Swift SDK bundle: no way to pass different toolset paths based on host supportedTriples?

[finagolfin]

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

• 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 Swift SDK Bundle spec provides a way to specify the host triples supported in info.json, but then doesn't seem to use that info anywhere.

I thought one obvious reason to specify those was to provide toolset executables for multiple hosts, but there doesn't appear to be any way to specify the different hosts in swift-sdk.json or the toolset files.

For example, if I want to specify a different cCompiler in the toolset for linux x86_64, I can configure that. However, if the same Swift SDK bundle is used on linux AArch64 or macOS x86_64, there doesn't appear to be a way to specify alternate paths for those executables also.

@MaxDesiatov, an oversight in the Swift SDK bundle spec?

Expected behavior

The doc to provide a way to specify multiple host-platform-specific executables in a Swift SDK bundle

Actual behavior

I see no info on this.

Steps to reproduce

Not implemented

Swift Package Manager version/commit hash

All

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

All