What is libswiftRemoteMirror.dylib and why is it being included in my app bundle?

Question

I\'ve got an iOS app which I\'ve recently switched to Xcode 8. As part of that we switched from swift 2.2 to 2.3 (swift 3 will come later).

I\'ve got an automated build

Answer 1

Recently started using Swift for our project and got same error.

To find a root cause, I just did 'grep -Ril "libswiftRemoteMirror" .' in XCode.app (I have 10.1 currently) and found ./Contents/PlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/XCLanguageSupport.xcplugin/Contents/Resources/swift-stdlib-tool.xcspec file. It says:

     // SWIFT_RESOURCE_DESTINATION and SWIFT_RESOURCE_LIBRARY allow us to copy
    // libswiftRemoteMirror.dylib into place so that memory debugging tools have access to it
    // on device.
    // We disable these options in "DEPLOYMENT" modes, so that the libswiftRemoteMirror.dylib
    // does not make its way into archives submitted to the App Store.

So solution is simple - in XCode target settings set Deployment Postprocessing to Yes for your Release configuration (or whatever you use for build)