[Bug other/92121] Error using GCC 4.9.4 -- arch/x86/Makefile:166: *** CONFIG_RETPOLINE=y,

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92121

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(It looks like the kernel is simply telling you that you cannot enable
retpoline support when using GCC 4.9.4, which seems self-explanatory, and not a
GCC bug).