[18.09] rustc is broken on nightly

[evanjs]

Issue description

rustc seems to be broken broken on nightly (at least on my NixOS machines)

Steps to reproduce

1. Update nightly toolchain with rustup: rustup update
2. Run rustc -vV

Technical details

[evanjs@nixentoo:~/src/rrbg]$ rustc -Vv
rustc 1.33.0-nightly (b92552d55 2019-01-06)
binary: rustc
commit-hash: b92552d5578e4544006da0dd5e793a19c2149321
commit-date: 2019-01-06
host: x86_64-unknown-linux-gnu
release: 1.33.0-nightly
error: couldn't load codegen backend "/home/evanjs/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/librustc_codegen_llvm-llvm.so": "libstdc++.so.6: cannot open shared object file: No such file or directory"

$ nix-shell -p nix-info --run "nix-info -m"

• system: "x86_64-linux"
• host os: Linux 4.19.13, NixOS, 18.09.1829.0396345b794 (Jellyfish)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.3
• channels(root): "nixos-18.09.1834.9d608a6f592, nixos-unstable-small-19.03pre164737.a4e098519b3, nixpkgs-unstable-19.03pre164887.4001dd679f3, stable-18.03.133389.b551f89e256"
• channels(evanjs): ""
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

[evanjs]

Looks similar to this issue

[evanjs]

Yup, it's upstream.
rust-lang/rust#57426