[MacPorts] #58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15

[MacPorts]

#58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15
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  Reporter:  vdoublie  |      Owner:  jmroot
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  python37  |
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Comment (by vdoublie):

 I sort of did:
 I kept my "old port installed under Mojave + Xcode 10 stuff" and it is
 still working under Catalina... as long as I don't touch it.
 SO
 I moved out of the way the "old Mojave" stuff (Macports directory, and
 /opt/local
 the rebuild macports using GitHub (so I am up to date port wise"
 then just port install python37 - so it has to rebuild everything from
 scratch
 and it builds no sweat... but it is only very recent. So it suspect that
 this is a port that does not like to "see beta or pre-release" or anything
 that is not "user/public release"
 as I submitted forcing MACOSX_DEPLOYMENT_TARGETto 10.14 (so mascaraing it)
 in the makefile.pre did the trick... for just that part of the code... if
 the target is  10.15 up until this special part of the make then reset
 just after ... it build also as should be... so It really a PB of the
 generate_posix_var that cannot find a rule somewhere for "unknown forward
 versions of the platform"

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Ticket URL: <https://trac.macports.org/ticket/58882#comment:29>
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