--remap-path-prefix broken in rustc version >= 1.46.0

[Bargsteen]

When compiling a rust program with --remap-path-prefix in 1.46.0, (and nightlies 1.47.0, 1.48.0) the specified prefixes in the binary are unaltered. I expected them to be changed.

When using 1.45.2 and 1.43.0, it works as expected.

Steps to reproduce

0. Make sure you are using rustc >=1.46.0, check via rustc --version
1. Create a new cargo project: cargo new --bin foo
2. Add a dependency to Cargo.toml, for example regex = "1"
3. Add code that uses this dependency, for example:

use regex::Regex;

fn main() {
    Regex::new(r"{").unwrap();
}

4. Run RUSTFLAGS=--remap-path-prefix=/home/kasper=bar cargo build --release, where /home/kasper/ is the prefix you want to change, for example your $HOME.
5. Inspect the binary using: strings target/release/foo | grep kasper (where kasper is something contained in the prefix), and see that it returns several lines.

If the same steps are taken on 1.45.2, step 5 returns no results, as expected.

Notes

The crate and code example is arbitrary, and the same behavior is observed for any combination of crates.

Software versions:

• rustc 1.46.0 (04488af 2020-08-24)
• OS: Linux (Ubuntu 20.04.1 LTS)

The following nightly versions also fail:

• rustc 1.47.0-nightly (f44c6e4 2020-08-24)
• rustc 1.48.0-nightly (1fd5b9d 2020-09-20)

[ehuss]

I believe this is essentially a duplicate of #73167. The paths should only appear if you have the rust-src component installed. Can you confirm that removing that component resolves what you are seeing?

[Bargsteen]

I believe this is essentially a duplicate of #73167. The paths should only appear if you have the rust-src component installed. Can you confirm that removing that component resolves what you are seeing?

Yes, I can confirm that removing the rust-src component essentially fixes the problem.
Closing this issue as it is a duplicate of #73167.