swift-nio: Can't build SwiftNIOPosix in Release (using Pods as a packet manager)

Expected behavior

I expect I can build in release mode my app that uses SwiftNIO pod. This is my pod (https://github.com/madmag77/STUNClient/blob/master/StunClient.podspec) that uses SwiftNIO as a dependency.

Actual behavior

This is a sample app (https://github.com/madmag77/STUNClient/tree/master/iOSExampleWithPods) that can’t be built in release mode when uses SwiftNIO pod version 2.38.

Output:

Ld /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/Binary/NIOPosix normal arm64 (in target 'SwiftNIOPosix' from project 'Pods')
    cd /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/Pods
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -target arm64-apple-ios10.0 -dynamiclib -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.4.sdk -L/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/SwiftNIOPosix -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.4.sdk/usr/lib/swift -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/SwiftNIOPosix -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/CNIOAtomics -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/CNIODarwin -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/CNIOLinux -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/CNIOWindows -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/SwiftNIOConcurrencyHelpers -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/SwiftNIOCore -F/Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Products/Release-iphoneos/_NIODataStructures -filelist /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/NIOPosix.LinkFileList -install_name @rpath/NIOPosix.framework/NIOPosix -Xlinker -rpath -Xlinker /usr/lib/swift -Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -rpath -Xlinker @loader_path/Frameworks -dead_strip -Xlinker -object_path_lto -Xlinker /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/NIOPosix_lto.o -fembed-bitcode-marker -fobjc-arc -fobjc-link-runtime -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos -L/usr/lib/swift -Xlinker -add_ast_path -Xlinker /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/NIOPosix.swiftmodule -framework CNIODarwin -framework CNIOLinux -framework CNIOWindows -framework NIOConcurrencyHelpers -framework NIOCore -framework _NIODataStructures -framework Foundation -compatibility_version 1 -current_version 1 -Xlinker -dependency_info -Xlinker /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/NIOPosix_dependency_info.dat -o /Users/artemgoncharov/Downloads/STUNClient/iOSExampleWithPods/DerivedData/STUNClient/Build/Intermediates.noindex/Pods.build/Release-iphoneos/SwiftNIOPosix.build/Objects-normal/arm64/Binary/NIOPosix

