-march=native no longer works right away. linker breaks now. may still be poss somehow.
always keep a backup copy of a known working “.config” , the corresponding kernel binary “bzImage” and a working initrd in a safe subdir to fall back on in case of crash / hang. In .config (i.e. make xconfig) you have to tread carefully since many options will render the kernel unbootable without further meddling.
keep in mind: you get boot fail if:
mismatch of either one component: kernel-binary “bzImage”, initrd , and stuff under /lib/modules
e.g. at some stage /lib/modules/4.17.0-1-MANJARO+
will be filled by “time sudo make modules_install” mind the + at the end, without it: BOOT FAIL