kerndev-build

#!/bin/bash
set -e; set -o pipefail; source kerndev-shared.sh

# NOTE: $cross_compile_prefix will vary depending on your cross-compiler setup.

# If an argument is provided, it specifies a cross-compile target architecture.
target_arch=${1:-"x86_64"}

# Sanity checks.
check_linux_dev_path
[[ $EUID = 0 ]] && fatal "Don't run as root, causes file ownership pain"

case $target_arch in
arm)
	# Use aarch64 + backwards compatibility.
	;&
aarch64)
	linux_arch="arm64"
	cross_compile_prefix="aarch64-linux-gnu-"
	;;
"x86_64")
	;;
*)
	fatal "unknown architecture: $target_arch"
	;;
esac

if [[ "$target_arch" != "x86_64" ]]; then
	# Make sure we have cross-compilers. `gcc` check should suffice.
	check_exists ${cross_compile_prefix}gcc

	# For now, always force a rebuild.
	REBUILD=y
	make_opts="ARCH=${linux_arch} CROSS_COMPILE=$cross_compile_prefix"
fi

# Ref: http://stackoverflow.com/a/6481016
cores=$(grep -c ^processor /proc/cpuinfo)

push_linux

echo Configuring kernel...

source kerndev-config
# Set any new options implied by kerndev-config to default.
mak olddefconfig

echo Compiling kernel...
# 1 extra thread to account for I/O waiting.
mak -j$((cores + 1))

if [[ -z "$DONT_INSTALL" ]]; then
	NO_DONE=y sudo -E kerndev-install $target_arch
fi

pop

say_done