Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?
[X] 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
The conditions under which this issue occurs are complex, but we were able to create a project that reproduces it. You can reproduce it with the following repository:
$ git clone https://github.com/omochi/swift-deps-rebuild-bug
$ cd swift-deps-rebuild-bug
$ ./repro.bash
If a link error appears at the end of the script execution, the issue has occurred.
Below, the repository structure and the script’s process are explained.
This project consists of two packages:
the AppPackage package, which implements the main application,
and the ToyboxPackage package, which is referenced as a dependency via a local relative path.
Initially, AppPackage can be built with $ swift build.
Next, add b: Int = 0 as an argument to ToyboxCore.toyDebug.
Since this is a source-compatible change, it is expected that AppPackage can be built again without modification using $ swift build.
However, in practice, a link error occurs as shown below:
error: link command failed with exit code 1 (use -v to see invocation)
Undefined symbols for architecture arm64:
"ToyboxCore.toyDebug(a: Swift.Int) -> ()", referenced from:
AppModule.App.main() -> () in App.swift.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: fatalError
[9/14] Linking app
In this state, you cannot proceed without performing $ swift package clean.
In a practical setting, this breaks incremental builds and forces a rebuild of thousands of files, which is very inconvenient.
Expected behavior
In an originally buildable project, after making source-compatible changes, running $ swift build again should succeed.
Actual behavior
Link errors may occur.
Steps to reproduce
$ git clone https://github.com/omochi/swift-deps-rebuild-bug
$ cd swift-deps-rebuild-bug
$ ./repro.bash
Swift Package Manager version/commit hash
Swift Package Manager - Swift 5.10.0-dev
Swift & OS version (output of swift --version ; uname -a)
swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0
Darwin omochi-mbp.local 23.5.0 Darwin Kernel Version 23.5.0: Wed May 1 20:14:38 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6020 arm64
Is it reproducible with SwiftPM command-line tools:
swift build,swift test,swift packageetc?swift build,swift test,swift packageetc.Description
The conditions under which this issue occurs are complex, but we were able to create a project that reproduces it. You can reproduce it with the following repository:
https://github.com/omochi/swift-deps-rebuild-bug
Follow these steps to reproduce the issue:
If a link error appears at the end of the script execution, the issue has occurred.
Below, the repository structure and the script’s process are explained.
This project consists of two packages: the
AppPackagepackage, which implements the main application, and theToyboxPackagepackage, which is referenced as a dependency via a local relative path.Initially,
AppPackagecan be built with$ swift build.Next, add
b: Int = 0as an argument toToyboxCore.toyDebug. Since this is a source-compatible change, it is expected thatAppPackagecan be built again without modification using$ swift build.However, in practice, a link error occurs as shown below:
In this state, you cannot proceed without performing
$ swift package clean. In a practical setting, this breaks incremental builds and forces a rebuild of thousands of files, which is very inconvenient.Expected behavior
In an originally buildable project, after making source-compatible changes, running
$ swift buildagain should succeed.Actual behavior
Link errors may occur.
Steps to reproduce
Swift Package Manager version/commit hash
Swift Package Manager - Swift 5.10.0-dev
Swift & OS version (output of
swift --version ; uname -a)swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4) Target: arm64-apple-macosx14.0
Darwin omochi-mbp.local 23.5.0 Darwin Kernel Version 23.5.0: Wed May 1 20:14:38 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6020 arm64