What is the correct and easiest way to set up OpenWrt for building packages only, and not the firmware ?
The reason for asking is, from a developers perspective of building packages, lately with OpenWrt 18 and 19 (after scripts/feeds install -a), even with SSD, doing a make package/packagename/compile takes 5-10 seconds before actually starting to build the package.
I've been using a handful of (proprietary) SDK's based on OpenWRT that only build the host build tools (m4, libtool, crosstools-gcc etc), and the packages. They are super fast to work with while developing a package. Also in chaos_calmer, the speed of building single packages was acceptable, but then the package count was much less I think. Perhaps it is just related to how many packages that are installed in the SDK.