Use SwiftPM to build iOS target

[Mordil (Nathan Harris)]

@allevato

It's quite different, because swift build only builds standalone command-line executables for macOS. iOS (as well as macOS, for non-command-line apps) requires handling assets/resources (invoking tools like actool and ibtool ), compiling localized strings files, configuring Info.plist files, and then copying them into the appropriate .app bundle structure, in addition to signing that you already metioned. Then, if they wanted to support other targets than just basic iOS apps (like app extensions, or framework bundles), then they'd have to handle the differences between those kinds of bundles as well.

I'd imagine all that would be possible should this SPM proposal advance further: Extensible Build Tools