https://bugzilla.kernel.org/show_bug.cgi?id=207173 --- Comment #5 from zoran.davidovac@xxxxxxxxx --- I've back-ported kvm and instead loop changed to while as in 5.4 and I could compile it. But I found what the problem is. In short I can compile it with -O2 , -O2 -march=native, but NOT with -O3 with or without -march=native. Further more in kernel menuconfig optimization I see only O2 an Os(ize) now!? How to reproduce: -use my config -edit Makefile and replace -O2 to -O3 and you will get this error. I always compile stock kernel with -O3 -march=native for servers and my laptop with -Ofast -march=native for ages without any problem :) On error .kvm_main.o.cmd is not generated, thank you Sean, you made me look to something that I would never suspect as I had same compile problem on server, laptop and virtual server. -- You are receiving this mail because: You are watching the assignee of the bug.