Re: What's the newest C++ standard that we can target?

On Wed, Jan 8, 2025 at 10:44 AM Dimitry Andric <dim@freebsd.org> wrote:
>
> On 8 Jan 2025, at 18:31, Alan Somers <asomers@freebsd.org> wrote:
> >
> > What is the newest C++ standard that we can target in src, and be
> > confident that it will compile on all targets?  Can we use C++20?
>
> C++17 is probably the safest one, as C++20 support in libc++ 19 is
> mostly done, but not entirely complete:
>
> https://libcxx.llvm.org/Status/Cxx20.html
>
> As long as you avoid modules, and the more exotic parts, you should be
> fine. One glaring remaining issue is that std::jthread support is still
> gated under -fexperimental-library, at least until libc++ 20 comes out.
>
> That said, older existing releases don't have libc++ 19 yet, and they
> are missing a few headers too. So it depends on whether you want to
> target -CURRENT only?
>
> -Dimitry

I guess I should've mentioned that I would like to MFC to stable/14,
too.  I certainly intend to avoid exotic parts.  Is there any better
way to ensure that may code will build other than "make universe"?