proposal: cmd/compile, runtime: provide ways to know supported platforms

[hirochachacha]

Sorry, it's just an idea.

Like this:

$ go tool compile -showcontexts

linux-386-cgo
linux-386
linux-amd64-cgo
linux-amd64
....

In package:

package runtime

var Contexts = []string{
  "linux-386-cgo",
  "linux-386",
  ...
}

It's not only useful for "users" but "tools" like "go tool api" as well.

https://github.com/golang/go/blob/master/src/cmd/api/goapi.go#L40-L71

[minux]

I don't think runtime should provide such information. It's better to make cmd/dist give the list and that is #12270.

[bradfitz]

Yeah, dup of #12270