Swift Build: Dynamic variant PIF targets are missing from the Aggretate project

[pmattos]

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

If we include such targets in the "Aggregate" project we hit a bunch of "Unknown multiple commands produce: ..." errors, such as:

error: Multiple commands produce '/SamplePackages/BasicLibraryPackage/.build/arm64-apple-macosx/Intermediates.noindex/BasicLibraryPackage.build/Debug/BasicLibraryPackage.build/Objects-normal/arm64/BasicLibraryPackage_lto.o'
error: Multiple commands produce '/SamplePackages/BasicLibraryPackage/.build/arm64-apple-macosx/Intermediates.noindex/BasicLibraryPackage.build/Debug/BasicLibraryPackage.build/Objects-normal/arm64/BasicLibraryPackage_dependency_info.dat'
error: Multiple commands produce '/SamplePackages/BasicLibraryPackage/.build/arm64-apple-macosx/Intermediates.noindex/BasicLibraryPackage.build/Debug/BasicLibraryPackage.build/Objects-normal/arm64/BasicLibraryPackage Swift Compilation Requirements Finished'
...

As the build artifacts from "PACKAGE-TARGET:Foo" conflicts with those from "PACKAGE-TARGET:Foo-dynamic".

This is extensively documented by this comment in PR #8454.

Swift Package Manager version/commit hash

Waiting for PR #8454 to be merged

Expected behaviour

No response

Actual behaviour

No response

Steps to reproduce

1. Using macOS.
2. Clone and check out the version of swift-package-manager from GitHub with Swift Build integration code.
3. Pick a sample package with a .library product.
4. Build it using Swift Build explicitly:

swift run swift-build --build-system swiftbuild --package-path /path/to/package-with-lib

5. Open the generated .build/manifest.pif file.
6. Note how the "ALL-INCLUDING-TESTS" target does not depend on any of the *-dynamic targets.

Swift Package Manager version/commit hash

NA

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

swift-driver version: 1.125.2 Apple Swift version 6.2 (swiftlang-6.2.0.5.56 clang-1700.3.5.51)
Target: arm64-apple-macosx15.0
Darwin Paulos-MacBook-Pro.local 24.5.0 Darwin Kernel Version 24.5.0: Sat Mar 29 11:59:10 PDT 2025; root:xnu_development-11417.120.87.0.3~5/DEVELOPMENT_ARM64_T6020 arm64