build for multiple architectures fails (--arch arm64 --arch x86_64)

[abel3cl]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

Build a Package.swift which vends an executableTarget with a dependency on a target with a dependency on a macro fails.

Running swift build --arch arm64 or swift build --arch x86_64 separately they successfully complete without any errors.
However, the command swift build --arch arm64 --arch x86_64 gives the error.

It has already been reported at #7442
Still happening with a newer clang version

Expected behavior

Build completes without errors.

Actual behavior

Build fails with error:
Unable to resolve build file: BuildFile<PACKAGE-PRODUCT:ProtocolGen::BUILDPHASE_1::14> (The workspace has a reference to a missing target with GUID 'PACKAGE-TARGET:MacroPlugin@11')

Steps to reproduce

1. Checkout https://github.com/SwiftyLab/MetaCodable
2. cd Metacodable
3. swift build --arch arm64 --arch x86_64

Swift Package Manager version/commit hash

Swift Package Manager - Swift 6.0.0-dev

Swift & OS version (output of swift --version ; uname -a)

swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx14.0

Darwin xxxxxxxxxxx 23.6.0 Darwin Kernel Version 23.6.0: Wed Jul 31 20:49:39 PDT 2024; root:xnu-10063.141.1.700.5~1/RELEASE_ARM64_T6000 arm64