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Auto merge of #13232 - Alexendoo:path-prefix, r=flip1995

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Add path prefixes back when compiling `clippy_dev` and `lintcheck`

`cargo dev` and `cargo lintcheck` use `--manifest-path` to select the package to compile, with this Cargo changes the CWD to the package's containing directory meaning paths in diagnostics start from e.g. `src/` instead of `clippy_dev/src/`

Lintcheck uses a `--remap-path-prefix` trick when linting crates to re-add the directory name in diagnostics:

5ead90f13a/lintcheck/src/main.rs (L93-L94)

5ead90f13a/lintcheck/src/main.rs (L102-L103)

It works well as far as I can tell, when absolute paths appear they stay absolute and do not have the prefix added

[`profile-rustflags`](https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#profile-rustflags-option) allows us to set per package `RUSTFLAGS` in order to use the same trick on the `clippy_dev` and `lintcheck` packages themselves

Now when you run into warnings/errors the filename will be correctly clickable

Before
```
error[E0425]: cannot find value `moo` in this scope
  --> src/lib.rs:41:5
   |
41 |     moo;
   |     ^^^ not found in this scope
```

After
```
error[E0425]: cannot find value `moo` in this scope
  --> clippy_dev/src/lib.rs:41:5
   |
41 |     moo;
   |     ^^^ not found in this scope
```

r? `@flip1995`

changelog: none
This commit is contained in:
bors 2024-08-07 18:53:50 +00:00
commit f2deab375c
1 changed files with 7 additions and 0 deletions
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7
.cargo/config.toml
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@ -13,6 +13,13 @@ target-dir = "target"
[unstable]
binary-dep-depinfo = true
profile-rustflags = true
[profile.dev]
split-debuginfo = "unpacked"
# Add back the containing directory of the packages we have to refer to using --manifest-path
[profile.dev.package.clippy_dev]
rustflags = ["--remap-path-prefix", "=clippy_dev"]
[profile.dev.package.lintcheck]
rustflags = ["--remap-path-prefix", "=lintcheck"]