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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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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: #13404
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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When processing cargo subprojects, each Resolver was independently
loading Cargo.lock files, leading to duplicate wraps and errors like
'Multiple wrap files provide dependency'.
Instead, build the cargo.Interpreter as soon as a Cargo.lock file is
found, and merge that Cargo.lock into the wrap resolver. There is no
need anymore to build a separate resolver for the dependent packages,
because their indirect dependencies are all listed in the parent lockfile.
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Introduce a global Cargo interpreter state that keeps track of enabled
features on each crate.
Before generating AST of a Cargo subproject, it downloads every
sub-subproject and resolves the set of features enabled on each of them
recursively. When it later generates AST for one its dependencies, its
set of features and dependencies is already determined.
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Cargo.lock is essentially identical to subprojects/*.wrap files. When a
(sub)project has a Cargo.lock file this allows automatic fallback for
its cargo dependencies.
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This is a helper, currently only used by cargo. It could be moved later
if there are other users.
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