Add support for Xcode 13

[janosvitok]

Changelog: Bugfix: Add support for Xcode 13/Apple clang 13.0
Docs: omit

Closes #9641

• I've read the Contributing guide.

[CLAassistant]

All committers have signed the CLA.

[czoido]

Hi @janosvitok,
I'm opening a new PR: #9643 that includes you as a contributor as well, we are in a little rush because we want to release a 1.40.2 minor with these changes ASAP and we need to change the branches.
Thanks a lot for the contribution. I'm closing this one in favor of: #9643

[janosvitok]

@czoido, I don't mind how you do it, as long as conan supports Xcode out of box :)

Cheers!

[H-G-Hristov]

How is this supposed to work. Upgrading conan I mean.

I did pip3 install conan --upgrade

I got the latest conan but when I tried to build. I still got:

-- Conan executing: /usr/local/bin/conan install . -s build_type=RelWithDebInfo -s compiler=apple-clang -s compiler.version=13.0 -s compiler.libcxx=libc++ -s compiler.cppstd=14 -s arch=arm64 -s arch_build=arm64 -s os.version=10.12 -g=cmake --build=missing
ERROR: Invalid setting '13.0' is not a valid 'settings.compiler.version' value.
Possible values are ['5.0', '5.1', '6.0', '6.1', '7.0', '7.3', '8.0', '8.1', '9.0', '9.1', '10.0', '11.0', '12.0']
Read "http://docs.conan.io/en/latest/faq/troubleshooting.html#error-invalid-setting"

So I still had to manually add: "13.0" to ~/.conan/settings.yml as before:

apple-clang: &apple_clang

    version: ["5.0", "5.1", "6.0", "6.1", "7.0", "7.3", "8.0", "8.1", "9.0", "9.1", "10.0", "11.0", "12.0", "13.0"]

[memsharded]

If you had previously modified settings.yml, the Conan migration will not overwrite your existing, modified settings.yml to avoid destroying your modifications. Try removing the settings.yml from the cache, run Conan again (any conan install command) and it will regenerate it with 13.0 in it.