[MacPorts] #37336: libstdcxx-devel: error: 'pending_assemble_externals_processed' defined but not used [-Werror=unused-variable]

[MacPorts]

#37336: libstdcxx-devel: error: 'pending_assemble_externals_processed' defined but
not used [-Werror=unused-variable]
------------------------------+-------------------
  Reporter:  march.1.xue@…    |      Owner:  mww@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.1.2
Resolution:                   |   Keywords:
      Port:  libstdcxx-devel  |
------------------------------+-------------------

Comment (by gunnlaugur@…):

 Thanks! Attached portfile patch and patch file to `#ifdef` this variable
 appropriately. With this change it builds just fine.

 The patch is already in place upstream:
 http://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=c1946cb7e83dd1532f3fce7f5edba79f2eec86e0

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Ticket URL: <https://trac.macports.org/ticket/37336#comment:14>
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