Use toplevel Cargo.toml for feature resolution #15069
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rust.workspace() is the entry point for global feature resolution. It loads a Cargo.toml file and ensures that all dependencies will be built with the correct set of features. Fixes: mesonbuild#13404
Add features property to cargo.Interpreter to make default features configurable; customization of which features are enabled by default is triggered by rust.workspace(). Fixes: mesonbuild#14290
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This introduces a skeletal implementation of #14639.
For now,
rust.workspace()returns an object with no methods but it triggers loading the toplevel Cargo.toml and using its[dependencies]section to prime feature resolution. For example, fixing the infamous sdroege/mandelbrot project only requires addingprior to the first invocation of
dependency.It is not meant to be a real implementation, but it shows why Cargo subprojects are currently broken and what logic is missing.
Fixes: #13404
Fixes: #14290