Re: git: adc3c128c660 - main - src.opts.mk: Require C++20 for C++ support.

On 11/18/22 8:13 PM, John Baldwin wrote:
> The branch main has been updated by jhb:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=adc3c128c6603054586a993d117e5dd808deac17
> 
> commit adc3c128c6603054586a993d117e5dd808deac17
> Author:     John Baldwin <jhb@FreeBSD.org>
> AuthorDate: 2022-11-19 04:12:28 +0000
> Commit:     John Baldwin <jhb@FreeBSD.org>
> CommitDate: 2022-11-19 04:12:28 +0000
> 
>      src.opts.mk: Require C++20 for C++ support.
>      
>      libc++ requires C++20, so mark C++ (MK_CXX) as broken if the compiler
>      does not support C++20.
>      
>      Reviewed by:    emaste
>      Differential Revision:  https://reviews.freebsd.org/D36893

This is a bit of a band-aid for now that will at least help us get
the GCC 9 builds green again.  I have amd64 world + GENERIC building with
GCC 12 as of today on a branch and will try to get that merged soon and
then switch the Jenkins job over to GCC 12.

GCC 12 requires a couple of not-quite-trivial fixes.  One is that the
libirdma version script is broken still from when it was first imported
and binutils chokes on it.  It's probably a bug in lld that it doesn't
reject it.  The second is arguably a bug in GCC that requires a one-line
change in libc++'s <type_traits> header.  There is an upstream review
for LLVM that will hopefully land soon so that I can get the green
light for merging the fix into the in-tree LLVM.

-- 
John Baldwin