lldb debugging is not working from version 1.46

[douglascorrea]

I tried this code:

rust-lldb target/debug/rust-str-vs-string

I expected to see this happen: To be able to use lldb commands as I can if I use lldb directly

Instead, this happened: error: file specified in --source (-s) option doesn't exist: 'lldb_commands'

Meta

rustc --version --verbose:

rustc 1.46.0 (04488afe3 2020-08-24)
binary: rustc
commit-hash: 04488afe34512aa4c33566eb16d8c912a3ae04f9
commit-date: 2020-08-24
host: x86_64-unknown-linux-gnu
release: 1.46.0
LLVM version: 10.0

The same happens on a macOS machine

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I saw that lldb_commands is on src/etc/ directory together with rust-lldb shell script, and I also saw that script calls it directly, but I'm not sure how it should behaves in my machine since the lldb_commands is not there (rustup is not installing it)

I've asked it on Rust users forum, and also in the discord chat, but no answers, so I'm considering it a bug, feel free to close it if it is something wrong with my installation and, if possible, guide me on where should I look to fix it.

[ehuss]

cc @ortem who introduced lldb_commands in #72357. I also notice the script references $RUSTC_SYSROOT which isn't set anywhere.

[douglascorrea]

The issue happens because rust-lldb expects lldb_commands and its dependencies resides on the current directory.

Just to let you know that I got it working doing this:

• Cloned this repo on ~/repos/rust:
• Edit ~/repos/rust/src/etc/lldb_commands changing the first line to: command script import ./lldb_lookup.py
• Then run the following to link the files to the current directory:

$ cargo new foobar
$ cd foobar
$ cargo build -v
$ ln -s ~/repos/rust/src/etc/lldb_commands ./
$ ln -s ~/repos/rust/src/etc/lldb_providers.py ./
$ ln -s ~/repos/rust/src/etc/lldb_lookup.py ./
$ ln -s ~/repos/rust/src/etc/lldb_batchmode.py ./
$ rust-lldb rust-lldb target/debug/foobar

[douglascorrea]

Another important highlight, as @ehuss mentioned, this is a recent change, so 1.45 was working fine and the issue appeared only on 1.46