Xlint:nullary-override", // Warn when non-nullary `def f()' overrides nullary `def f'.
"-Xlint:nullary-unit", // Warn when nullary methods return Unit.
"-Xlint:option-implicit", // Option.apply used implicit view.
"-Xlint:package-object-classes", // Class or object defined in package object.
"-Xlint:poly-implicit-overload", // Parameterized overloaded implicit methods are not visible as view bounds.
"-Xlint:private-shadow", // A private field (or class parameter) shadows a superclass field.
"-Xlint:unsound-match" // Pattern match may not be typesafe.
)) ++ cmp(vn, 1, Seq(2, 11, 3), Seq(
"-target:jvm-1.8", // Target platform for object files.
"-Xlint:type-parameter-shadow" // A local type parameter shadows a type already in scope.
)) ++ cmp(vn, 1, Seq(2, 11, 6), Seq(
"-Xlint:stars-align" // Pattern sequence wildcard must align with sequence component.
)) ++ cmp(vn, 1, Seq(2, 11, 9), Seq(
"-Ypartial-unification" // Enable partial unification in type constructor inference
)) ++ cmp(vn, 1, Seq(2, 12, 0), Seq(
"-Xlint:constant" // Evaluation of a constant arithmetic expression results in an error.
)) ++ cmp(vn, 1, Seq(2, 12, 2), Seq(
"-Ywarn-extra-implicit", // Warn when more than one implicit parameter section is defined.
"-Ywarn-unused:patvars", // Warn if a variable bound in a pattern is unused.
"-Ywarn-unused:privates", // Warn if a private member is unused.
"-Ywarn-unused:params", // Warn if a value parameter is unused.
"-Ywarn-unused:implicits", // Warn if an implicit parameter is unused.
"-Ywarn-unused:imports", // Warn if an import selector is not referenced.
"-Ywarn-unused:locals" // Warn if a local definition is unused.
))
}
scalacOptions in (Compile, console) ~= (_.filterNot(
Set(
"-Ywarn-unused:imports",
"-Xfatal-warnings"
)))