Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

compiler/scripts/darta.sh

Index: compiler/scripts/darta.sh
diff --git a/compiler/scripts/dartc.sh b/compiler/scripts/darta.sh
similarity index 60%
rename from compiler/scripts/dartc.sh
rename to compiler/scripts/darta.sh
index ce5458e5daa1b4e615620cc15dc2274067cb3ab7..fde033e62ed187a1ddd8680011151c7452c06edd 100755
--- a/compiler/scripts/dartc.sh
+++ b/compiler/scripts/darta.sh
@@ -6,8 +6,15 @@
 set -e
 
 SCRIPT_DIR=$(dirname $0)
-DARTC_HOME=$(dirname $SCRIPT_DIR)
-DARTC_LIBS=$DARTC_HOME/lib
+DARTA_HOME=${SCRIPT_DIR}
+# Assuming running from dart-sdk/analysis
+DART_LIBDIR=${SCRIPT_DIR}/..
+
+# Make sure the libdir looks right. 
+if [ ! -f ${DART_LIBDIR}/core/lib/core/core_runtime.dart -a -d ${DART_LIBDIR}/dart-sdk ] ; then
+  # for running from out/<arch>/analysis
+  DART_LIBDIR=${DART_LIBDIR}/dart-sdk
+fi
 
 if [ -x /usr/libexec/java_home ]; then
   export JAVA_HOME=$(/usr/libexec/java_home -v '1.6+')
@@ -23,5 +30,8 @@ if [ "$OS" == "darwin" ] ; then
   EXTRA_JVMARGS+="-Xmx256M -client -d32"
 fi
 
-exec java $EXTRA_JVMARGS $DART_JVMARGS -ea -classpath "@CLASSPATH@" \
-  com.google.dart.compiler.DartCompiler $@
+
+CLASSPATH="@CLASSPATH@"
+exec java $EXTRA_JVMARGS $DART_JVMARGS -ea -classpath $CLASSPATH \
+  com.google.dart.compiler.DartCompiler --dart-sdk ${DART_LIBDIR} $@
+