Symbolic Link Issue in grcov 0.8.20 Causing Panic

[wxie7]

Description:

I encountered an issue with symbolic links in grcov version 0.8.20 when collecting coverage for a Rust project. If the specified binary directory contains symbolic links, grcov panics at src/llvm_tools.rs:111, with the error message:

File system loop found: xxx points to an ancestor another-path

This issue does not occur in version 0.8.18.

Steps to Reproduce:

1. Set up a Rust project with a binary directory that includes symbolic links.
2. Run coverage collection using grcov 0.8.20.
3. Observe the panic at src/llvm_tools.rs:111.

Expected Behavior:
grcov should handle symbolic links gracefully, as it does in version 0.8.18.

Environment:

• grcov version: 0.8.20
• Rust project configuration with symbolic links in the binary directory

Thank you for looking into this issue!

By the way, the project being collected for coverage is the Rust compiler

[wxie7]

Strangely, this problem does not occur when using the binary in release, but it does occur when compiled via cargo install.