slightly faster default compilation of Isabelle/Scala;

--- a/Admin/CHECKLIST	Mon Apr 09 20:42:05 2012 +0200
+++ b/Admin/CHECKLIST	Mon Apr 09 20:57:23 2012 +0200
@@ -34,6 +34,9 @@
     etc/components
     lib/html/library_index_content.template
 
+- test separate compilation of Isabelle/Scala PIDE sources:
+    Admin/build jars_test
+
 - test contrib components:
     x86_64-linux without 32bit C/C++ libraries
     Mac OS X Leopard

--- a/Admin/build	Mon Apr 09 20:42:05 2012 +0200
+++ b/Admin/build	Mon Apr 09 20:57:23 2012 +0200
@@ -28,6 +28,7 @@
     doc             documentation (requires latex and rail)
     doc-src         documentation sources from Isabelle theories
     jars            Isabelle/Scala layer (requires \$ISABELLE_JDK_HOME and \$SCALA_HOME)
+    jars_test       test separate build of jars
     jars_fresh      fresh build of jars
 
 EOF
@@ -121,6 +122,7 @@
     doc-src) build_doc-src;;
     jars) build_jars;;
     jars_fresh) build_jars -f;;
+    jars_test) build_jars -t;;
     *) fail "Bad module $MODULE"
   esac
 done

--- a/src/Pure/build-jars	Mon Apr 09 20:42:05 2012 +0200
+++ b/src/Pure/build-jars	Mon Apr 09 20:57:23 2012 +0200
@@ -77,6 +77,7 @@
   echo
   echo "  Options are:"
   echo "    -f           fresh build"
+  echo "    -t           test separate compilation of PIDE"
   echo
   exit 1
 }
@@ -95,13 +96,17 @@
 # options
 
 FRESH=""
+TEST_PIDE=""
 
-while getopts "f" OPT
+while getopts "ft" OPT
 do
   case "$OPT" in
     f)
       FRESH=true
       ;;
+    t)
+      TEST_PIDE=true
+      ;;
     \?)
       usage
       ;;
@@ -171,11 +176,16 @@
 
   SCALAC_OPTIONS="$ISABELLE_SCALA_BUILD_OPTIONS -d classes"
 
-  isabelle_scala scalac $SCALAC_OPTIONS "${PIDE_SOURCES[@]}" || \
-    fail "Failed to compile PIDE sources"
-
-  isabelle_scala scalac $SCALAC_OPTIONS -classpath classes "${PURE_SOURCES[@]}" || \
-    fail "Failed to compile Pure sources"
+  if [ "$TEST_PIDE" = true ]; then
+    isabelle_scala scalac $SCALAC_OPTIONS "${PIDE_SOURCES[@]}" || \
+      fail "Failed to compile PIDE sources"
+    isabelle_scala scalac $SCALAC_OPTIONS -classpath classes "${PURE_SOURCES[@]}" || \
+      fail "Failed to compile Pure sources"
+  else
+    isabelle_scala scalac $SCALAC_OPTIONS -classpath classes \
+      "${PIDE_SOURCES[@]}" "${PURE_SOURCES[@]}" || \
+      fail "Failed to compile sources"
+  fi
 
   mkdir -p "$TARGET_DIR/ext" || fail "Failed to create directory $TARGET_DIR/ext"