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

When building swift-foundation with the swiftbuild build system, SwiftPM fails with the following error repeated many times:

error: /usr/lib/swift/_FoundationCShims/module.modulemap:1:8 redefinition of module '_FoundationCShims' error: SwiftCompile normal aarch64 /Repos/Public/swift-foundation/Sources/FoundationEssentials/WinSDK+Extensions.swift failed with a nonzero exit code. Command line: cd /Repos/Public 

Expected behavior

I expect SwiftPM to successfully build/test swift-foundation like it does with the existing build system

Actual behavior

Build log output: output.txt

It appears that the build system is confusing the local _FoundationCShims module (built in the package) with the module that is shipped with the toolchain.

Steps to reproduce

1. Checkout swift-foundation
2. Run swift test --build-system swiftbuild

Swift Package Manager version/commit hash

10/17 Nightly Main Toolchain

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

Swift version 6.3-dev (LLVM d8e7cc748ee6e7f, Swift a07ea37d0054945) Target: aarch64-unknown-linux-gnu Build config: +assertions Linux nightly-noble 6.1.68 #1 SMP Fri Nov 22 18:05:17 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux