[MacPorts] #66927: Boost: backport fix for context from boost181 or upgrade default one to boost181?

[MacPorts]

#66927: Boost: backport fix for context from boost181 or upgrade default one to
boost181?
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  powerpc, leopard, snowleopard
      Port:  boost         |
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Comment (by barracuda156):

 Replying to [comment:3 mascguy]:
 > Replying to [comment:1 ryandesign]:
 > > So if we want to change the default boost version in the boost
 portgroup, we have to simultaneously make one of two changes in every port
 that uses the boost portgroup and does not specify the boost version:
 either revbump and verify it still builds and works with the new boost
 version, or modify the port to specify the old formerly-default boost
 version.
 > >
 > > That would be a large amount of work to do at once, so I would be in
 favor of an approach where, for every port that uses the boost portgroup
 and does not specify the boost version, we modify them, gradually over
 time (for example when updating them to a new version) so that they
 specify the boost version. Then eventually we can remove the default boost
 version from the boost portgroup, ensuring that every port that
 subsequently uses the boost portgroup will have to specify the boost
 version.
 >
 > Yes, compared to all of that, applying the context fix - assuming the
 same patch can be used verbatim (?) for 1.76 to 1.80 - is downright
 trivial.
 >
 > So Sergey, if you want to submit a PR with that change for 1.76 to 1.80,
 that's certainly fine. Particularly if it only affects PPC builds.

 We could do that, sure.

 Perhaps let us try fixing `ppc64` first? So that we do not need an extra
 PR affecting every Boost version.

 P. S. Reminder to myself and FYI: there are several fixes to backport in
 order for old Boost to be as usable as newer ones:
 1. Fixes for `ppc` (and hopefully `ppc64`) libcontext.
 2. Fix for `fiber`.
 3. Fix for `multiprecision` header inclusion.
 4. Fix for `atomics`.
 All of these are PPC-only, yes. Boost 1.80 is broken with GCC, I believe,
 so a fix for that may be also backported from 1.81 (this is not PPC-
 specific).

-- 
Ticket URL: <https://trac.macports.org/ticket/66927#comment:4>
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