[MacPorts] #64550: freeciv @2.6.6: at_quick_exit gives -Wimplicit-function-declaration warning, false positive

[MacPorts]

#64550: freeciv @2.6.6: at_quick_exit gives -Wimplicit-function-declaration
warning, false positive
----------------------+--------------------
  Reporter:  JDLH     |      Owner:  JDLH
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:  fixed    |   Keywords:
      Port:  freeciv  |
----------------------+--------------------

Comment (by JDLH):

 I filed upstream ticket [https://osdn.net/projects/freeciv/ticket/43863
 43863 Configure script test for at_quick_exit (C11 feature) causes
 undesirable -Wimplicit-function-declaration error on macOS] to ask the
 Freeciv project to change their configuration checks so that they don't
 generate -Wimplicit-function-declaration errors. I expect it will take
 quite some time for them to make such a change, if they do at all.
 Probably Freeciv versions 2.6.x and 3.0.x will continue to generate these
 errors.

 The whitelisting of `at_quick_exit` in MacPorts should protect users from
 inconvenience for the immediate next Freeciv versions.

-- 
Ticket URL: <https://trac.macports.org/ticket/64550#comment:7>
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