message: Use default Xcode version
diff: @@ -384,7 +384,7 @@ def doBuildMacOs(String buildType) {
  getArchive()
  dir("build-macos-${buildType}") {
  - withEnv(['DEVELOPER_DIR=/Applications/Xcode-8.2.app/Contents/Developer/']) {
  + withEnv(['DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer/']) {
  // This is a dirty trick to work around a bug in xcode
  // It will hang if launched on the same project (cmake trying the compiler out)
  // in parallel.
  @@ -423,7 +423,7 @@ def doBuildAppleDevice(String sdk, String buildType) {
  node('macos || osx') {
  getArchive()
  - withEnv(['DEVELOPER_DIR=/Applications/Xcode-8.2.app/Contents/Developer/']) {
  + withEnv(['DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer/']) {
  retry(3) {
  timeout(time: 15, unit: 'MINUTES') {
  runAndCollectWarnings(parser:'clang', script: """
  