Re: C++20 and newer C++ compiler

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hi Mark,

On Thu, Aug 11, 2022 at 3:06 AM Mark Nelson <mnelson@xxxxxxxxxx> wrote:
>
> Hi Kefu,
>
>
> Thank you for providing the links!  In the future, I think we should
> pick target compiler versions at the beginning of a release cycle, set
> the CI/CD to use them, then update our documentation and build checks to
> make sure that it's being used even before we need it.  Right now we are
> sort of in this weird state where we adopted c++20, but there does not
> appear to be working cmake checks for the compiler version and at least
> on centos, install-deps.sh doesn't appear to do the right thing.  This
> results in build failures that are difficult to diagnose if you don't
> know what to look for (ie that '<=>' isn't one of the supported features
> in gcc8 despite gcc8 supporting most of the C++20 feature set).
>
> It's really disruptive when main breaks without a clear indication of
> what's going on.  I'm all for c++20.  There are a lot of useful
> features!  I would very much appreciate it if we could just make some
> tweaks to the process so that we aren't making decisions about distros /
> compilers / major dependencies half way through the release cycle.
>

thanks for your insights and suggestions. sorry again. i tried my best anyway.

>
> Thanks,
>
> Mark
>
>
> On 8/10/22 07:34, kefu chai wrote:
> > hi folks,
> >
> > as you might have already noticed, we've made the switch to C++20. see
> > Casey's mail sent to this mailing list a couple days ago.
> >
> > another thing you need to pay attention to is, we now need to use at
> > least gcc-11 or clang-12 for compiling the tree.
> >
> > if your working flows depend on the stock C++ compiler in your distro,
> > you might need to check the version to make sure that its C++20
> > support. see also
> > https://en.cppreference.com/w/cpp/compiler_support#cpp20 . for
> > instance, if you are using ubuntu focal, you could use the ppa repo at
> > https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test or
> > prebuilt clang-12 or up at https://apt.llvm.org. if you are using
> > centos/RHEL 8, you might want to use gcc-toolset-11 or gcc-toolset-12
> > or llvm-toolset-12 .
> >
> > apparently, we are not using all the C++20 features, but we are
> > starting exploring some of them. as some of us have noticed, we have
> > started using https://wg21.link/P1185R2 in the main branch. because we
> > are now using both gcc-11 and clang-12 in our CI/CD workflows, we can
> > assure you that these two compilers should be able to compile the main
> > branch.
> >
> > i apologise for any inconvenience caused.
> >
> > cheers,
> >
>
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-- 
Regards
Kefu Chai
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