[libc-commits] [libc] [libc][docgen] regen docgen via cmake (PR #119628)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

ok, I have that working.  One thing I think would be nice to add; I suspect there's a way to say that docgen depends on the yaml files. If those haven't changed, then docgen doesn't need to be rerun.  Looking at these docs https://cmake.org/cmake/help/latest/command/add_custom_target.html, I'm not sure if that's `DEPENDS` or `SOURCES`.

Looks like I need to rebase this pr...

https://github.com/llvm/llvm-project/pull/119628