A first look at Rust in the 6.1 kernel

This logic makes sense for people who are configuring, building and running the kernel on the same system which is mostly kernel developers. For all others - i.e. vast majority - kernel is usually configured on one system, built on another and used on many different. For that use case, the old approach (resolving unusable config options at build time) made more sense than current one (resolving at configure time). To emulate the old approach, one can use the "dummy toolchain", set of scripts in scripts/dummy-tools/ which pretend to be gcc, linker etc. capable of everything needed. People configuring distribution kernels then run "make CROSS_COMPILE=scripts/dummy-tools/ oldconfig" to get reproducible config which works as a superset of what will be actually built. So the solution here would be providing a dummy rust compiler and everything else that is needed.