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[embedded] Update embedded UserManual.md to explain how to use a macOS downloadable toolchain #80147

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Mar 20, 2025
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[embedded] Update embedded UserManual.md to explain how to use a macOS downloadable toolchain #80147

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13 changes: 13 additions & 0 deletions docs/EmbeddedSwift/UserManual.md
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Expand Up @@ -37,6 +37,19 @@ $ swiftc -target <target triple> -enable-experimental-feature Embedded -wmo \
input1.swift input2.swift ... -c -o output.o
```

On macOS, it's common to have Xcode installed, which comes with a toolchain that does not support Embedded Swift yet. Unless you download, install, and activate a swift.org toolchain, you'll see this error:

```bash
$ swiftc input1.swift -enable-experimental-feature Embedded -wmo
<unknown>:0: error: unable to load standard library for target 'arm64-apple-macosx15.0'
```

To resolve it, download and install a nightly toolchain from swift.org. Then, don't forget to activate it in your terminal by setting the `TOOLCHAINS` environment variable, for example with this command (if you installed into the `/Library` path):

```bash
$ export TOOLCHAINS=$(plutil -extract CFBundleIdentifier raw /Library/Developer/Toolchains/swift-latest.xctoolchain/Info.plist)
```

## Examples

### Building Swift firmware for an embedded target
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