Where can i find last kernel compilation log? -

i've compiled custom kernel:

(linux-3.17.4-gentoo, linux localhost 3.17.4-gentoo #9 smp thu may 21 16:23:08 eest 2015 x86_64 intel(r) core(tm) i3-2350m cpu @ 2.30ghz genuineintel gnu/linux)

and saw warnings few days ago. there log file can see them again?

genkernel generates log file here /var/log/genkernel.log think log made if redirect stdout , stderr file, when run make's.

make > build.log 2>&1