From: bors <bors@rust-lang.org>
Date: Fri, 22 Dec 2017 16:55:35 +0000 (+0000)
Subject: Auto merge of #4852 - jtgeibel:cargo-install-target-dir, r=alexcrichton
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Auto merge of #4852 - jtgeibel:cargo-install-target-dir, r=alexcrichton

Always respect `CARGO_TARGET_DIR` during `cargo install`

This aligns the behavior of crates.io and `--git` sources with that of `--path`
regarding the `CARGO_TARGET_DIR` and `CARGO_BUILD_TARGET_DIR` environment
variables.  If neither environment variable is set, then a temporary directory
is still used when installing from crates.io or `--git`.

As discussed in #4725, this can be used to enable caching of artifacts between
continuous integration builds.

/cc @alexcrichton, @ishanjain28
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83912a083ea3111fc2294dfea87bae5f4687a4a2