error: fatalError when building tests for swift-testing

[compnerd]

Description

When building swift-testing on Windows, we get a rather unhelpful error of:

Linking C:\Users\WDAGUtilityAccount\swift-testing\.build\x86_64-unknown-windows-msvc\debug\swift-testingPackageTests.xctest
error: fatalError

Enabling verbose builds yields the following:

lld-link: error: duplicate symbol: main
>>> defined at C:\\Users\\WDAGUtilityAccount\\swift-testing\\.build\\x86_64-unknown-windows-msvc\\debug\\TestingMacros.build\\TestingMacrosMain.swift.o
>>> defined at C:\\Users\\WDAGUtilityAccount\\swift-testing\\.build\\x86_64-unknown-windows-msvc\\debug\\swift_testingPackageTests.build\\runner.swift.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

No response

Swift Package Manager version/commit hash

No response

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

swift --version
Swift version 5.10-dev (LLVM ba9a450cf5b5694, Swift 21a47b0d0fa6b68)
Target: x86_64-unknown-windows-msvc

[neonichu]

Sounds like a dupe of #6367

[grynspan]

I think we've resolved this issue and can close it?

[compnerd]

Duplicate of #6367