I dislike to crosspost bugs, but you're more faster then the kernel people, ok original bug report is here http://bugzilla.kernel.org/show_bug.cgi?id=6453
I found another config producing this bug :
drivers/char/speakup/speakup.c:2434: error: `edit_bits' undeclared (first use in this function)
make: *** [drivers/char/speakup/speakup.o] Error 1
make: *** [drivers/char/speakup] Error 2
make: *** [drivers/char] Error 2
make: *** [drivers] Error 2
Created attachment 85754 [details]
Created attachment 85755 [details]
Reopen if you can prove that this error is caused by Gentoo kernel patchset.
Otherwise, these errors belong upstream. (And, for that matter, make randconfig
is known to produce broken .configs in 50+ % percent of cases).