A simple gn+ninja+clang demo on windows.

1. The gn.exe file is downloaded from https://chrome-infra-packages.appspot.com/dl/gn/gn/windows-amd64/+/latest
2. The ninja.exe file is downloaded from https://github.com/ninja-build/ninja/releases
3. Install clang, and make sure clang.exe is in the path env variable.
4. gn gen out/helloworld
5. ninja -C out/hellworld

Credits

https://www.jiangkang.tech/2020/05/29/c/gn-gou-jian-c-xiang-mu-zhi-helloworld/