`rustc --help` does not show all available flags of `rustc --print`

[kanarus]

rustc --print with an invalid name, for example, x, shows:

error: unknown print request: `x`
  |
  = help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`

This seems correct, but rustc --help's description of --print is:

        --print [crate-name|file-names|sysroot|target-libdir|cfg|check-cfg|calling-conventions|target-list|target-cpus|target-features|relocation-models|code-models|tls-models|target-spec-json|all-target-specs-json|native-static-libs|stack-protector-strategies|link-args|deployment-target]
                        Compiler information to print on stdout

This list does not contain

• host-tuple
• split-debuginfo

Maybe related

• Add --print host-tuple to print host target tuple #125579 : This added --print host-tuple, but it seems not applied to rustc --help at this point

Meta

rustc --version --verbose:

rustc 1.87.0-nightly (794c12416 2025-02-21)
binary: rustc
commit-hash: 794c12416b2138064af1f2746646973fafd9419d
commit-date: 2025-02-21
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

[jieyouxu]

I seem to recall that list is manually edited but could be wrong.

[Noratrieb]

Yeah, that seems to be the case.
The very easy but not great PR is to just change help to match again, but it would be even nicer if this was wired up in a way that didn't require editing it manually, because it will definitely be forgotten again.

[mtoner23]

Hi, new to rust development, but i have a change locally to make this always print every --print type. i'll get it in a PR later tonight