Xcode 14.3 Beta Unable to compile with error 'MainActor' is only available in iOS 13.0 or newer

[yishair-investing]

Checklist before submitting a bug report

• I've updated to the latest released version of the SDK
• I've searched for existing GitHub issues
• I've looked for existing answers on Stack Overflow, the Facebook Developer Community Forum and the Facebook Developers Group
• I've read the Code of Conduct
• This issue is not security related and can safely be disclosed publicly on GitHub

Xcode version

14.3 Beta

Facebook iOS SDK version

16.0.0

Dependency Manager

SPM

SDK Framework

Core

Goals

Compile the SDK and App.

Expected results

App should compile.

Actual results

App fails to compile with error message:

'MainActor' is only available in iOS 13.0 or newer

Steps to reproduce

Install SDK and try compile the app.

This could be related/duplicate #2180

[marinofelipe]

Having the same issue here 👍 , whenever compiling with Swift 5.8's toolchain

[BoOelkers]

Same as well

[kielgillard]

My team has this same issue with Xcode 14.3, too.

[jordikitto]

Also seeing this with Xcode 14.3b1 - some other packages have already updated to handle this but not this package

[andre-alves]

Bump.. can't compile my app with Xcode 14.3 Beta and these frameworks:

FBSDKCoreKit
FBSDKLoginKit
FBSDKShareKit

[ecant]

Seeing this in our app too. Just tested with Xcode 14.3 Beta 2 and the issue is still present.

[kielgillard]

Can confirm, still present for beta 2.

[marinofelipe]

If only we could contribute to patching a fix.. but since it's an XCFramework that seems to use a remote source that we don't have access to 😅 🤷‍♂️ .. or perhaps we could fork and attempt to regenerate the local binary (though unsure precisely how the Facebook team does that), so...

Anyway, let us know if there's anything we can do to contribute towards having the fix earlier than later, Facebook team :)

[freddi-kit]

This would related to know issue: https://developer.apple.com/documentation/xcode-release-notes/xcode-14_3-release-notes#Known-Issues

[freddi-kit]

The Xcode “Strict Concurrency Checking” setting is not correctly passed to the compiler. If you set it to “Minimal” (the default), the compiler will still perform “Targeted” checks. (105637789)

Workaround: Add -Xfrontend -strict-concurrency=minimal to OTHER_SWIFT_FLAGS under your project’s Build Settings, or add -Xswiftc -strict-concurrency=minimal when running swift build.

[SunZhiC]

Follow Xcode alert, click fix button, the MainActor error should disappear.

[kielgillard]

This is still an issue in Xcode 14.3 beta 3.

It didn't seem like adding those compiler flags to my project did anything (I cannot see the compiler flags passed in the SwiftEmitModule step) #2181 (comment):

SwiftEmitModule normal arm64 Emitting\ module\ for\ FacebookLogin (in target 'FacebookLogin' from project 'Facebook')
    cd /REDACTED/SourcePackages/checkouts/facebook-ios-sdk
    builtin-swiftTaskExecution -- /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /REDACTED/SourcePackages/checkouts/facebook-ios-sdk/Sources/FacebookLogin/Exports.swift -target arm64-apple-ios11.0-simulator -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.4.sdk -I /REDACTED/Build/Products/Debug-iphonesimulator -I /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/lib -F /REDACTED/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /REDACTED/Build/Products/Debug-iphonesimulator/PackageFrameworks -F /REDACTED/Build/Products/Debug-iphonesimulator -F /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks -F /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator16.4.sdk/Developer/Library/Frameworks -no-color-diagnostics -enable-testing -g -module-cache-path /Users/kgillard/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -profile-generate -profile-coverage-mapping -swift-version 5 -enforce-exclusivity\=checked -Onone -D SWIFT_PACKAGE -D DEBUG -D Xcode -serialize-debugging-options -empty-abi-descriptor -Xcc -working-directory -Xcc /REDACTED/SourcePackages/checkouts/facebook-ios-sdk -resource-dir /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -enable-anonymous-context-mangled-names -Xcc -ivfsstatcache -Xcc /Users/kgillard/Library/Developer/Xcode/DerivedData/SDKStatCaches.noindex/iphonesimulator16.4-20E5238a-.sdkstatcache -Xcc -I/REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/swift-overrides.hmap -Xcc -I/REDACTED/Build/Products/Debug-iphonesimulator/include -Xcc -I/REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/DerivedSources-normal/arm64 -Xcc -I/REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/DerivedSources/arm64 -Xcc -I/REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -module-name FacebookLogin -disable-clang-spi -target-sdk-version 16.4 -target-sdk-name iphonesimulator16.4 -emit-module-doc-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin.swiftdoc -emit-module-source-info-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin.swiftsourceinfo -emit-objc-header-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin-Swift.h -serialize-diagnostics-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin-master-emit-module.dia -emit-dependencies-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin-master-emit-module.d -parse-as-library -o /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin.swiftmodule -emit-abi-descriptor-path /REDACTED/Build/Intermediates.noindex/Facebook.build/Debug-iphonesimulator/FacebookLogin.build/Objects-normal/arm64/FacebookLogin.abi.json

Follow Xcode alert, click fix button, the MainActor error should disappear.

Which alert? Or is this what Facebook developer need to do to fix the FacebookLogin module?

[SajjadKharrazi]

Fixing with swiftlang/swift#64412.
tnx to @tshortli

[cameronehrlich]

Our team just ran into this with Xcode 14.3 RC using Xcode Cloud, hopefully @tshortli's fix makes it into the GM! 🤞

[leogiroux]

Our team just ran into this issue too, what can we do to solve it ? Our Xcode Cloud can't build testflight anymore.

[zhangjiemin000]

try download swift 5.7.2 from https://www.swift.org/download . and change the toolchain of Xcode when install is done.

[xmollv]

Our team just ran into this with Xcode 14.3 RC using Xcode Cloud, hopefully @tshortli's fix makes it into the GM! 🤞

Yeah, we have the same issue with the RC in Xcode Cloud.

[jakesquareone]

XCode Cloud just stopped working for us too, what is the fix here @samodom?

[nirb1991]

I can see that it's already fixed here, but I'm still getting the error in Xcode 14.3 RC.
Does the RC version contain the fix?

[marinofelipe]

@nirb1991, nope. The fix was cherry picked to Swift 5.8 branch 3 days ago, so that hope is that it will make the next RC🤞

[raxityo]

This issue (along with #2180) has been fixed in Xcode 14.3 RC2. The app compiles and builds successfully for me 🎉

From the Relese Notes:

Fixed: The Swift compiler may fail to build modules for XCFramework dependencies that were built with BUILD_LIBRARY_FOR_DISTRIBUTION enabled. These failures will occur when the XCFramework contains public Swift declarations that have @MainActor constraints implicitly added, such as subclasses of UIView or NSView. The Swift compiler expects those declarations to be marked @available for an operating system version where Swift concurrency is available.
(105610970)