Facebook SDK fails the build on xcode versions prior to Xcode 16

[tejassharma96]

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

15.4

Facebook iOS SDK version

7.3.0

Dependency Manager

SPM

SDK Framework

Login

Goals

Attempted to build a project dependent on the facebook login SDK in Xcode 15.4

Expected results

A successful build. Breaking changes should be made with a major version bump, not a minor bump.

Actual results

Received the following errors during compilation:

❌ <derived data path>/Build/Products/Debug-iphonesimulator/FBSDKLoginKit.framework/Modules/FBSDKLoginKit.swiftmodule/arm64-apple-ios-simulator.private.swiftinterface:384:62: no type named 'BitwiseCopyable' in module 'Swift'
extension FBSDKLoginKit.FBTooltipView.ArrowDirection : Swift.BitwiseCopyable {}
                                                             ^
❌ <derived data path>/Build/Products/Debug-iphonesimulator/FBSDKLoginKit.framework/Modules/FBSDKLoginKit.swiftmodule/arm64-apple-ios-simulator.private.swiftinterface:389:58: no type named 'BitwiseCopyable' in module 'Swift'
extension FBSDKLoginKit.FBTooltipView.ColorStyle : Swift.BitwiseCopyable {}
                                                         ^
❌ <derived data path>/SourcePackages/checkouts/facebook-ios-sdk/Sources/FacebookLogin/Exports.swift:10:19: failed to build module 'FBSDKLoginKit'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0 effective-5.10 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)', while this compiler is 'Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)'). Please select a toolchain which matches the SDK.
@_exported import FBSDKLoginKit
                  ^
❌ <derived data path>/Build/Products/Debug-iphonesimulator/FBSDKLoginKit.framework/Modules/FBSDKLoginKit.swiftmodule/arm64-apple-ios-simulator.private.swiftinterface:384:62: no type named 'BitwiseCopyable' in module 'Swift'
extension FBSDKLoginKit.FBTooltipView.ArrowDirection : Swift.BitwiseCopyable {}
                                                             ^
❌ <derived data path>/Build/Products/Debug-iphonesimulator/FBSDKLoginKit.framework/Modules/FBSDKLoginKit.swiftmodule/arm64-apple-ios-simulator.private.swiftinterface:389:58: no type named 'BitwiseCopyable' in module 'Swift'
extension FBSDKLoginKit.FBTooltipView.ColorStyle : Swift.BitwiseCopyable {}
                                                         ^
** BUILD FAILED **
The following build commands failed:
	SwiftEmitModule normal arm64 Emitting\ module\ for\ FacebookLogin (in target 'FacebookLogin' from project 'Facebook')

Steps to reproduce

Build a project dependent on FBSDKLoginKit using Xcode 15.4

Code samples & details

Created a test repo here with a basic project with a dependency on facebook login. Open the project and attempt to build using Xcode 15.4

[sagar-singh07]

@tejassharma96 Have you found a solution, or is downgrading the only option?

[tejassharma96]

we had to just pin a lower version...

[AndreyPoznyak]

still relevant for current FBSDKLoginKit (17.4.0)