Re: cmake cxx standard and USES compiler:c++{17,14,11}-lang

Hello Nuno,

* Nuno Teixeira <eduardo@freebsd.org> [20220730 22:00]:
> I'm working on a port that have wrksrc CMakeLists.txt:
> ---
> set(CMAKE_CXX_STANDARD 17)
> set(CMAKE_CXX_STANDARD_REQUIRED ON)
> ---
> but port Makefile have:
> ---
> USES= cmake compiler:c++14-lang
> ---
> 
> Should I change it to compiler:c++17-lang?

Most likely yes.

> Do USES= compiler have any influence on cmake building?

Currently not in practice. It will just pull in a compiler from ports
*if* the base compiler doesn't offer the standard required, but as far
as I know, a base compiler supporting c++14 will also support c++17 (and
after EOL of 12, there won't be any base compilers left not supporting
these standards).

I have a review open trying to add c++20 and c++2b *and* to honor
LLVM_DEFAULT in case it will pull in llvm here:
<https://reviews.freebsd.org/D35889>

BR, Felix

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