building-openwrt.md

TL;DR - Use diffconfig

Initial build

• Create .config by running make menuconfig interactively
• Generate diffconfig by running ./script/diffconfig.sh and save it (e.g. ~/hoge.config)
• Do build (make)

Incremental build

• Restore diffconfig (e.g. ~/hoge.config) as .config
• Regenerate .config by running make defconfig
• Do build (make)