# Reference: <https://postmarketos.org/vendorkernel>
# Kernel config based on: arch/arm64/configs/aeon6797_6m_n_halium_defconfig

pkgname="linux-planet-geminipda"
pkgver=3.18.41
pkgrel=0
pkgdesc="Gemini PDA kernel fork"
arch="aarch64"
_carch="arm64"
_flavor="planet-geminipda"
url="https://kernel.org"
license="GPL-2.0-only"
options="!strip !check !tracedeps"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev devicepkg-dev gcc6 python"

# Compiler: GCC 6 (doesn't boot when compiled with newer versions)
if [ "${CC:0:5}" != "gcc6-" ]; then
	CC="gcc6-$CC"
	HOSTCC="gcc6-gcc"
	CROSS_COMPILE="gcc6-$CROSS_COMPILE"
fi

# Source
_repository="gemini-linux-kernel-3.18"
_commit="bf7daa4483d5dce94c9d478fc28854f5978d60da"
_config="config-${_flavor}.${arch}"
source="
	$pkgname-$_commit.tar.gz::https://github.com/gemian/${_repository}/archive/${_commit}.tar.gz
	$_config
"
builddir="$srcdir/${_repository}-${_commit}"

prepare() {
	default_prepare

	# support newer GCC versions
	cp -v "/usr/share/devicepkg-dev/compiler-gcc.h" "$builddir/include/linux/"

	# Remove -Werror from all makefiles
	makefiles="$(find "$builddir" -type f -name Makefile)
		$(find "$builddir" -type f -name Kbuild)"
	for i in $makefiles; do
		sed -i 's/-Werror-/-W/g' "$i"
		sed -i 's/-Werror//g' "$i"
	done

	# Device kernel must(!) be build out-of-tree to avoid include errors
	mkdir -p "$builddir"/KERNEL_OBJ

	# Prepare kernel config ('yes ""' for kernels lacking olddefconfig)
	cp "$srcdir"/$_config "$builddir"/KERNEL_OBJ/.config
	yes "" | make -C "$builddir" ARCH="$_carch" HOSTCC="$HOSTCC" \
		O="$builddir"/KERNEL_OBJ oldconfig
}

build() {
	unset LDFLAGS
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS" \
		O="$builddir"/KERNEL_OBJ
}

package() {
	# kernel.release
	install -D "$builddir/KERNEL_OBJ/include/config/kernel.release" \
		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"

	# zImage (find the right one)
	cd "$builddir/KERNEL_OBJ/arch/$_carch/boot"
	_target="$pkgdir/boot/vmlinuz-$_flavor"
	for _zimg in zImage-dtb Image.gz-dtb *zImage Image; do
		[ -e "$_zimg" ] || continue
		msg "zImage found: $_zimg"
		install -Dm644 "$_zimg" "$_target"
		break
	done
	if ! [ -e "$_target" ]; then
		error "Could not find zImage in $PWD!"
		return 1
	fi
}

sha512sums="84579ba59ada9166794ec02843616049128c199f9c68b519d3e33056822a22d12921b6589ff058d08e580e877a227a124f999f041e29b6d81a8fde7ce7480b11  linux-planet-geminipda-bf7daa4483d5dce94c9d478fc28854f5978d60da.tar.gz
019e2cb30c6d61b37c5c6c5f583da5be42e37bb7eb695bba4dc30dfe91196d3f20ba57ae3ac6931f9ea4cbf4a7c2cdd95f603191e387c3e292b667049a4e9876  config-planet-geminipda.aarch64"