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<main>
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<h1 id="apple-notification-group"><a class="header" href="#apple-notification-group">Apple notification group</a></h1>
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<p><strong>Github Labels:</strong> <a href="https://github.com/rust-lang/rust/labels/O-macos">O-macos</a>, <a href="https://github.com/rust-lang/rust/labels/O-ios">O-ios</a>, <a href="https://github.com/rust-lang/rust/labels/O-tvos">O-tvos</a>, <a href="https://github.com/rust-lang/rust/labels/O-watchos">O-watchos</a> and <a href="https://github.com/rust-lang/rust/labels/O-visionos">O-visionos</a> <br>
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<strong>Ping command:</strong> <code>@rustbot ping apple</code></p>
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<p>This list will be used to ask for help both in diagnosing and testing
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Apple-related issues as well as suggestions on how to resolve interesting
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questions regarding our macOS/iOS/tvOS/watchOS/visionOS support.</p>
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<p>To get a better idea for what the group will do, here are some examples of the
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kinds of questions where we would have reached out to the group for advice in
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determining the best course of action:</p>
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<ul>
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<li>Raising the minimum supported versions (e.g. <a href="https://github.com/rust-lang/rust/pull/104385">#104385</a>)</li>
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<li>Additional Apple targets (e.g. <a href="https://github.com/rust-lang/rust/pull/121419">#121419</a>)</li>
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<li>Obscure Xcode linker details (e.g. <a href="https://github.com/rust-lang/rust/pull/121430">#121430</a>)</li>
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</ul>
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<h2 id="deployment-targets"><a class="header" href="#deployment-targets">Deployment targets</a></h2>
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<p>Apple platforms have a concept of "deployment target", controlled with the
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<code>*_DEPLOYMENT_TARGET</code> environment variables, and specifies the minimum OS
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version that a binary runs on.</p>
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<p>Using an API from a newer OS version in the standard library than the default
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that <code>rustc</code> uses will result in either a static or a dynamic linker error.
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For this reason, try to suggest that people document on <code>extern "C"</code> APIs
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which OS version they were introduced with, and if that's newer than the
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current default used by <code>rustc</code>, suggest to use weak linking.</p>
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<h2 id="the-app-store-and-private-apis"><a class="header" href="#the-app-store-and-private-apis">The App Store and private APIs</a></h2>
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<p>Apple are very protective about using undocumented APIs, so it's important
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that whenever a change uses a new function, that they are verified to actually
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be public API, as even just mentioning undocumented APIs in the binary
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(without calling it) can lead to rejections from the App Store.</p>
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<p>For example, Darwin / the XNU kernel actually has futex syscalls, but we can't
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use them in <code>std</code> because they are not public API.</p>
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<p>In general, for an API to be considered public by Apple, it has to:</p>
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<ul>
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<li>Appear in a public header (i.e. one distributed with Xcode, and found for
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the specific platform under <code>xcrun --show-sdk-path --sdk $SDK</code>).</li>
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<li>Have an availability attribute on it (like <code>__API_AVAILABLE</code>,
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<code>API_AVAILABLE</code> or similar).</li>
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