Add -with-compiler to dotc

Author: nicolasstucki

dist/bin/dotc

@@ -29,6 +29,7 @@ source "$PROG_HOME/bin/common"
 
 default_java_opts="-Xmx768m -Xms768m"
 bootcp=true
+withCompiler=true
 
 CompilerMain=dotty.tools.dotc.Main
 DecompilerMain=dotty.tools.dotc.decompiler.Main
@@ -89,6 +90,7 @@ case "$1" in
    -nobootcp) unset bootcp && shift ;;
       -colors) colors=true && shift ;;
    -no-colors) unset colors && shift ;;
+  -with-compiler) jvm_cp_args="$PSEP$DOTTY_COMP" && shift ;;
 
           # break out -D and -J options and add them to JAVA_OPTS as well
           # so they reach the JVM in time to do some good. The -D options

project/Build.scala

@@ -639,20 +639,22 @@ object Build {
 
   def runCompilerMain(repl: Boolean = false) = Def.inputTaskDyn {
     val dottyLib = packageAll.value("dotty-library")
+    lazy val dottyCompiler = packageAll.value("dotty-compiler")
     val args0: List[String] = spaceDelimited("<arg>").parsed.toList
     val decompile = args0.contains("-decompile")
     val debugFromTasty = args0.contains("-Ythrough-tasty")
-    val args = args0.filter(arg => arg != "-repl" && arg != "-decompile" && arg != "-Ythrough-tasty")
+    val args = args0.filter(arg => arg != "-repl" && arg != "-decompile" &&
+        arg != "-with-compiler" && arg != "-Ythrough-tasty")
 
     val main =
       if (repl) "dotty.tools.repl.Main"
       else if (decompile) "dotty.tools.dotc.decompiler.Main"
       else if (debugFromTasty) "dotty.tools.dotc.fromtasty.Debug"
       else "dotty.tools.dotc.Main"
 
-    val extraClasspath =
-      if (decompile && !args.contains("-classpath")) dottyLib + ":."
-      else dottyLib
+    var extraClasspath = dottyLib
+    if (decompile && !args.contains("-classpath")) extraClasspath += ":."
+    if (args0.contains("-with-compiler")) extraClasspath += s":$dottyCompiler"
 
     val fullArgs = main :: insertClasspathInArgs(args, extraClasspath)