[MacPorts] #66285: Is it possible to hide ports that cannot be built on this Mac or OS?

[MacPorts]

#66285: Is it possible to hide ports that cannot be built on this Mac or OS?
----------------------------+----------------------
 Reporter:  ballapete       |      Owner:  (none)
     Type:  enhancement     |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.8.0
 Keywords:  tiger, leopard  |       Port:  MacPorts
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 `port -vd selfupdate` on PPC Tiger, Mac OS X 10.4.11, delivers for many
 minutes reports that this or that port has all compilers unavailable or
 blacklisted. Can't this prety useless output be suppressed?

 On the other hand port lists presumingly hundreds of ports that cannot be
 built, by whatever reason. Can't this list be suppressed?

 `port outdated` lists `xorg-server-devel` although it cannot be upgraded.
 So it is not outdated, it has finished. Why is it listed and why is port
 trying to upgrade it when invoked as `port upgrade` although it's not
 possible? If you can't do anything about it why do you mention it? And if
 completeness is a design goal: while not adding an extra verbose switch or
 simple `-vv`?

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Ticket URL: <https://trac.macports.org/ticket/66285>
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