# Linux Kernel Module Cheat

#### 38.13.4. Buildroot build variants

Allows you to have multiple versions of the GCC toolchain or root filesystem.

Analogous to the Linux kernel build variants but with the `--build-id` option instead:

    ./build-buildroot
    git -C "$(./getvar buildroot_source_dir)" checkout 2018.05
    ./build-buildroot --buildroot-build-id 2018.05
    git -C "$(./getvar buildroot_source_dir)" checkout -
    ./run
    ./run --buildroot-build-id 2018.05