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          |
---------------------------+-------------------------

Comment (by barracuda156):

 Replying to [comment:10 suhailskhan]:
 > >Blacklisting old compilers is not necessarily the solution we want. For
 example, if the only problem is that this code needs C99, then gcc 4.2
 supports C99 and should simply be instructed to use it via the -std=c99 or
 -std=gnu99 flag.
 >
 > After looking more into this, I found that `__VA_OPT__` is a C23/C++20
 feature.
 >
 > Replacing the `compiler.blacklist-append` line with
 `compiler.cxx_standard 2020` may be the correct solution. It fixes the
 build when I tested it on Snow Leopard, and hopefully should for Leopard
 and preview builds of Snow Leopard as well. I tried using
 `compiler.c_standard 2023` as well, but the build failed.

 If it uses modern C++ specifically, then portfile must have
 `compiler.cxx_standard`, blacklist won’t work correctly (since C++
 standard does more that compiler choice).

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Ticket URL: <https://trac.macports.org/ticket/70170#comment:11>
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