Undefined symbols for architecture arm64:
  "_catmc_nio_atomic__Bool_compare_and_exchange", referenced from:
      NIOPosix.PendingDatagramWritesManager.add(envelope: NIOCore.AddressedEnvelope<NIOCore.ByteBuffer>, promise: NIOCore.EventLoopPromise<()>?) -> Swift.Bool in PendingDatagramWritesManager.o
      NIOPosix.PendingStreamWritesManager.add(data: NIOCore.IOData, promise: NIOCore.EventLoopPromise<()>?) -> Swift.Bool in PendingWritesManager.o
  "_catmc_nio_atomic_long_add", referenced from:
      NIOPosix.MultiThreadedEventLoopGroup.next() -> NIOCore.EventLoop in MultiThreadedEventLoopGroup.o
      function signature specialization <Arg[0] = Owned To Guaranteed, Arg[1] = Owned To Guaranteed> of NIOPosix.MultiThreadedEventLoopGroup.init(threadInitializers: [(NIOPosix.NIOThread) -> ()], selectorFactory: () throws -> NIOPosix.Selector<NIOPosix.NIORegistration>) -> NIOPosix.MultiThreadedEventLoopGroup in MultiThreadedEventLoopGroup.o
  "_catmc_nio_atomic_long_create_with_existing_storage", referenced from:
      variable initialization expression of NIOPosix.MultiThreadedEventLoopGroup.(index in _C2B1528F4FBA68A3DBFA89DBAEBE9D4D) : NIOConcurrencyHelpers.NIOAtomic<Swift.Int> in BaseSocket.o
      one-time initialization function for (nextEventLoopGroupID in _C2B1528F4FBA68A3DBFA89DBAEBE9D4D) in MultiThreadedEventLoopGroup.o
      function signature specialization <Arg[0] = Owned To Guaranteed, Arg[1] = Owned To Guaranteed> of NIOPosix.MultiThreadedEventLoopGroup.init(threadInitializers: [(NIOPosix.NIOThread) -> ()], selectorFactory: () throws -> NIOPosix.Selector<NIOPosix.NIORegistration>) -> NIOPosix.MultiThreadedEventLoopGroup in MultiThreadedEventLoopGroup.o
  "_catmc_nio_atomic__Bool_store", referenced from:
      NIOPosix.BaseSocketChannel.close0(error: Swift.Error, mode: NIOCore.CloseMode, promise: NIOCore.EventLoopPromise<()>?) -> () in BaseSocketChannel.o
      NIOPosix.BaseSocketChannel.becomeActive0(promise: NIOCore.EventLoopPromise<()>?) -> () in BaseSocketChannel.o
      NIOPosix.PendingDatagramWritesManager.(didWrite in _DAB463F912477C8697B1F8AEBF8BD15A)(_: NIOPosix.IOResult<Swift.Int>, messages: Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>?) -> NIOPosix.OneWriteOperationResult in PendingDatagramWritesManager.o
      function signature specialization <Arg[0] = [Closure Propagated : closure #1 (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult in NIOPosix.PendingDatagramWritesManager.triggerAppropriateWriteOperations(scalarWriteOperation: (Swift.UnsafeRawBufferPointer, Swift.UnsafePointer<__C.sockaddr>, Swift.UInt32, Swift.Optional<NIOCore.AddressedEnvelope<NIOCore.ByteBuffer>.Metadata>) throws -> NIOPosix.IOResult<Swift.Int>, vectorWriteOperation: (Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>) throws -> NIOPosix.IOResult<Swift.Int>) throws -> NIOPosix.OverallWriteResult, Argument Types : [NIOPosix.PendingDatagramWritesManager@callee_guaranteed (@unowned Swift.UnsafeRawBufferPointer, @unowned Swift.UnsafePointer<__C.sockaddr>, @unowned Swift.UInt32, @guaranteed NIOCore.AddressedEnvelope<NIOCore.ByteBuffer>.Metadata?) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)]> of generic specialization <NIOPosix.PendingDatagramWritesManager> of (extension in NIOPosix):NIOPosix.PendingWritesManager.triggerWriteOperations(triggerOneWriteOperation: (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult) throws -> NIOPosix.OverallWriteResult in PendingWritesManager.o
      function signature specialization <Arg[0] = [Closure Propagated : closure #1 (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult in NIOPosix.PendingStreamWritesManager.triggerAppropriateWriteOperations(scalarBufferWriteOperation: (Swift.UnsafeRawBufferPointer) throws -> NIOPosix.IOResult<Swift.Int>, vectorBufferWriteOperation: (Swift.UnsafeBufferPointer<__C.iovec>) throws -> NIOPosix.IOResult<Swift.Int>, scalarFileWriteOperation: (Swift.Int32, Swift.Int, Swift.Int) throws -> NIOPosix.IOResult<Swift.Int>) throws -> NIOPosix.OverallWriteResult, Argument Types : [NIOPosix.PendingStreamWritesManager@callee_guaranteed (@unowned Swift.UnsafeRawBufferPointer) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.UnsafeBufferPointer<__C.iovec>) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.Int32, @unowned Swift.Int, @unowned Swift.Int) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)]> of generic specialization <NIOPosix.PendingStreamWritesManager> of (extension in NIOPosix):NIOPosix.PendingWritesManager.triggerWriteOperations(triggerOneWriteOperation: (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult) throws -> NIOPosix.OverallWriteResult in PendingWritesManager.o
      NIOPosix.PendingStreamWritesManager.(didWrite in _E8AD929129EAA2971226E80CBC6171E1)(itemCount: Swift.Int, result: NIOPosix.IOResult<Swift.Int>) -> NIOPosix.OneWriteOperationResult in PendingWritesManager.o
