[MacPorts] #68364: rust: Update to 1.74.1

[MacPorts]

#68364: rust: Update to 1.74.1
--------------------------+---------------------------------
  Reporter:  Schamschula  |      Owner:  MarcusCalhoun-Lopez
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:
      Port:  rust         |
--------------------------+---------------------------------

Comment (by halostatue):

 Upstream is now 1.75.0, however I am failing to build either {{{rust}}} or
 {{{rust-bootstrap}}}. I’m mostly focusing on {{{rust-bootstrap}}} right
 now because it appears to be necessary to have the previous level working.

 I’m not *entirely* sure what's going on in `rust-bootstrap`, but the most
 recent build failure (setting `version_current` to `1.72.1` and
 `version_m1` to `1.71.1`) is

 {{{
 :info:build Unexpected rustc version: 1.69.0, we should use 1.70.x/1.71.1
 to build source with 1.71.1
 }}}

 It appears that this (1.69.0)  is from `rust.add_bootstrap_components` (in
 `_resources/port1.0/group/rust-1.0.tcl:146`) and that points to
 `https://github.com/MarcusCalhoun-
 Lopez/rust/releases/download/${version_current}:macports_vendor`, which I
 think has been mentioned in other tickets or the mailing lists as a
 slightly odd dependency.

 There's some dependencies that I don’t understand which, if I didn’t want
 to shift mostly to MacPorts for my package management, I would be
 seriously thinking about switching *back* to `rustup` and `cargo install`
 and/or `cargo binstall` for any rust-based dependencies.

 It would be good to get some guidance from the port and port group owner
 on the right way to upgrade these ports, because I’m willing to spend some
 time helping out with this, but my Tcl-fu is not strong and there appear
 to be a number of undocumented procedural steps that are required (what's
 bootstrap-transition vs bootstrap, etc.).

 This is made more difficult by the fact that I *know* that on macOS, the
 only supported architectures are x86_64 and arm64 and OS versions 10.12 or
 higher. I don't think that Rust has ever had `powerpc-apple-darwin`
 targets and `i686-apple-darwin` is a Tier 3 target (might work, might not,
 poorly supported), so some of the architecture choices seem questionable
 in the `rust`/`rust-bootstrap` portfiles.

 I’m sure that there's good reasons behind the choices, but from my
 perspective, I can't reason them out.

-- 
Ticket URL: <https://trac.macports.org/ticket/68364#comment:14>
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