I'm just preparing my app for iOS 9, prior to the new release next week, using latest beta version of Xcode but it gives me this error message:
Nope, you cannot with beta versions of Xcode (same as with previous beta versions of Xcode). Now the newest Xcode version is the 7.1 beta which cannot be used for publishing apps. But there is Xcode 7.0 GM version and with this one it should be possible to publish app. Now when I am uploading apps it gives me same warning ("Invalid Toolchain..."; but I have it in testing for internal testers, I am uploading app via Application Loader) but it shouldn't take long and after few days Apple sends emails to developers that App Store now accepts iOS 9 versions of apps.
来源：https://stackoverflow.com/questions/32511858/is-it-possible-to-upload-to-app-store-using-xcode-7-1-beta