llvm dev - Jan 2021 - [cmake] Third-party tools C++ standard requirements

Hi all,

A bug was recently opened on IWYU where the reporter was packaging IWYU for
Homebrew on Mac [1]. For some reason, their Apple Clang system compiler
defaulted to a C++ standard that fails to parse the LLVM headers (details
in the first page of the bug report) -- from cursory inspection it looks
like c++03.

I wonder if there should be a way for LLVM's CMake package to announce its
'-std' requirements to embedders? We could add an explicit
'-std' switch in
IWYU's build system, of course, but I figured this might be a recurring
problem for tools.

Any thoughts?

Thanks,
- Kim

[1] https://github.com/include-what-you-use/include-what-you-use/issues/867
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