Rustc dependency policy

[alexcrichton]

This does raise an interesting question: is xz2 actually ok to use in the compiler? The whitelist prototype based on cargo metadata can’t differentiate…

Yeah I think @cuviper is right in that we’ll only want to have a whitelist for rustc dependencies right now, which currently have the most impact. New dependencies in libstd, for example, can cause quite a lot of ripples and new dependencies in rustc even can sometimes cause problems.

[mark-i-m]

So that would mean I should BFS the dependency DAGs of crates beginning with ‘librustc.’ and 'libsyntax.’, right? Are there any other crates I should look at?

[alexcrichton]

Ah you can probably start at the rustc crate which represents the executable itself, and I think nowadays you’d also want to start at rustc_trans, but that should do the trick!

[nikomatsakis]

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