Xcode 27 / Swift 6.4 not supported

[genkernel]

Just leaving it here for those who search.
xcode 26 & swift 6.3 is good. xcode 27 + swift 6.4 is bad

researcher agent said: Root cause: Swift 6.4's SwiftPM switched its default build system to swiftbuild (Apple's new swift-build engine), and that engine can't handle xtool's cross-compilation setup on Linux..

linux-box$ xtool dev build Planning... Building for debugging... [8/8] Linking prj1-App Build complete! (140.29s) Wrote to /home/node/xtool/prj1/xtool/prj1.app

Working 👍

[genkernel]

aaaaaand closed!

[genkernel]

Also smth to consider:

agent: `Yes. In Packer.build() (Sources/PackLib/Packer.swift:72) the underlying swift-build subprocess is run with:

Subprocess.run(buildConfig,
output: .currentStandardError, // stdout → xtool's stderr
error: .currentStandardError // stderr → xtool's stderr
).checkSuccess()

So all compiler warnings/errors/progress stream through live, unmodified. One quirk: swift-build's stdout is also redirected to stderr, so if you pipe xtool dev build 2>/dev/null you'd lose compiler diagnostics — grep/filter on stderr, not stdout. Non-zero exit propagates via checkSuccess().`.

Can stdout go to stdout, not stderr?

And:
For the later compile-time-per-function tracing, that'd be the -debug-time-function-bodies frontend flag — you'd need to check how PackLib's BuildSettings invokes swift-build to see if extra flags can be injected; want me to dig into that now? - I do like to measure & simplify code - what is a standard way to pass things like -debug-time-function-bodies to xtool's building setup?

[kabiroberai]

Thanks for the callout. 6.4 support will be fixed once #229 lands. Targeting sometime this week!

Keeping this open until then.

[kabiroberai]

Can stdout go to stdout, not stderr?

Seems reasonable, feel free to make a PR

what is a standard way to pass things like -debug-time-function-bodies to xtool's building setup?

I intended to add flags like -Xswiftc. Can’t remember if I already did that. If not, this could be another candidate for a small PR.

[genkernel]

Tiny #261 for stdout -> stdout.
Leaving -Xswiftc untouched, seems like a thing to do after PR #229.
Thanks for looking at it!

[kabiroberai]

Status update:

• ✅ sdk: self-updating darwin tools #110
• ✅ sdk: integrate OpenAppleMacros #101
• ✅ sdk: SwiftBuild support #229

[kabiroberai]

Released xtool v1.20.0 with support for Swift 6.4 and Xcode 27 SDKs!