Auto merge of #30248 - petevine:master, r=brson
Running `/usr/bin/time -v make` to build rust (using local llvm) shows the maximum memory usage at 715 megabytes on 32-bit x86 (on arm linux it's even less @ 580M). Reworded according to @brson's [input](https://github.com/rust-lang/rust/pull/30196#issuecomment-162088921).
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@ -135,7 +135,7 @@ Snapshot binaries are currently built and tested on several platforms:
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You may find that other platforms work, but these are our officially
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You may find that other platforms work, but these are our officially
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supported build environments that are most likely to work.
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supported build environments that are most likely to work.
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Rust currently needs about 1.5 GiB of RAM to build without swapping; if it hits
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Rust currently needs between 600MiB and 1.5GiB to build, depending on platform. If it hits
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swap, it will take a very long time to build.
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swap, it will take a very long time to build.
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There is more advice about hacking on Rust in [CONTRIBUTING.md].
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There is more advice about hacking on Rust in [CONTRIBUTING.md].
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