--remap-path-prefix does not remap all path prefixes

[ChrisDenton]

I'm using the x86_64-pc-windows-msvc toolchain and target.

My system environment variables:

CARGO_HOME = C:\Users\Chris\AppData\Local\Programs\Cargo
RUSTUP_HOME = C:\Users\Chris\AppData\Local\Programs\Rust
CARGO_TARGET_DIR = Z:\target

Without setting --remap-path-prefix the final binary has source paths from CARGO_HOME and RUSTUP_HOME. It also has a .pdb file (Windows debug file) in CARGO_TARGET_DIR.

When setting --remap-path-prefix I had to be careful with path separators as the replacement is documented as being "purely textual" (which is honestly a bit scary considering Rust will freely mix path separators on Windows, though hopefully it's not an issue in this case).

Ok so I set RUSTFLAGS:

$env:RUSTFLAGS = "--remap-path-prefix=C:\Users\Chris\AppData\Local\Programs\Cargo\=src --remap-path-prefix=C:\Users\Chris\AppData\Local\Programs\Rust\=rsrc --remap-path-prefix=Z:\target\=target"

Then, after cleaning the target directory, I built ripgrep (as a presumably representative project). I used the command:

git clone https://github.com/BurntSushi/ripgrep
cd ripgrep
cargo +nightly build --release

As expected, this replaced the CARGO_HOME prefix in the final binary. However it did not replace all the RUSTUP_HOME path prefixes. Specifically with this prefix:

C:\Users\Chris\AppData\Local\Programs\Rust\toolchains\nightly-x86_64-pc-windows-msvc\lib/rustlib/src/rust\library\

It also didn't remap the path to the .pdb file. This is somewhat expected as changing that requires setting a linker argument.

Meta

rustc --version --verbose:

rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
binary: rustc
commit-hash: 07e0e2ec268c140e607e1ac7f49f145612d0f597
commit-date: 2021-03-24
host: x86_64-pc-windows-msvc
release: 1.53.0-nightly
LLVM version: 12.0.0

Notes

• Changing --remap-path-prefix to a single common base directory didn't help.
• Stable (1.51) has the same issue.

[chemsaf3]

will this also help with similar cargo issue rust-lang/cargo#9311 ?

[ChrisDenton]

@chemsaf3 Could you try setting --remap-path-prefix and see if it works for you? You can do so by setting the RUSTFLAGS environment variable to something like this:

--remap-path-prefix=D:\REDACTED\.cargo\registry=registry

Then do:

cargo clean
cargo build --release

[chemsaf3]

i tried that and in my case it did not work

[ehuss]

Do you maybe have the rust-src component installed? There's a known issue with it (#73167).

[ChrisDenton]

Ah, that would be it then. I somehow missed that when searching for issues. I'll close this in favour of that issue.

[chemsaf3]

Do you maybe have the rust-src component installed? There's a known issue with it (#73167).

i do not have rust-src installed via rustup when i list components

[chemsaf3]

@ehuss can you reopen please? i dont have rust-src installed and have this issue

[ehuss]

@chemsaf3 I recommend opening a new issue. Please try to include very exact steps on how to reproduce.

[chemsaf3]

@ehuss @ChrisDenton already provide exact steps

[ChrisDenton]

@chemsaf3 I'm unable to reproduce this issue without the rust-src component installed. It would help if you could create your own issue with the exact steps you've taken so I can try to reproduce that.