> We don't have any officially supported (or unsupported) compilers other than
> the C99 requirement. gcc and clang are of course by far the most used ones,
> so if those are covered by just testing for the availability, the platforms
> that matter most are covered and everybody else (including ancient gcc/clang)
> maybe gets a slightly degraded experience but that's life.
Ok. Is it ok to perform this check in the preprocessor (e.g. `#if
defined(__has_builtin) && __has_builtin(__builtin_cpu_supports)`) or does it
have to be done in CMakeLists? If the latter, it'll be a bit annoying without
`check_source_compiles` which is only in 3.19+.
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