[Development] Raising the minimum to C++20

[Thiago Macieira]

On Wednesday, 3 May 2023 09:23:53 PDT Philippe wrote:
> Not yet available with Apple CLang (I did not test today, but a fews ago).

$ clang -E -include bit -xc++ -std=c++20 /dev/null > /dev/null
$ clang --version; date
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: x86_64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/
XcodeDefault.xctoolchain/usr/bin
Wed May  3 09:33:46 PDT 2023

I don't know if it's *functional* to the point we'd need it, but we won't know 
until we try.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering
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