Sources:
http://preshing.com/20141119/how-to-build-a-gcc-cross-compiler/
https://www.raspberrypi.org/documentation/linux/kernel/building.md
https://wiki.osdev.org/Why_do_I_need_a_Cross_Compiler%3F
https://wiki.osdev.org/GCC_Cross-Compiler
https://wiki.osdev.org/Building_GCC