Xcode 10.2, Swift 5, Command compileSwift failed while build the program with Release Scheme

Question

I\'m using Xcode 10.2, Swift 5.

With Debug scheme, no issue happens, but with Release scheme when I build or archive, it shows Command compileSwift failed with a non

Answer 1

So I had same issue when updating my project to Swift 5. For some reason, Cocoapods (latest version, 1.6.1) set the SWIFT_VERSION of some pods to Swift 5 even if they're released as Swift 4, 4.1, 4.2 pods. So I had to add a post install script that set the correction version of swift like so

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.name == 'CryptoSwift' || target.name == 'SwiftyBeaver'
      target.build_configurations.each do |config|
        config.build_settings['SWIFT_VERSION'] = '4.2'
      end
    end
  end
end