Re: [MacPorts] #70170: ctpv @1.1: error: expected ‘;’, ‘,’ or ‘)’ before ‘__VA_OPT__’

[MacPorts]

#70170: ctpv @1.1: error: expected ‘;’, ‘,’ or ‘)’ before ‘__VA_OPT__’
---------------------------+-------------------------
  Reporter:  barracuda156  |      Owner:  suhailskhan
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  ctpv          |
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Comment (by suhailskhan):

 Replying to [comment:11 barracuda156]:
 > If it uses modern C++ specifically, then portfile must have
 `compiler.cxx_standard`, blacklist won’t work correctly (since C++
 standard does more than compiler choice).

 For what it’s worth, ctpv is a pure C-based project, but `__VA_OPT__`
 happens to be a C++20 feature as well as a C23 one. This is why
 `compiler.cxx_standard 2020` is valid despite the source code not having
 any C++. It still achieves the desired end result of ensuring only
 compilers that support `__VA_OPT__` are used.

 It appears that MacPorts currently does not recognize `compiler.c_standard
 2023` yet because C23 is still very recent, so using that in the Portfile
 will make it fall back to `compiler.c_standard 2017` instead, if I am not
 mistaken.

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Ticket URL: <https://trac.macports.org/ticket/70170#comment:13>
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