[clang] [clang-format][CMake] Generate formatting options docs during build (PR #113739)

[via cfe-commits]

mydeveloperday wrote:

> > I'd personally like a solution that doesn't remove the ClangFormatStyleOptions.rst from the review
> 
> Could we just test that the output looks as expected? I think it would be pretty easy to write a lit test that asserts all of the output is as expected. That would then show up in review.
> 
> It would be a bit of a hack, but it would solve the original problem, making sure that the docs actually get updated with the script automatically, and that things show up in review.

As a reviewer that means we have to download the review, rebuild the rst then check it. I don't quite understand the problem we are trying to solve here? Given that the python script unpacks the Format.h and makes the rst I would prefer to see the finished rst as part of the review. Sorry this doesn't fit your agenda but your not the one doing the reviews!

https://github.com/llvm/llvm-project/pull/113739