Add option -port to fsc

Option "port" limits compile server lookup and start to given port.
Normally fsc will start a compile server in a random port if no server
is yet running. This can be problematic with firewalls and/or remote
compile servers. Option "port" should not be confused with option
"server" which looks for a compile server in given host and port and
fails if such server is not found.

Automatic tests for command line user interface do not exist at all.
Thus, adding a test for one new option would require designing a whole
new testing method.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/util/SocketServer.scala b/src/compiler/scala/tools/util/SocketServer.scala
index 1d39a59cf4..7858bf0658 100644
--- a/src/compiler/scala/tools/util/SocketServer.scala
+++ b/src/compiler/scala/tools/util/SocketServer.scala
@@ -28,12 +28,12 @@ trait CompileOutputCommon {
  *  @author  Martin Odersky
  *  @version 1.0
  */
-abstract class SocketServer extends CompileOutputCommon {
+abstract class SocketServer(fixPort: Int = 0) extends CompileOutputCommon {
   def shutdown: Boolean
   def session(): Unit
   def timeout(): Unit = ()  // called after a timeout is detected for subclasses to cleanup
   // a hook for subclasses
-  protected def createServerSocket(): ServerSocket = new ServerSocket(0)
+  protected def createServerSocket(): ServerSocket = new ServerSocket(fixPort)
 
   var in: BufferedReader = _
   var out: PrintWriter   = _