[MacPorts] #65472: gcc12/libgcc12: has made the @rpath transition happen, now we need to manage it

[MacPorts]

#65472: gcc12/libgcc12: has made the @rpath transition happen, now we need to
manage it
--------------------------+--------------------
  Reporter:  kencu        |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libgcc, gcc  |
--------------------------+--------------------

Comment (by cjones051073):

 See last three commits to https://github.com/cjones051073/macports-
 ports/commits/gcc-iain-update

 Going to run some quick tests but then push to master quite quickly given
 the issues gcc10 and gcc11 currently have.

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Ticket URL: <https://trac.macports.org/ticket/65472#comment:7>
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