Re: [PATCH 2/3] cmake: create compile_commands.json by default

> Some users have expressed interest in a more "batteries included" way of
> building via CMake[1], and a big part of that is providing easier access
> to tooling external tools.
>
> A straightforward way to accomplish this is to make it as simple as
> possible is to enable the generation of the compile_commands.json file,
> which is supported by many tools such as: clang-tidy, clang-format,
> sourcetrail, etc.
>
> This does come with a small run-time overhead during the configuration
> step (~6 seconds on my machine):
>     [...]
> This seems like a small enough price to pay to make the project more
> accessible to newer users.  Additionally there are other large projects
> like llvm [2] which has had this enabled by default for >6 years at the
> time of this writing, and no real negative consequences that I can find
> with my search-skills.
>
> NOTE: That the comppile_commands.json is currenntly produced only when
> using the Ninja and Makefile generators.  See The CMake documentation[3]
> for more info.