No way to just-build with code coverage enabled.

[dabrahams]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI.

Description

See this message in the forums. Everything that was true then appears to be still true today.

Expected behavior

I can

swift build --build-tests --enable-code-coverage
swift test --skip-build --enable-code-coverage

without error and it will produce a coverage report

Actual behavior

error: Unknown option '--enable-code-coverage'

Steps to reproduce

Pick any arbitrary SPM project with tests and

swift build --build-tests --enable-code-coverage
swift test --skip-build --enable-code-coverage

Swift Package Manager version/commit hash

Swift Package Manager - Swift 5.9.0

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

swift-driver version: 1.87.3 Apple Swift version 5.9.2 (swiftlang-5.9.2.2.56 clang-1500.1.0.2.5)
Target: arm64-apple-macosx14.0
Darwin davea-mbp16.corp.adobe.com 23.3.0 Darwin Kernel Version 23.3.0: Wed Dec 20 21:30:44 PST 2023; root:xnu-10002.81.5~7/RELEASE_ARM64_T6000 arm64

[grynspan]

This wouldn't be too hard to add (famous last words.) @MaxDesiatov if you like, you can assign this to me and I can get to it some time in the next couple of weeks.

[grynspan]

Note @dabrahams that code coverage is a build-time feature, so if you say swift build --build-tests and then swift test --skip-build --enable-code-coverage it wouldn't do what you want; it would need to be passed to both commands to be effective. You have that in your example, of course, but I just want to make it clear. :)