If you using archlinux then want to compile arm kernel then you need a arm-linux-gnueabi. The packages is available on AUR. To install packages from AUR, you can follow the steps on this post. Install from AUR
Done, and how to use it. For example you are in arm kernel source root tree. If you want to open menuconfig. make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig