[MacPorts] #69198: rust-bootstrap needs a lot of disk space to build

[MacPorts]

#69198: rust-bootstrap needs a lot of disk space to build
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  Reporter:  ryandesign      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.9.0
Resolution:                  |   Keywords:
      Port:  rust-bootstrap  |
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Comment (by ryandesign):

 `{darwin >= 16}` means it can be built on darwin 16 and later and that it
 builds differently on each darwin version. For example, usually the
 deployment target matches the OS version.

 `{darwin any >= 16}` would mean it can be built on darwin 16 and later and
 that it builds essentially identically on each darwin version. For
 example, a port that installs only documentation, or game assets, or a
 precompiled binary downloaded from the developer's site would be identical
 on any OS version. `any` changes the archive filename so that it ends with
 `.darwin_any.tbz2` instead of e.g. `.darwin_16.tbz2`. It means MacPorts on
 any user's system, regardless of OS version, will download the same
 archive. It means we only need to store one file on the packages server
 instead of one file per OS version. It also means that only one buildbot
 worker needs to build that archive. In practice, it isn't quite as
 efficient as that: if the buildbot was idle when a commit came through,
 all wokers will get notified to start their jobs at about the same time.
 They'll all check if the archive already exists on the server, which it
 doesn't, so they'll all do the build. But if the workers are busy when the
 commit comes through, maybe only the first worker to become available
 needs to build it because maybe by the time the second worker becomes
 available, the first one has already finished and uploaded the archive to
 the server.

 So if it is true that rust-bootstrap builds essentially identically
 regardless of the OS version (e.g. it forces the same deployment target
 and it does nothing else that varies by OS version) then adding `any`
 would be correct and would save build time and server space.

-- 
Ticket URL: <https://trac.macports.org/ticket/69198#comment:11>
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