From: bors <bors@rust-lang.org>
Date: Wed, 18 Apr 2018 15:09:00 +0000 (+0000)
Subject: Auto merge of #5389 - matklad:one-hard-cs-problem, r=alexcrichton
X-Git-Tag: archive/raspbian/0.35.0-2+rpi1~3^2^2^2^2^2^2^2~22^2~1^2~59
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Auto merge of #5389 - matklad:one-hard-cs-problem, r=alexcrichton

One hard cs problem

Closes https://github.com/rust-lang/cargo/issues/5313

r? @alexcrichton

Note that, due to the first commit, this still gives us all the benefits of #5249: if RUSTFLAGS is empty, we will run only a single rustc process, even if we can't cache it across different cargo invocations.
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5ac4ab14f53fe8210befca9c9178a93f7df70a41