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runtime-interface: Implement
register_only
functions (paritytech#10640
) * runtime-interface: Implement `register_only` functions The runtime interface supports versioning of functions. Currently, if you add a new function it will be used by the runtime automatically. This results in requiring all nodes of a network to upgrade before the runtime is upgraded, otherwise they will fail to instantiate the new runtime because of missing host functions. This pr introduces `register_only` functions. This can be used when a new runtime interface function should be introduced, but the actual usage can be deferred. This means that nodes will have the host function for this, but the runtime will still use the old version of the function when being compiled for wasm. However, when a runtime is enacted that uses the new host function, the "old nodes" will already have the host function and will continue to work. * Update primitives/runtime-interface/src/lib.rs Co-authored-by: cheme <emericchevalier.pro@gmail.com> * Update primitives/runtime-interface/proc-macro/src/utils.rs Co-authored-by: cheme <emericchevalier.pro@gmail.com> * FMT Co-authored-by: cheme <emericchevalier.pro@gmail.com>
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