I suggest that `emerge --info` (profiles/info_pkgs (https://gitweb.gentoo.org/repo/gentoo.git/tree/profiles/info_pkgs)) be extended with:
1. Main parts of LLVM toolchain:
(sys-devel/gcc and sys-devel/binutils are already in this list.)
(sys-devel/autoconf, sys-devel/automake and dev-util/cmake are already in this list.)
(sys-apps/openrc is already in this list.)
I'd also throw rust in there.
because it's painful to request rust info from bug reporters for rust-compiled packages EVERY time.
I need to know which rust version and if it used system-llvm or not.
I've suggested this in 2018 already and it was not met with a lot of enthusiasm.