Xcode 27.1 compilation error possibly due to swift versions discrepancy

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Compiling my project using Xcode 27.1 ends with an error:

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/arm64e-apple-macos.swiftinterface:1:1: error: failed to build module 'SwiftUI'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.31.4 clang-2100.3.31.1)', while this compiler is 'Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.34.1 clang-2100.3.34.1)'). Please select a toolchain which matches the SDK.
    1 | // swift-interface-format-version: 1.0
      | `- error: failed to build module 'SwiftUI'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.31.4 clang-2100.3.31.1)', while this compiler is 'Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.34.1 clang-2100.3.34.1)'). Please select a toolchain which matches the SDK.
    2 | // swift-compiler-version: Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.31.4 clang-2100.3.31.1)
    3 | // swift-module-flags: -target arm64e-apple-macos27.0 -enable-objc-interop -target-arch-variant arm64e.x1 -enable-library-evolution -language-mode 5 -O -library-level api -enable-experimental-feature AnyAppleOSAvailability -enable-upcoming-feature InferSendableFromCaptures -enable-experimental-feature DebugDescriptionMacro -enable-bare-slash-regex -user-module-version 8.0.84.1.406 -module-name SwiftUI -package-name SwiftUI

Compiling it with Xcode 27 ends without error.

Do you see any other root cause than the one mentionned: Xcode 27.1 uses swiftlang-6.4.0.34.1 clang-2100.3.34.1 while internal sdk was compiled with swiftlang-6.4.0.31.4 clang-2100.3.31.1 ?

Answer 1 · 16h

dom_ OP

16h

It also ends fine with Xcode + command line tools 27.2 Release Candidate.

cat "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/arm64e-apple-macos.swiftinterface"
// swift-interface-format-version: 1.0
// swift-compiler-version: Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.31.4 clang-2100.3.31.1)
// swift-module-flags: -target arm64e-apple-macos27.0 -enable-objc-interop -target-arch-variant arm64e.x1 -enable-library-evolution -language-mode 5 -O -library-level api -enable-experimental-feature AnyAppleOSAvailability -enable-upcoming-feature InferSendableFromCaptur
es -enable-experimental-feature DebugDescriptionMacro -enable-bare-slash-regex -user-module-version 8.0.84.1.406 -module-name SwiftUI -package-name SwiftUI
// swift-module-flags-ignorable:  -formal-cxx-interoperability-mode=off -interface-compiler-version 6.4

cat /Applications/Xcode\ 27.2\ RC.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.2.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/arm64e-apple-macos.swiftinterface
// swift-interface-format-version: 1.0
// swift-compiler-version: Apple Swift version 6.4.2 effective-5.10 (swiftlang-6.4.2.1.9 clang-2100.4.1.1)
// swift-module-flags: -target arm64e-apple-macos27.2 -enable-objc-interop -target-arch-variant arm64e.x1 -enable-library-evolution -language-mode 5 -O -library-level api -enable-experimental-feature AnyAppleOSAvailability -enable-experimental-feature Lifetimes -enable-upcoming-feature InferSendableFromCaptures -enable-experimental-feature DebugDescriptionMacro -enable-bare-slash-regex -user-module-version 8.1.13.1.406 -module-name SwiftUI -package-name SwiftUI
// swift-module-flags-ignorable:  -formal-cxx-interoperability-mode=off -interface-compiler-version 6.4.2

cat "/Applications/Xcode 27.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/arm64e-apple-macos.swiftinterface"
// swift-interface-format-version: 1.0
// swift-compiler-version: Apple Swift version 6.4 effective-5.10 (swiftlang-6.4.0.31.4 clang-2100.3.31.1)
// swift-module-flags: -target arm64e-apple-macos27.0 -enable-objc-interop -target-arch-variant arm64e.x1 -enable-library-evolution -language-mode 5 -O -library-level api -enable-experimental-feature AnyAppleOSAvailability -enable-upcoming-feature InferSendableFromCaptures -enable-experimental-feature DebugDescriptionMacro -enable-bare-slash-regex -user-module-version 8.0.84.1.406 -module-name SwiftUI -package-name SwiftUI
// swift-module-flags-ignorable:  -formal-cxx-interoperability-mode=off -interface-compiler-version 6.4

Will stick to 27 until 27.2 is released.