cargo metadata and --no-default-features

[jadamcrain]

I have the following workspace:

https://github.com/stepfunc/rodbus

The main crate rodbus has default features serial and tls.

Workspace projects rodbus-ffi and rodbus-ffi-java have features that just activate the corresponding dependency features, e.g., in rodbus-ffi Cargo.toml:

[features]
default = ["serial", "tls"]
serial = ["rodbus/serial"]
tls = ["rodbus/tls"]

I cannot for the life of me figure out how to produce metadata that properly excludes the default features. I want to be able to use cargo metadata to produce a custom SBOM under different feature configurations, but I seem to always get all the dependencies even with the --no-default-features flag.

Any tips for debugging this?

[ehuss]

cargo metadata is currently only capable of resolving a workspace as a whole. That means all workspace members participate in resolving the features. In your workspace, rodbus-bindings enables the default features of rodbus-ffi. Setting default-features=false for that dependency can remove it.
rust-lang/cargo#7754 is tracking this limitation.

[jadamcrain]

Extremely helpful, ty.