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Logging: Add a section about setting up on Android #128

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28 changes: 28 additions & 0 deletions docs/Build & Debug/Logging.md
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Expand Up @@ -81,6 +81,34 @@ Set the `WEBKIT_DEBUG` environment variable.
WEBKIT_DEBUG=Scrolling Tools/Scripts/run-minibrowser --gtk --debug
```

### Android

The WPE port can be built for Android, where it integrates with the system
`logd` service. The log channel configuration is read from the
`debug.log.WPEWebKit` system property, which can be set using the `setprop`
command line tool:

```sh
adb shell setprop debug.log.WPEWebKit 'WebGL,Media=error'
```

Additionally, the `log.tag.WPEWebKit` property is used to configure a global
filter for all the messages produced by WebKit:

```sh
adb shell setprop log.tag.WPEWebKit VERBOSE
```

The `persist.` prefix may be added to either system property to store the
setting across device reboots.

Android logs can then read with `logcat`:

```sh
adb logcat -s WPEWebKit
```


### macOS

On macOS, you can, for example, enable the `Language` log channel with these terminal commands:
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