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Auto merge of #30248 - petevine:master, r=brson
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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](#30196 (comment)).
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bors committed Dec 11, 2015
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Expand Up @@ -135,7 +135,7 @@ Snapshot binaries are currently built and tested on several platforms:
You may find that other platforms work, but these are our officially
supported build environments that are most likely to work.

Rust currently needs about 1.5 GiB of RAM to build without swapping; if it hits
Rust currently needs between 600MiB and 1.5GiB to build, depending on platform. If it hits
swap, it will take a very long time to build.

There is more advice about hacking on Rust in [CONTRIBUTING.md].
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1 comment on commit 01e5c48

@MagaTailor
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I'm not sure if it's worthy of a new issue but I've just noticed a mere documentation update triggered a full rust build across all architectures - that's definitely wasteful and unnecessary.

I imagine some sort of excluded files list is a good idea.

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