[MacPorts] #66127: diy asks for Clang on 10.6.8 Rosetta

[MacPorts]

#66127: diy asks for Clang on 10.6.8 Rosetta
--------------------------+---------------------------------
 Reporter:  barracuda156  |      Owner:  MarcusCalhoun-Lopez
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.0
 Keywords:  powerpc       |       Port:  diy
--------------------------+---------------------------------
 `diy` asks for Clang on 10.6.8 Rosetta, where Clang is unavailable (as on
 PPC generally):
 {{{
 macmini: svacchanda$ sudo port -v install diy
 --->  Computing dependencies for diy......
 The following dependencies will be installed:
  clang-11
  clang_select
  libomp
  llvm-11
  mpich-clang11
 Continue? [Y/n]: n
 }}}

 If `diy` is known not to work with GCC `libgomp`, it should be restricted
 to systems having Clang or otherwise to non-PPC archs. Otherwise, I guess,
 it should choose GCC and `libgomp` when `cxx_stdlib` eq "libstdc++".

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Ticket URL: <https://trac.macports.org/ticket/66127>
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