[MacPorts] #38814: libstdcxx subport's linkage on libgcc_eh.a incorrectly causes the usage of two different unwinders

[MacPorts]

#38814: libstdcxx subport's linkage on libgcc_eh.a incorrectly causes the usage of
two different unwinders
------------------------+------------------------
  Reporter:  howarth@…  |      Owner:  jeremyhu@…
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.1.3
Resolution:             |   Keywords:
      Port:  libstdcxx  |
------------------------+------------------------

Comment (by howarth@…):

 The actual crash seem to occur at
 {{{
 0x00007fff92dfc168 in pthread_getspecific ()
 0x00007fff92dfc171 in pthread_getspecific ()
 0x000000010009df00 in __emutls_get_address ()
 0x000000010009df03 in __emutls_get_address ()
 0x000000010009df06 in __emutls_get_address ()
 0x000000010009df0c in __emutls_get_address ()
 0x000000010009df0f in __emutls_get_address ()
 0x000000010009df12 in __emutls_get_address ()
 0x000000010009df18 in __emutls_get_address ()
 0x000000010009df1d in __emutls_get_address ()
 0x000000010009df21 in __emutls_get_address ()
 0x000000010009df24 in __emutls_get_address ()
 0x000000010009df26 in __emutls_get_address ()
 0x000000010009df29 in __emutls_get_address ()
 0x000000010009df2a in __emutls_get_address ()
 0x000000010009df2b in __emutls_get_address ()
 0x000000010009df2d in __emutls_get_address ()
 0x000000010009df2f in __emutls_get_address ()
 0x000000010009df31 in __emutls_get_address ()
 0x000000010008db90 in __once_proxy ()
  }}}

 I'll reattempt building the previous packaging with a full bootstrap to
 see if that helps eliminate the problem.

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Ticket URL: <https://trac.macports.org/ticket/38814#comment:6>
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