Create swift-latest symlink in darwin installer

Author: shahmishal

utils/build-script-impl

@@ -2149,7 +2149,7 @@ if [[ "${INSTALLABLE_PACKAGE}" ]] ; then
         echo "-- Create Installer --"
         "${SWIFT_SOURCE_DIR}/utils/toolchain-installer" "${INSTALL_DESTDIR}/${TOOLCHAIN_PREFIX}" "${DARWIN_TOOLCHAIN_BUNDLE_IDENTIFIER}" \
         "${DARWIN_TOOLCHAIN_INSTALLER_CERT}" "${DARWIN_TOOLCHAIN_INSTALLER_PACKAGE}" "${DARWIN_TOOLCHAIN_INSTALL_LOCATION}" \
-        "${DARWIN_TOOLCHAIN_VERSION}"
+        "${DARWIN_TOOLCHAIN_VERSION}" "${SWIFT_SOURCE_DIR}/utils/darwin-installer-scripts"
       fi 
 
       (cd "${INSTALL_DESTDIR}" &&

utils/darwin-installer-scripts/postinstall

@@ -0,0 +1,16 @@
+#!/bin/bash
+#===--- postinstall - Creates symlink after installing xctoolchain ----------===#
+#
+## This source file is part of the Swift.org open source project
+##
+## Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See http://swift.org/LICENSE.txt for license information
+## See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+#
+#===------------------------------------------------------------------------===#
+
+INSTALLED_TOOLCHAIN=$2
+
+ln -fs "${INSTALLED_TOOLCHAIN}" "${INSTALLED_TOOLCHAIN%/*}/swift-latest.xctoolchain"

utils/toolchain-installer

@@ -17,6 +17,8 @@ DARWIN_INSTALLER_CERT=$3
 DARWIN_INSTALLER_PACKAGE=$4
 DARWIN_TOOLCHAIN_INSTALL_LOCATION=$5
 DARWIN_TOOLCHAIN_VERSION=$6
+DARWIN_SCRIPTS=$7
 
 pkgbuild --root "${TOOLCHAIN_PREFIX}" --install-location "${DARWIN_TOOLCHAIN_INSTALL_LOCATION}" "${DARWIN_INSTALLER_PACKAGE}" \
-         --version "${DARWIN_TOOLCHAIN_VERSION}" --identifier "${DARWIN_BUNDLE_IDENTIFIER}" --sign "${DARWIN_INSTALLER_CERT}"
+         --version "${DARWIN_TOOLCHAIN_VERSION}" --identifier "${DARWIN_BUNDLE_IDENTIFIER}" --sign "${DARWIN_INSTALLER_CERT}" \
+         --scripts "${DARWIN_SCRIPTS}"