[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 barracuda156):

 Replying to [comment:7 kencu]:
 > what is in gcc10-bootstrap is not relevant here, of course….
 >
 > edit: apologies, I just reread you and it seems you switched to
 gcc10-bootstrap purposefully.

 Yes, to rule out incorrect symlynks or w/e in `libgcc`. (While I did not
 patch `gcc` on 10.5.8, I had to reinstall it several times due to
 `+universal` not working properly, so to be on a safe side I checked with
 bootstrap version of it. But same error anyway.)

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Ticket URL: <https://trac.macports.org/ticket/65945#comment:10>
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