[MacPorts] #64827: Remove a ban of gcc10 in mpi Port group

[MacPorts]

#64827: Remove a ban of gcc10 in mpi Port group
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.7.2
Resolution:                |   Keywords:  mpi
      Port:  mpich         |
---------------------------+--------------------

Comment (by barracuda156):

 Replying to [comment:1 kencu]:
 > gcc10 is not as yet supported in MacPorts on < 10.6 as all the work
 needed to integrate it (or even get it to build smoothly) has not been
 done yet. Perhaps someday it might be, if someone like you gets
 enthusiastic enough and does it !
 >
 > Until gcc10 is available in MacPorts, eg by doing this:
 >
 > {{{
 > sudo port -v install gcc10
 > }}}

 That’s what I tried obviously and it failed. In particular, sundials fails
 to configure complaining about incompatible fortran.
 The problem is nowhere obvious since I have mpich-gcc10 built, gcc10 with
 gfortran working, yet configure complains.
 Eventually I began googling the specific error, and that led me to mpi
 port group file. Bingo: the error has been caused precisely by it.

 > the ban must stay.
 >
 > Aside:
 >
 > Looking at that block, it looks like gcc9, 10, and 11 are banned on
 os.major < 12.
 >
 > If that is true and I'm reading that correctly, note that all gcc
 compilers build on os.major 10 and 11 for a year or so now, so that might
 be out of date.

 It’s up to you to decide, of course, but it seems we agree that at least
 Darwin10 upwards should not be excluded?
 (I don’t see any positive utility in this ban tbh. If compiler doesn’t
 work obviously one cannot build mpich on its base, so banning is
 redundant. On the other hand if someone fixes compiler then this ban
 causes unasked error which may not be easy to trace.)

-- 
Ticket URL: <https://trac.macports.org/ticket/64827#comment:2>
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