[MacPorts] #60438: ports that use rust no longer able to build universal with i386

[MacPorts]

#60438: ports that use rust no longer able to build universal with i386
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  Reporter:  ryandesign                          |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.6.2
Resolution:                                      |   Keywords:
      Port:  rust librsvg racer geckodriver      |
  newsboat sequoia-pgp                           |
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Comment (by Gcenx):

 Replying to [comment:3 g5pw]:
 > > what’s stopping us from using rust version 1.41.1 to compile the very
 latest version?
 >
 > Unfortunately it doesn't compile successfully.

 Yeah it seems upstream rust has a lot of changes that require a newer
 version of rust to compile rust.
 But rust hasn't removed the i686 darwin target so can't we just use
 `--target=i686_apple_darwin`

 Here's what I found on cross-compiling rust for a new platform
 https://www.reddit.com/r/rust/comments/5ag60z/how_do_i_bootstrap_rust_to_crosscompile_for_a_new/

 But in our case we already have the support within rust source we just
 need binaries

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Ticket URL: <https://trac.macports.org/ticket/60438#comment:4>
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