如何找到用于引导 rustc master 的 rustc 提交

Question

I'm trying to build Rust from source. From the stage0.txt I can see that the rustc used is beta-2016-04-13 and the rustc_key is c2743eb4 .

How do I find out which commit beta-2016-04-13 represents?

And if I build rustc beta will the rustc_key be a different one?

Answer 1

You actually do not need to figure out which rustc commit it is. Since Rust is bootstrapped from the previous version , you can simply use the last beta (or stable in the future, probably after the next release).

Quoting Alex Crichton in the PR that changed this:

This commit removes all infrastructure from the repository for our so-called snapshots to instead bootstrap the compiler from stable releases.

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And if I build rustc beta will the rustc_key be a different one?

No, you can build anything up to and including (meaning the beta) the next rustc version with that key.