modules += linux

linux_version := 4.9
linux_dir := linux-$(linux_version)
linux_tar := linux-$(linux_version).tar.xz
linux_url := https://cdn.kernel.org/pub/linux/kernel/v4.x/$(linux_tar)

linux-4.6.4_hash := 8568d41c7104e941989b14a380d167129f83db42c04e950d8d9337fe6012ff7e
linux-4.7_hash := 5190c3d1209aeda04168145bf50569dc0984f80467159b1dc50ad731e3285f10
linux-4.9_hash := 029098dcffab74875e086ae970e3828456838da6e0ba22ce3f64ef764f3d7f1a

linux_hash := $(linux-$(linux_version)_hash)

linux_configure := \
	$(MAKE) \
		CROSS_COMPILE=$(pwd)/crossgcc/x86_64-linux-musl/bin/x86_64-linux-musl- \
		oldconfig \

linux_output := arch/x86/boot/bzImage
linux_config := linux.config

EXTRA_FLAGS := -fdebug-prefix-map=$(pwd)=heads -gno-record-gcc-switches

linux_target := \
	CROSS_COMPILE=$(pwd)/crossgcc/x86_64-linux-musl/bin/x86_64-linux-musl- \
	AFLAGS_KERNEL="$(EXTRA_FLAGS)" \
	CFLAGS_KERNEL="$(EXTRA_FLAGS)" \
	CFLAGS_MODULE="$(EXTRA_FLAGS)" \
	KBUILD_BUILD_USER=user \
	KBUILD_BUILD_HOST=heads-build \
	KBUILD_BUILD_TIMESTAMP="1970-00-00" \
	KBUILD_BUILD_VERSION=0 \
	-j 8 \
	bzImage