[MacPorts] #66985: poppler-qt4-mac: build against glib2-upstream: gatomic.h: error: argument 2 of '__atomic_load' must not be a pointer to a 'volatile' type

[MacPorts]

#66985: poppler-qt4-mac: build against glib2-upstream: gatomic.h: error: argument 2
of '__atomic_load' must not be a pointer to a 'volatile' type
------------------------------+--------------------
  Reporter:  barracuda156     |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.8.1
Resolution:                   |   Keywords:
      Port:  poppler-qt4-mac  |
------------------------------+--------------------

Comment (by barracuda156):

 By the way, also fails with current `glib2`. Apparently some breaking
 change occurred on the way.

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Ticket URL: <https://trac.macports.org/ticket/66985#comment:4>
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