Fails to Build on latest MacOS

[ruze00]

error: 'unmountvolumeaftertimemachine': Invalid manifest (compiled with: ["/Library/Developer/CommandLineTools/usr/bin/swiftc", "-vfsoverlay", "/var/folders/z_/22whr6jd3q725fk9vqhjt1w00000gn/T/TemporaryDirectory.co1X3m/vfs.yaml", "-L", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-lPackageDescription", "-Xlinker", "-rpath", "-Xlinker", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-target", "arm64-apple-macosx13.0", "-F", "/Library/Developer/CommandLineTools/Library/Developer/Frameworks", "-sdk", "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk", "-swift-version", "5", "-I", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-sdk", "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk", "-package-description-version", "5.7.0", "/Users/ruze/UnmountVolumeAfterTimeMachine/Package.swift", "-o", "/var/folders/z_/22whr6jd3q725fk9vqhjt1w00000gn/T/TemporaryDirectory.QQLujn/unmountvolumeaftertimemachine-manifest"])
/Library/Developer/CommandLineTools/usr/include/swift/module.modulemap:13:8: error: redefinition of module 'SwiftBridging'
11 | //===----------------------------------------------------------------------===//
12 |
13 | module SwiftBridging {
| `- error: redefinition of module 'SwiftBridging'
14 | header "bridging"
15 |

/Library/Developer/CommandLineTools/usr/include/swift/bridging.modulemap:13:8: note: previously defined here
11 | //===----------------------------------------------------------------------===//
12 |
13 | module SwiftBridging {
| `- note: previously defined here
14 | header "bridging"
15 |

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Modules/Foundation.swiftmodule/arm64e-apple-macos.swiftinterface:5:8: error: failed to build module 'CoreFoundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
3 | // swift-module-flags: -target arm64e-apple-macos15.2 -target-variant arm64e-apple-ios18.2-macabi -enable-objc-interop -autolink-force-load -enable-library-evolution -module-link-name swiftFoundation -swift-version 5 -enforce-exclusivity=unchecked -O -library-level api -enable-upcoming-feature InferSendableFromCaptures -enable-bare-slash-regex -user-module-version 3208 -module-name Foundation -package-name ""FoundationPreview""
4 | import Combine
5 | import CoreFoundation
| `- error: failed to build module 'CoreFoundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
6 | import Darwin
7 | import Dispatch

/Library/Developer/CommandLineTools/usr/include/swift/module.modulemap: 0:
/Library/Developer/CommandLineTools/usr/include/swift/bridging.modulemap: 0:
/Users/ruze/UnmountVolumeAfterTimeMachine/Package.swift:1:8: error: failed to build module 'Foundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
1 | import Foundation
| - error: failed to build module 'Foundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK. 2 | // swift-tools-version: 5.7 3 | // The swift-tools-version declares the minimum version of Swift required to build this package. error: 'unmountvolumeaftertimemachine': Invalid manifest (compiled with: ["/Library/Developer/CommandLineTools/usr/bin/swiftc", "-vfsoverlay", "/var/folders/z_/22whr6jd3q725fk9vqhjt1w00000gn/T/TemporaryDirectory.3Dl5uJ/vfs.yaml", "-L", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-lPackageDescription", "-Xlinker", "-rpath", "-Xlinker", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-target", "arm64-apple-macosx13.0", "-F", "/Library/Developer/CommandLineTools/Library/Developer/Frameworks", "-sdk", "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk", "-swift-version", "5", "-I", "/Library/Developer/CommandLineTools/usr/lib/swift/pm/ManifestAPI", "-sdk", "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk", "-package-description-version", "5.7.0", "/Users/ruze/UnmountVolumeAfterTimeMachine/Package.swift", "-o", "/var/folders/z_/22whr6jd3q725fk9vqhjt1w00000gn/T/TemporaryDirectory.MJjCYN/unmountvolumeaftertimemachine-manifest"]) /Library/Developer/CommandLineTools/usr/include/swift/module.modulemap:13:8: error: redefinition of module 'SwiftBridging' 11 | //===----------------------------------------------------------------------===// 12 | 13 | module SwiftBridging { | - error: redefinition of module 'SwiftBridging'
14 | header "bridging"
15 |

/Library/Developer/CommandLineTools/usr/include/swift/bridging.modulemap:13:8: note: previously defined here
11 | //===----------------------------------------------------------------------===//
12 |
13 | module SwiftBridging {
| `- note: previously defined here
14 | header "bridging"
15 |

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Foundation.framework/Modules/Foundation.swiftmodule/arm64e-apple-macos.swiftinterface:5:8: error: failed to build module 'CoreFoundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
3 | // swift-module-flags: -target arm64e-apple-macos15.2 -target-variant arm64e-apple-ios18.2-macabi -enable-objc-interop -autolink-force-load -enable-library-evolution -module-link-name swiftFoundation -swift-version 5 -enforce-exclusivity=unchecked -O -library-level api -enable-upcoming-feature InferSendableFromCaptures -enable-bare-slash-regex -user-module-version 3208 -module-name Foundation -package-name ""FoundationPreview""
4 | import Combine
5 | import CoreFoundation
| `- error: failed to build module 'CoreFoundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
6 | import Darwin
7 | import Dispatch

/Library/Developer/CommandLineTools/usr/include/swift/module.modulemap: 0:
/Library/Developer/CommandLineTools/usr/include/swift/bridging.modulemap: 0:
/Users/ruze/UnmountVolumeAfterTimeMachine/Package.swift:1:8: error: failed to build module 'Foundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
1 | import Foundation
| `- error: failed to build module 'Foundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.5 clang-1600.0.30.1)', while this compiler is 'Apple Swift version 6.0.3 effective-5.10 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)'). Please select a toolchain which matches the SDK.
2 | // swift-tools-version: 5.7
3 | // The swift-tools-version declares the minimum version of Swift required to build this package.

I'm running Sequoia 15.3.2 on a Macbook M3 Max.

[SanderGit]

Confirming to have the same issue on Tahoe 26.0 on MacBook Air M3.