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240 lines
7.0 KiB
240 lines
7.0 KiB
# Copyright 2020-2021 Gentoo Authors
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# Distributed under the terms of the GNU General Public License v2
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# @ECLASS: kernel-build.eclass
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# @MAINTAINER:
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# Distribution Kernel Project <dist-kernel@gentoo.org>
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# @AUTHOR:
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# Michał Górny <mgorny@gentoo.org>
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# @SUPPORTED_EAPIS: 7
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# @BLURB: Build mechanics for Distribution Kernels
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# @DESCRIPTION:
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# This eclass provides the logic to build a Distribution Kernel from
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# source and install it. Post-install and test logic is inherited
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# from kernel-install.eclass.
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#
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# The ebuild must take care of unpacking the kernel sources, copying
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# an appropriate .config into them (e.g. in src_prepare()) and setting
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# correct S. The eclass takes care of respecting savedconfig, building
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# the kernel and installing it along with its modules and subset
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# of sources needed to build external modules.
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if [[ ! ${_KERNEL_BUILD_ECLASS} ]]; then
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case "${EAPI:-0}" in
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0|1|2|3|4|5|6)
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die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
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;;
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7)
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;;
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*)
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die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
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;;
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esac
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PYTHON_COMPAT=( python3_{8..10} )
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inherit python-any-r1 savedconfig toolchain-funcs kernel-install
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BDEPEND="
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${PYTHON_DEPS}
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app-arch/cpio
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sys-devel/bc
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sys-devel/flex
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virtual/libelf
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virtual/yacc"
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# @FUNCTION: kernel-build_src_configure
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# @DESCRIPTION:
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# Prepare the toolchain for building the kernel, get the default .config
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# or restore savedconfig, and get build tree configured for modprep.
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kernel-build_src_configure() {
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debug-print-function ${FUNCNAME} "${@}"
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# force ld.bfd if we can find it easily
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local LD="$(tc-getLD)"
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if type -P "${LD}.bfd" &>/dev/null; then
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LD+=.bfd
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fi
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tc-export_build_env
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MAKEARGS=(
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V=1
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HOSTCC="$(tc-getBUILD_CC)"
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HOSTCXX="$(tc-getBUILD_CXX)"
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HOSTCFLAGS="${BUILD_CFLAGS}"
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HOSTLDFLAGS="${BUILD_LDFLAGS}"
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CROSS_COMPILE=${CHOST}-
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AS="$(tc-getAS)"
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CC="$(tc-getCC)"
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LD="${LD}"
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AR="$(tc-getAR)"
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NM="$(tc-getNM)"
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STRIP=":"
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OBJCOPY="$(tc-getOBJCOPY)"
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OBJDUMP="$(tc-getOBJDUMP)"
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# we need to pass it to override colliding Gentoo envvar
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ARCH=$(tc-arch-kernel)
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)
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restore_config .config
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[[ -f .config ]] || die "Ebuild error: please copy default config into .config"
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if [[ -z "${KV_LOCALVERSION}" ]]; then
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KV_LOCALVERSION=$(sed -n -e 's#^CONFIG_LOCALVERSION="\(.*\)"$#\1#p' \
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.config)
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fi
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mkdir -p "${WORKDIR}"/modprep || die
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mv .config "${WORKDIR}"/modprep/ || die
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emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" olddefconfig
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emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" modules_prepare
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cp -pR "${WORKDIR}"/modprep "${WORKDIR}"/build || die
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}
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# @FUNCTION: kernel-build_src_compile
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# @DESCRIPTION:
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# Compile the kernel sources.
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kernel-build_src_compile() {
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debug-print-function ${FUNCNAME} "${@}"
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emake O="${WORKDIR}"/build "${MAKEARGS[@]}" all
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}
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# @FUNCTION: kernel-build_src_test
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# @DESCRIPTION:
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# Test the built kernel via qemu. This just wraps the logic
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# from kernel-install.eclass with the correct paths.
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kernel-build_src_test() {
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debug-print-function ${FUNCNAME} "${@}"
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local targets=( modules_install )
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# on arm or arm64 you also need dtb
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if use arm || use arm64; then
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targets+=( dtbs_install )
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fi
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emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
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INSTALL_MOD_PATH="${T}" "${targets[@]}"
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local ver="${PV}${KV_LOCALVERSION}"
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kernel-install_test "${ver}" \
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"${WORKDIR}/build/$(dist-kernel_get_image_path)" \
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"${T}/lib/modules/${ver}"
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}
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# @FUNCTION: kernel-build_src_install
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# @DESCRIPTION:
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# Install the built kernel along with subset of sources
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# into /usr/src/linux-${PV}. Install the modules. Save the config.
