From: bors <bors@rust-lang.org>
Date: Mon, 16 Apr 2018 17:23:53 +0000 (+0000)
Subject: Auto merge of #5359 - matklad:rustc-cache, r=alexcrichton
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Auto merge of #5359 - matklad:rustc-cache, r=alexcrichton

Rustc cache

This implements rustc caching, to speed-up no-op builds.

The cache is per-project, and stored in `target` directory. To implement this, I had to move `rustc` from `Config` down to `BuildConfig`.

closes https://github.com/rust-lang/cargo/issues/5315
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d0829a2e472add75546acf4dc0545bd40b064953