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Fix #2369: Should warn when ignoring command line flags #2590

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Merged
merged 3 commits into from
Jun 2, 2017
Merged

Fix #2369: Should warn when ignoring command line flags #2590

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e32eb2d
Fix #2369: Should warn when ignoring command line flags
May 29, 2017
42002df
Change fail to warn
May 31, 2017
08f1233
Properly emit warning
May 31, 2017
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12 changes: 10 additions & 2 deletions compiler/src/dotty/tools/dotc/config/Settings.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,8 @@ object Settings {
depends: List[(Setting[_], Any)] = Nil,
propertyClass: Option[Class[_]] = None)(private[Settings] val idx: Int) {

private var changed: Boolean = false

def withAbbreviation(abbrv: String): Setting[T] =
copy(aliases = aliases :+ abbrv)(idx)

Expand Down Expand Up @@ -111,8 +113,14 @@ object Settings {

def tryToSet(state: ArgsSummary): ArgsSummary = {
val ArgsSummary(sstate, arg :: args, errors, warnings) = state
def update(value: Any, args: List[String]) =
ArgsSummary(updateIn(sstate, value), args, errors, warnings)
def update(value: Any, args: List[String]) = {
if (changed) {
fail(s"Flag $name set repeatedly", args)
} else {
changed = true
ArgsSummary(updateIn(sstate, value), args, errors, warnings)
}
}
def fail(msg: String, args: List[String]) =
ArgsSummary(sstate, args, errors :+ msg, warnings)
def missingArg =
Expand Down