error: redefinition of module 'SwiftBridging'

[shikiroot]

Output of brew config

HOMEBREW_VERSION: 4.4.4
ORIGIN: https://github.com/Homebrew/brew
HEAD: 824efa8836dc226aa92dbbf7404c1b4a66707cca
Last commit: 4 days ago
Core tap JSON: 08 Nov 05:49 UTC
Core cask tap JSON: 08 Nov 05:49 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 10
Homebrew Ruby: 3.3.5 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.5/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 16.0.0 build 1600
Git: 2.47.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.1-arm64
CLT: 16.1.0.0.1.1729049160
Xcode: N/A
Rosetta 2: false

Output of brew doctor

Warning: No Cask quarantine support available: unknown reason.

Description of issue

Device: M1 Pro MBP
OS: 15.1
While using brew upgrade <cask> or brew upgrade --greedy, return:

/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 effective-5.10 (swiftlang-6.0.0.7.43 clang-1600.0.25.3)', while this compiler is 'Apple Swift version 6.0.2 effective-5.10 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)'). Please select a toolchain which matches the SDK.
    3 | // swift-module-flags: -target arm64e-apple-macos15.1 -target-variant arm64e-apple-ios18.1-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 3107 -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 effective-5.10 (swiftlang-6.0.0.7.43 clang-1600.0.25.3)', while this compiler is 'Apple Swift version 6.0.2 effective-5.10 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)'). 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:
/opt/homebrew/Library/Homebrew/cask/utils/quarantine.swift:3:8: error: failed to build module 'Foundation'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 6.0 effective-5.10 (swiftlang-6.0.0.7.43 clang-1600.0.25.3)', while this compiler is 'Apple Swift version 6.0.2 effective-5.10 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)'). Please select a toolchain which matches the SDK.
 1 | #!/usr/bin/swift
 2 |
 3 | 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 effective-5.10 (swiftlang-6.0.0.7.43 clang-1600.0.25.3)', while this compiler is 'Apple Swift version 6.0.2 effective-5.10 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)'). Please select a toolchain which matches the SDK.
 4 |
 5 | struct SwiftErr: TextOutputStream {

Tried sudo rm -rf /Library/Developer/CommandLineTools/ and xcode-select --install, issue still exist.
Use swift $(brew --repo)/Library/Homebrew/cask/utils/quarantine.swift return same error.

[carlocab]

Seems related to Homebrew/brew#18656, and will likely be fixed by Homebrew/brew#18656 (comment)

[Bo98]

We've seen some reports of bugs with xcode-select --install where multiple CLT versions get installed together, which breaks things entirely.

If you can, it's worth trying sudo rm -rf /Library/Developer/CommandLineTools/ and then instead of xcode-select --install download "Command Line Tools for Xcode 16.1" from here: https://download.developer.apple.com/Developer_Tools/Command_Line_Tools_for_Xcode_16.1/Command_Line_Tools_for_Xcode_16.1.dmg (needs a developer account but that's free).

(note for future readers: check https://developer.apple.com/download/all/ if you're reading this a few weeks from now as there may be a newer version - 16.2 will probably be out in December)

[aaronblair]

This worked for me. I hope that this swift dependency issue gets fixed long term. Cheers!

[shikiroot]

Does not work for me. Tried on a new MBP 15.1, install CLT, then install homebrew, still get Warning: No Cask quarantine support available: unknown reason. while running brew doctor and same error with swift $(brew --repo)/Library/Homebrew/cask/utils/quarantine.swift.