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kernel-build_src_install() {
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debug-print-function ${FUNCNAME} "${@}"
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# do not use 'make install' as it behaves differently based
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# on what kind of installkernel is installed
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local targets=( modules_install )
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# on arm or arm64 you also need dtb
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if use arm || use arm64; then
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targets+=( dtbs_install )
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fi
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emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
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INSTALL_MOD_PATH="${ED}" INSTALL_PATH="${ED}/boot" "${targets[@]}"
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# note: we're using mv rather than doins to save space and time
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# install main and arch-specific headers first, and scripts
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local kern_arch=$(tc-arch-kernel)
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local ver="${PV}${KV_LOCALVERSION}"
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dodir "/usr/src/linux-${ver}/arch/${kern_arch}"
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mv include scripts "${ED}/usr/src/linux-${ver}/" || die
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mv "arch/${kern_arch}/include" \
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"${ED}/usr/src/linux-${ver}/arch/${kern_arch}/" || die
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# some arches need module.lds linker script to build external modules
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if [[ -f arch/${kern_arch}/kernel/module.lds ]]; then
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insinto "/usr/src/linux-${ver}/arch/${kern_arch}/kernel"
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doins "arch/${kern_arch}/kernel/module.lds"
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fi
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# remove everything but Makefile* and Kconfig*
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find -type f '!' '(' -name 'Makefile*' -o -name 'Kconfig*' ')' \
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-delete || die
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find -type l -delete || die
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cp -p -R * "${ED}/usr/src/linux-${ver}/" || die
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cd "${WORKDIR}" || die
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# strip out-of-source build stuffs from modprep
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# and then copy built files as well
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find modprep -type f '(' \
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-name Makefile -o \
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-name '*.[ao]' -o \
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'(' -name '.*' -a -not -name '.config' ')' \
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')' -delete || die
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rm modprep/source || die
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cp -p -R modprep/. "${ED}/usr/src/linux-${ver}"/ || die
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# install the kernel and files needed for module builds
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insinto "/usr/src/linux-${ver}"
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doins build/{System.map,Module.symvers}
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local image_path=$(dist-kernel_get_image_path)
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cp -p "build/${image_path}" "${ED}/usr/src/linux-${ver}/${image_path}" || die
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# building modules fails with 'vmlinux has no symtab?' if stripped
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use ppc64 && dostrip -x "/usr/src/linux-${ver}/${image_path}"
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# strip empty directories
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find "${D}" -type d -empty -exec rmdir {} + || die
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# fix source tree and build dir symlinks
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dosym ../../../usr/src/linux-${ver} /lib/modules/${ver}/build
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dosym ../../../usr/src/linux-${ver} /lib/modules/${ver}/source
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save_config build/.config
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}
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# @FUNCTION: kernel-build_pkg_postinst
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# @DESCRIPTION:
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# Combine postinst from kernel-install and savedconfig eclasses.
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kernel-build_pkg_postinst() {
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kernel-install_pkg_postinst
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savedconfig_pkg_postinst
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}
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# @FUNCTION: kernel-build_merge_configs
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# @USAGE: [distro.config...]
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# @DESCRIPTION:
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# Merge the config files specified as arguments (if any) into
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# the '.config' file in the current directory, then merge
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# any user-supplied configs from ${BROOT}/etc/kernel/config.d/*.config.
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# The '.config' file must exist already and contain the base
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# configuration.
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kernel-build_merge_configs() {
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debug-print-function ${FUNCNAME} "${@}"
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[[ -f .config ]] || die "${FUNCNAME}: .config does not exist"
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has .config "${@}" &&
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die "${FUNCNAME}: do not specify .config as parameter"
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local shopt_save=$(shopt -p nullglob)
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shopt -s nullglob
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local user_configs=( "${BROOT}"/etc/kernel/config.d/*.config )
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shopt -u nullglob
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if [[ ${#user_configs[@]} -gt 0 ]]; then
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elog "User config files are being applied:"
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local x
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for x in "${user_configs[@]}"; do
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elog "- ${x}"
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done
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fi
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./scripts/kconfig/merge_config.sh -m -r \
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.config "${@}" "${user_configs[@]}" || die
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}
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_KERNEL_BUILD_ECLASS=1
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fi
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EXPORT_FUNCTIONS src_configure src_compile src_test src_install pkg_postinst
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