[MacPorts] #59493: gmp fails con configure on Leopard (nm ?)

[MacPorts]

#59493: gmp fails con configure on Leopard (nm ?)
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  Reporter:  rmottola  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  leopard
      Port:  gmp       |
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Comment (by kencu):

 Yes, you're right, to get past this initial error, we'll need to spec a
 newer NM to handle the output from the newer clang compilers.

 You know the drill I think, setting {{{NM=${prefix}/bin/nm}}} in the
 environment or on the build line or patch it into the {{{Makefile}}} or
 monkey with the {{{PATH}}} or otherwise force it to happen.

 It's getting rather tedious to do this for port after port after port, and
 I have come across a better way. There is a way to use an "SDK Overlay"
 with Apple software, where an SDK with some newer parts shadows the main
 fallback SDK. Kind of like our "legacysupport" idea, but with other useful
 bits like tools too. Xcode knows what to do with that. Maybe that would
 work better.

 We'll need that to build any Xcode-built software on older systems now
 that we've moved to libc++ anyway...

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Ticket URL: <https://trac.macports.org/ticket/59493#comment:1>
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