[MacPorts] #64683: bind-9.18.0 build fails when bind-9.16.26 is installed

[MacPorts]

#64683: bind-9.18.0 build fails when bind-9.16.26 is installed
----------------------------+----------------------
  Reporter:  laughingtiger  |      Owner:  jmroot
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.1
Resolution:  fixed          |   Keywords:  monterey
      Port:  bind9          |
----------------------------+----------------------

Comment (by jmroot):

 I'd get to upstreaming them eventually, but by all means feel free to beat
 me to it. The Makefile.am changes are good to go as-is. The atomic stuff
 is a bit dicier in terms of upstream. They might want to check if a clang
 version that has the builtins is being used, which is harder than it
 sounds because Apple's versioning scheme is different to llvm.org's and
 AFAIK there's no feature test macro for those builtins. In my testing,
 Apple clang 425.0.28 offers the builtins but fails with an internal error
 when compiling the code that uses them, while Apple clang 77 doesn't claim
 to have them. The const thing is definitely a legitimate issue that
 they'll need to fix in order to support C11-compliant compilers, but
 casting just to remove the const is kind of gross. But the only other
 expedient fix would have been to remove const in a bunch of places where
 it is being applied to entire structs and apart from this issue is quite
 correct to use.

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Ticket URL: <https://trac.macports.org/ticket/64683#comment:15>
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