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<main>
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<h1 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h1>
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<h2 id="dependencies"><a class="header" href="#dependencies">Dependencies</a></h2>
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<p>See <a href="https://github.com/rust-lang/rust/blob/master/INSTALL.md#dependencies">the <code>rust-lang/rust</code> INSTALL</a>.</p>
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<h2 id="hardware"><a class="header" href="#hardware">Hardware</a></h2>
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<p>You will need an internet connection to build. The bootstrapping process
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involves updating git submodules and downloading a beta compiler. It doesn't
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need to be super fast, but that can help.</p>
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<p>There are no strict hardware requirements, but building the compiler is
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computationally expensive, so a beefier machine will help, and I wouldn't
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recommend trying to build on a Raspberry Pi! We recommend the following.</p>
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<ul>
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<li>30GB+ of free disk space. Otherwise, you will have to keep
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clearing incremental caches. More space is better, the compiler is a bit of a
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hog; it's a problem we are aware of.</li>
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<li>8GB+ RAM</li>
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<li>2+ cores. Having more cores really helps. 10 or 20 or more is not too many!</li>
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</ul>
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<p>Beefier machines will lead to much faster builds. If your machine is not very
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powerful, a common strategy is to only use <code>./x check</code> on your local machine
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and let the CI build test your changes when you push to a PR branch.</p>
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<p>Building the compiler takes more than half an hour on my moderately powerful
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laptop. We suggest downloading LLVM from CI so you don't have to build it from source
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(<a href="./how-to-build-and-run.html#create-a-bootstraptoml">see here</a>).</p>
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<p>Like <code>cargo</code>, the build system will use as many cores as possible. Sometimes
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this can cause you to run low on memory. You can use <code>-j</code> to adjust the number
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of concurrent jobs. If a full build takes more than ~45 minutes to an hour, you
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are probably spending most of the time swapping memory in and out; try using
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<code>-j1</code>.</p>
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<p>If you don't have too much free disk space, you may want to turn off
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incremental compilation (<a href="./how-to-build-and-run.html#create-a-bootstraptoml">see here</a>). This will make compilation take
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longer (especially after a rebase), but will save a ton of space from the
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incremental caches.</p>
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