[MacPorts] #71913: db48 build error with gcc: implicit declaration of function 'atomic_compare_exchange'

[MacPorts]

#71913: db48 build error with gcc: implicit declaration of function
'atomic_compare_exchange'
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:  db48          |
---------------------------+--------------------

Comment (by barracuda156):

 Yeah that is a bug in `db48`: it detects support for atomics and defines
 `HAVE_ATOMIC_SUPPORT`, but then `dbinc/atomic.h` does not have a case
 which defines `atomic_compare_exchange`. It works with gcc-4.2, because it
 just does not support atomics, so a fallback is used.

-- 
Ticket URL: <https://trac.macports.org/ticket/71913#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS