Failure to increment extern variable

[frgomes]

https://github.com/frgomes/scala-native-testsuite/blob/master/testsuite/0202/src/main/scala/issue0202.scala

package scala.scalanative
package native


@extern
object getopt {
  var optarg: CString = extern
  var optind: CInt    = extern
  var opterr: CInt    = extern
  var optopt: CInt    = extern

  def getopt(argc: CInt, argv: Ptr[CString], optstring: CString): CInt = extern

  def getopt_long     (argc: CInt, argv: Ptr[CString], optstring: CString, longopts: Ptr[option], longindex: Ptr[CInt]): CInt = extern
  def getopt_long_only(argc: CInt, argv: Ptr[CString], optstring: CString, longopts: Ptr[option], longindex: Ptr[CInt]): CInt = extern

  @struct
  class option(val name:    CString,
               val has_arg: CInt,
               val flag:    Ptr[CInt],
               val `val`:   CInt)
}

object Main {
  def main(args: Array[String]): Unit = {
    import scala.scalanative.native.getopt._
    optind = optind + 1
  }
}

[densh]

Thanks for the report!