[MacPorts] #65945: jemalloc fails on 10.5.8: Undefined symbols: _malloc_default_purgeable_zone, __Unwind_Resume using a modified MacPorts setup on 10.5 that is defaulting to use gcc11

[MacPorts]

#65945: jemalloc fails on 10.5.8: Undefined symbols:
_malloc_default_purgeable_zone, __Unwind_Resume using a modified MacPorts
setup on 10.5 that is defaulting to use gcc11
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  kencu
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, leopard, snowleopard
      Port:  jemalloc      |
---------------------------+-------------------------------------------

Comment (by kencu):

 the unwinder symbols for newer libgcc versions are in libgcc_ehs, but I
 don’t see that library on your link line… perhaps try adding it manually
 to the link as a proof-of-concept.

 see line 47+ here

 https://fossies.org/linux/gcc/libgcc/config/t-slibgcc-darwin

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Ticket URL: <https://trac.macports.org/ticket/65945#comment:8>
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