      generic specialization <NIOPosix.Socket> of NIOPosix.BaseSocketChannel.close0(error: Swift.Error, mode: NIOCore.CloseMode, promise: NIOCore.EventLoopPromise<()>?) -> () in SocketChannel.o
      ...
  "_catmc_nio_atomic__Bool_load", referenced from:
      NIOPosix.BaseSocketChannel.isActive.getter : Swift.Bool in BaseSocketChannel.o
      NIOPosix.BaseStreamSocketChannel.isWritable.getter : Swift.Bool in BaseStreamSocketChannel.o
      function signature specialization <Arg[0] = [Closure Propagated : closure #1 (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult in NIOPosix.PendingDatagramWritesManager.triggerAppropriateWriteOperations(scalarWriteOperation: (Swift.UnsafeRawBufferPointer, Swift.UnsafePointer<__C.sockaddr>, Swift.UInt32, Swift.Optional<NIOCore.AddressedEnvelope<NIOCore.ByteBuffer>.Metadata>) throws -> NIOPosix.IOResult<Swift.Int>, vectorWriteOperation: (Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>) throws -> NIOPosix.IOResult<Swift.Int>) throws -> NIOPosix.OverallWriteResult, Argument Types : [NIOPosix.PendingDatagramWritesManager@callee_guaranteed (@unowned Swift.UnsafeRawBufferPointer, @unowned Swift.UnsafePointer<__C.sockaddr>, @unowned Swift.UInt32, @guaranteed NIOCore.AddressedEnvelope<NIOCore.ByteBuffer>.Metadata?) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)]> of generic specialization <NIOPosix.PendingDatagramWritesManager> of (extension in NIOPosix):NIOPosix.PendingWritesManager.triggerWriteOperations(triggerOneWriteOperation: (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult) throws -> NIOPosix.OverallWriteResult in PendingWritesManager.o
      function signature specialization <Arg[0] = [Closure Propagated : closure #1 (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult in NIOPosix.PendingStreamWritesManager.triggerAppropriateWriteOperations(scalarBufferWriteOperation: (Swift.UnsafeRawBufferPointer) throws -> NIOPosix.IOResult<Swift.Int>, vectorBufferWriteOperation: (Swift.UnsafeBufferPointer<__C.iovec>) throws -> NIOPosix.IOResult<Swift.Int>, scalarFileWriteOperation: (Swift.Int32, Swift.Int, Swift.Int) throws -> NIOPosix.IOResult<Swift.Int>) throws -> NIOPosix.OverallWriteResult, Argument Types : [NIOPosix.PendingStreamWritesManager@callee_guaranteed (@unowned Swift.UnsafeRawBufferPointer) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.UnsafeBufferPointer<__C.iovec>) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)@callee_guaranteed (@unowned Swift.Int32, @unowned Swift.Int, @unowned Swift.Int) -> (@unowned NIOPosix.IOResult<Swift.Int>, @error @owned Swift.Error)]> of generic specialization <NIOPosix.PendingStreamWritesManager> of (extension in NIOPosix):NIOPosix.PendingWritesManager.triggerWriteOperations(triggerOneWriteOperation: (NIOPosix.WriteMechanism) throws -> NIOPosix.OneWriteOperationResult) throws -> NIOPosix.OverallWriteResult in PendingWritesManager.o
      NIOPosix.PendingStreamWritesManager.description.getter : Swift.String in PendingWritesManager.o
      NIOPosix.PipeChannel.description.getter : Swift.String in PipeChannel.o
      NIOPosix.DatagramChannel.isWritable.getter : Swift.Bool in SocketChannel.o
      ...
  "_catmc_nio_atomic__Bool_create_with_existing_storage", referenced from:
      NIOPosix.PendingDatagramWritesManager.init(msgs: Swift.UnsafeMutableBufferPointer<__C.CNIODarwin_mmsghdr>, iovecs: Swift.UnsafeMutableBufferPointer<__C.iovec>, addresses: Swift.UnsafeMutableBufferPointer<__C.sockaddr_storage>, storageRefs: Swift.UnsafeMutableBufferPointer<Swift.Unmanaged<Swift.AnyObject>>, controlMessageStorage: NIOPosix.UnsafeControlMessageStorage) -> NIOPosix.PendingDatagramWritesManager in PendingDatagramWritesManager.o
      NIOPosix.PendingStreamWritesManager.init(iovecs: Swift.UnsafeMutableBufferPointer<__C.iovec>, storageRefs: Swift.UnsafeMutableBufferPointer<Swift.Unmanaged<Swift.AnyObject>>) -> NIOPosix.PendingStreamWritesManager in PendingWritesManager.o
      function signature specialization <Arg[1] = Owned To Guaranteed, Arg[2] = Owned To Guaranteed> of generic specialization <NIOPosix.ServerSocket> of NIOPosix.BaseSocketChannel.init(socket: A, parent: NIOCore.Channel?, eventLoop: NIOPosix.SelectableEventLoop, recvAllocator: NIOCore.RecvByteBufferAllocator) throws -> NIOPosix.BaseSocketChannel<A> in SocketChannel.o
      function signature specialization <Arg[1] = Owned To Guaranteed, Arg[2] = Owned To Guaranteed> of generic specialization <NIOPosix.PipePair> of NIOPosix.BaseSocketChannel.init(socket: A, parent: NIOCore.Channel?, eventLoop: NIOPosix.SelectableEventLoop, recvAllocator: NIOCore.RecvByteBufferAllocator) throws -> NIOPosix.BaseSocketChannel<A> in SocketChannel.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Same errors I’m having when use command pod lib lint for the above pod:

