Lib package names from cargo differ (dash vs. underscore)

[adpaco-aws]

The change in rust-lang/cargo#12783 causes cargo to return lib package names which are different to the names obtained through cargo metadata. More specifically, the cargo name will use underscores (_) instead of dashes (-), otherwise they are the same.

We first noticed this discrepancy during a Rust toolchain upgrade in model-checking/kani#3102, where we worked around this issue by introducing a weaker comparison between the targets. cargo metadata was specifically mentioned in this comment from rust-lang/cargo#12783 as an area that would be affected.

What's the long-term plan to avoid the discrepancy? Does cargo metadata need to do the same replacement?

[oli-obk]

We're only processing information that cargo provides to us. So if cargo sends us dashes, we'll report dashes, if cargo sends us underscores we'll report underscores.

[weihanglo]

cargo metadata is a built-in command in Cargo. cargo_metadata is a library parsing that JSON output. If you have questions about cargo metadata please file issues against rust-lang/cargo with detailed use cases and reproduction.

[adpaco-aws]

Understood, thank you for your comments! I'll close this issue and open another one in rustlang/cargo once I've collected more details about our use-case 😄