Full rebuild of Swift 6.0 project when running tests

xtremekforever · June 21, 2024, 6:27pm

This is something that has been bugging me for a while, and I wonder if there are any solutions or things that can help. I've been developing a Swift 6.0 app with Visual Studio Code and the latest Swift extension (v1.10.2). So far the improvements to swift-testing are nice, but I noticed that if I build and run the app normally from the command line, like this:

swift build
swift run

The app will take around 5-6 minutes to build and run, which I'm used to. HOWEVER, if I then use the Testing tab to run some of the tests, the entire app gets rebuilt, so I need to wait another 5-6 minutes before the tests run. I can run the tests and do incremental builds from there, but as soon as I run swift build or swift run again, then the app wants to rebuild itself completely again.

This appears to be due to the fact that these flags are used by the extension when running the tests:

--enable-experimental-swift-testing --experimental-event-stream-version 0 --experimental-event-stream-output /tmp/vscodemkfifo-1718994354421 --disable-xctest -Xswiftc -diagnostic-style=llvm

So my question is, is there ANY way to get this to avoid from having to rebuild everything each time I switch between building/running and testing with the extension?

I am using the swift-6.0-DEVELOPMENT-SNAPSHOT-2024-06-19-a toolchain right now.

machineko · June 21, 2024, 6:39pm

github.com/swiftlang/vscode-swift

Using Testing makes whole package rebuild after each change from run to debug mode inside tests

opened 08:30PM - 20 Jun 24 UTC

machineko

bug

```fish Executing task: swift: Building and Running Tests > swift test --e…nable-experimental-swift-testing --experimental-event-stream-version 0 --experimental-event-stream-output /tmp/vscodemkfifo-1718907655582 --disable-xctest --filter RebuildTest\.DeviceTest\/ -Xswiftc -diagnostic-style=swift -Xswiftc -cxx-interoperability-mode=default Building for debugging... [8/8] Build complete! (0.11s) .... ✔ Test run with 3 tests passed after 0.149 seconds. true * Terminal will be reused by tasks, press any key to close it. * Executing task: swift: Build All > swift build --build-tests -Xswiftc -diagnostic-style=swift -Xswiftc -cxx-interoperability-mode=default Building for debugging... [14/369] ``` **To Reproduce** Use any Testing project run test, after it finish run debug on the same test. **Expected behavior** No rebuilding with every run (debugging tests shouldn't use .xctest?) **Environment** - OS: WSL debian 12 - Swift version Swift version 6.0-dev (LLVM bf8bbb910874156, Swift a0bb875256e41ae) Target: x86_64-unknown-linux-gnu - Visual Studio Code version: 1.90.2 - vscode-swift version: 1.10.2

It seems it’ll be fixed after next swift-test version is tagged

xtremekforever · June 21, 2024, 6:40pm

Dang I didn't find this. If this is the case that'll make life so much easier!!!

xtremekforever · July 4, 2024, 1:08pm

Seems like for now it helps to pass the -Xswiftc -DSWIFT_PM_SUPPORTS_SWIFT_TESTING flag to swift build to avoid doing a full rebuild when generating tests. It works until this issue gets fixed in the toolchain.