-> StunClient (1.0.5)
    - ERROR | xcodebuild: Returned an unsuccessful exit code. You can use `--verbose` for more information.
    - NOTE  | xcodebuild:  note: Using new build system
    - NOTE  | xcodebuild:  note: Using codesigning identity override: -
    - NOTE  | xcodebuild:  note: Build preparation complete
    - NOTE  | xcodebuild:  note: Planning
    - NOTE  | xcodebuild:  note: Building targets in dependency order
    - NOTE  | xcodebuild:  NIOPosix.BaseSocketChannel.close0(error: Swift.Error, mode: NIOCore.CloseMode, promise: NIOCore.EventLoopPromise<()>?) -> () in BaseSocketChannel.o
    - NOTE  | xcodebuild:  generic specialization <NIOPosix.Socket> of NIOPosix.BaseSocketChannel.close0(error: Swift.Error, mode: NIOCore.CloseMode, promise: NIOCore.EventLoopPromise<()>?) -> () in SocketChannel.o
    - NOTE  | xcodebuild:  merged generic specialization <NIOPosix.ServerSocket> of NIOPosix.BaseSocketChannel.close0(error: Swift.Error, mode: NIOCore.CloseMode, promise: NIOCore.EventLoopPromise<()>?) -> () in SocketChannel.o
    - NOTE  | xcodebuild:  clang: error: linker command failed with exit code 1 (use -v to see invocation)
    - NOTE  | xcodebuild:  note: Using codesigning identity override:

another evidence from the independent source - https://github.com/grpc/grpc-swift/issues/1369 - they are having the same issue.

Steps to reproduce

1. git clone git@github.com:madmag77/STUNClient.git
2. cd STUNClient
3. pod lib lint

If possible, minimal yet complete reproducer code (or URL to code)

no code needed to reproduce

SwiftNIO version/commit hash

SwiftNIO 2.38

System & version information

Please provide at the very least your operating system and Swift version information.

Ideally, run

scripts/nio-diagnose -o nio-diagnose.md PID_OF_YOUR_NIO_PROGRAM

and attach (or paste) the resulting file nio-diagnose.md into this bug report or send it to the SwiftNIO maintainers privately.

I’ve done the above and can send that file to the maintainers (need an email to send to).