fix: infer OUT_DIR when workspace root contains a symlink

[wasd96040501]

fix #15867

[Veykril]

Block on discussion in #15867 (comment)

[bors]

☔ The latest upstream changes (presumably #16088) made this pull request unmergeable. Please resolve the merge conflicts.

[Veykril]

Okay thanks to the explanation given in the issue I can see the point of this change now 👍

[Veykril]

Thanks!
@bors r+

[bors]

📌 Commit 9727bcf has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit 9727bcf with merge f410fb9...

[bors]

💔 Test failed - checks-actions

[wasd96040501]

It seems that unit test has failed on windows.
panic 1

thread 'root_contains_symlink_out_dirs_check' panicked at crates\rust-analyzer\tests\slow-tests\support.rs:109:56:
called `Result::unwrap()` on an `Err` value: Os { code: 183, kind: AlreadyExists, message: "Cannot create a file when that file already exists." }

panic 2

thread 'root_contains_symlink_out_dirs_check' panicked at crates\rust-analyzer\tests\slow-tests\testdir.rs:82:13:
failed to remove temporary directory C:\Users\RUNNER~1\AppData\Local\Temp\testdir\612_4\_symlink: The directory name is invalid. (os error 267)

I will attempt to fix it.

[wasd96040501]

@Veykril
CI fixed.

#[cfg(target_os = "windows")]
std::os::windows::fs::symlink_file(path, &symlink_path).unwrap();

replaced to

#[cfg(target_os = "windows")]
std::os::windows::fs::symlink_dir(path, &symlink_path).unwrap();

[Veykril]

Thanks!
@bors r+

[bors]

📌 Commit 22cda95 has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit 22cda95 with merge 87e609a...

[bors]

☀️ Test successful - checks-actions
Approved by: Veykril
Pushing 87e609a to master...