Some SWIFT_BACKTRACE options print a warning despite taking effect

[czechboy0]

Description

Tested on Linux, Swift 6.1.

For example, when I specify:

SWIFT_BACKTRACE=interactive=no,color=no,sanitize=no,threads=all,registers=all,images=all,output-to=/logs,format=json,symbolicate=fast

The launched process prints:

swift runtime: unknown output-to setting '/logs'
swift runtime: unknown backtracing setting 'format'
swift runtime: unknown backtracing setting 'symbolicate'

Reproduction

SWIFT_BACKTRACE=interactive=no,color=no,sanitize=no,threads=all,registers=all,images=all,output-to=/logs,format=json,symbolicate=fast
./any-swift-program-build-with-6.1-on-linux

Expected behavior

No warnings printed. Again, the options do take effect, so fixing this will just avoid confusion.

Environment

Swift version 6.1 (swift-6.1-RELEASE)
Target: aarch64-unknown-linux-gnu

Additional information

No response

[al45tair]

I tried this with the swift:6.1-jammy Docker image and I'm unable to reproduce this problem:

$ mkdir /logs
$ cat > tst.swift
func reallyCrash() {
  let ptr = UnsafeMutablePointer<Int>(bitPattern: 4)!
  ptr.pointee = 42
}

func crash() {
  reallyCrash()
}

@main
struct Hello {
  static func main() {
    print("Hello World")
    crash()
  }
}
$ SWIFT_BACKTRACE=interactive=no,color=no,sanitize=no,threads=all,registers=all,images=all,output-to=/logs,format=json,symbolicate=fast ./tst
Hello World

*** Signal 11: Backtracing from 0xaaaac2f80fa0... done ***

Segmentation fault
$ ls /logs
tst-638-0.0.json

[al45tair]

Closing for now as we can't seem to reproduce it.