dawn-cmake/docs/buiding.md

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# Building Dawn
Dawn uses the Chromium build system and dependency management so you need to [install depot_tools] and add it to the PATH.
[install depot_tools]: http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up
On Linux you need to have the `pkg-config` command:
```sh
# Install pkg-config on Ubuntu
sudo apt-get install pkg-config
```
Then get the source as follows:
```sh
# Clone the repo as "dawn"
git clone https://dawn.googlesource.com/dawn dawn && cd dawn
# Bootstrap the gclient configuration
cp scripts/standalone.gclient .gclient
# Fetch external dependencies and toolchains with gclient
gclient sync
```
Then generate build files using `gn args out/Debug` or `gn args out/Release`.
A text editor will appear asking build options, the most common option is `is_debug=true/false`; otherwise `gn args out/Release --list` shows all the possible options.
Then use `ninja -C out/Release` to build dawn and for example `./out/Release/dawn_end2end_tests` to run the tests.