add clang 16

[paulocoutinhox]

Changelog: Feature: Added clang 16 to settings.
Docs: omit
Closes: #11774

• Refer to the issue that supports this Pull Request.
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one.

^{Note: By default this PR will skip the slower tests and will use a limited set of python versions. Check here how to increase the testing level by writing some tags in the current PR body text.}

[paulocoutinhox]

@czoido done

[czoido]

Hi @paulocoutinhox,

Thanks for the contribution. Could you check that the the cppstd keeps being "gnu++14" for clang 16?

[paulocoutinhox]

Hi @paulocoutinhox,

Thanks for the contribution. Could you check that the the cppstd keeps being "gnu++14" for clang 16?

According to their website:
https://clang.llvm.org/cxx_status.html

By default, Clang builds C++ code according to the C++14 standard. You can use Clang in C++14 mode with the -std=c++14 option (use -std=c++1y in Clang 3.4 and earlier).