How to install rustup and cargo with a toolchain for all users on Linux?

Question

I am trying to install rustup with clippy, but I am looking way of installing for all users.

I installed rustup in /opt/setup. Whenever I switch users, I get this:

error: no default toolchain configured

If I try to install a toolchain it does not take /opt/setup but /home/user. I specified RUSTUP_HOME and CARGO_HOME in my .bashrc file but still it chooses /home/user. Is there a way to achieve this?

Answer 1

As of Apr 16, 2016:

It does not support it now

Even in Sept 10, 2017 the issue is still open, so I'd not wait for it, since installing Rust with clippy is straight forward.