The sys-devel/clang ebuild(s) should put run-clang-tidy into PATH. Some tools behave differently whether or not run-clang-tidy is in PATH. For example Meson (dev-util/meson) will fall back to a direct clang-tidy invocation if run-clang-tidy is not in PATH .
We're installing it where upstream installs it. You should talk to LLVM people to change the install location, or ask Meson people why they rely on random downstream changes.
Understood, created https://reviews.llvm.org/D90972
> or ask Meson people why they rely on random downstream changes.
I am not sure what this is supposed to mean? Meson has no other chance to figure out if run-clang-tidy(.py) is available besides looking it up in $PATH. Hence I think the ideal solution would be upstream changing the install location of run-clang-tidy.py from share/clang/ to bin/.