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[idea] Allow .rmeta to be translated in .rlib files #44587

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@bjorn3

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@bjorn3

We could then teach cargo to make .rmeta files and concurrently convert them to .rlib files. If you only need .rmeta files for dependencies cargo could convert the .rmeta files when some cores are idle. This would be more efficient, as a crate can be compiled before llvm is run for its dependencies.

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    C-feature-requestCategory: A feature request, i.e: not implemented / a PR.I-compiletimeIssue: Problems and improvements with respect to compile times.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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