How to specify platform-specific dependencies in Rust Cargo?

Question

I need to use a crate which is hosted in my company's GitHub repo. There are two versions of this same crate for different OSes, namely vxworks and linux. In my application I have added this crate in the Cargo.toml like below depending on the target_os:

[target.'cfg(target_os = "vxworks")'.dependencies]
dep1= { git = "https://repo_url", branch = "vxworks", default-features = false }
[target.'cfg(not(target_os = "vxworks"))'.dependencies]
dep1= { git = "https://repo_url", branch = "linux", default-features = false }

When I compile I'm getting the below error:

Dependency 'dep1' has different source paths depending on the build target. Each dependency must have a single canonical source path irrespective of build target.

• Jmb: Use different names for both dependencies: dep1_vxworks and dep1_linux, then have a dep1 module that imports one or the other depending on the target, and re-exports it for the rest of your code.
• Jmb: See: stackoverflow.com/a/79200237/5397009
• Harry: @Jmb can you elaborate the issue? I was of the assumption that cargo will conditionally download and compile the platform specified crate but looks like that's not the case. Does it download both of them?
• freakish: @Harry it will conditionally download and compile. But this doesn't mean that two different dependencies can have the same name, they can't. Even when their conditions do not overlap.
• Jmb: The problem isn't about checking if your specific configuration conflicts. The problem is checking if there exists a possible configuration that conflicts.