summaryrefslogtreecommitdiff
blob: 9f7a8e3296f0d60fa1caf213cd23722be661f8d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: kernel-build.eclass
# @MAINTAINER:
# Distribution Kernel Project <dist-kernel@gentoo.org>
# @AUTHOR:
# Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Build mechanics for Distribution Kernels
# @DESCRIPTION:
# This eclass provides the logic to build a Distribution Kernel from
# source and install it.  Post-install and test logic is inherited
# from kernel-install.eclass.
#
# The ebuild must take care of unpacking the kernel sources, copying
# an appropriate .config into them (e.g. in src_prepare()) and setting
# correct S.  The eclass takes care of respecting savedconfig, building
# the kernel and installing it along with its modules and subset
# of sources needed to build external modules.

if [[ ! ${_KERNEL_BUILD_ECLASS} ]]; then

case "${EAPI:-0}" in
	0|1|2|3|4|5|6)
		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
		;;
	7)
		;;
	*)
		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
		;;
esac

inherit savedconfig toolchain-funcs kernel-install

BDEPEND="
	sys-devel/bc
	sys-devel/flex
	virtual/libelf
	virtual/yacc"

# @FUNCTION: kernel-build_src_configure
# @DESCRIPTION:
# Prepare the toolchain for building the kernel, get the default .config
# or restore savedconfig, and get build tree configured for modprep.
kernel-build_src_configure() {
	debug-print-function ${FUNCNAME} "${@}"

	# force ld.bfd if we can find it easily
	local LD="$(tc-getLD)"
	if type -P "${LD}.bfd" &>/dev/null; then
		LD+=.bfd
	fi

	tc-export_build_env
	MAKEARGS=(
		V=1

		HOSTCC="$(tc-getBUILD_CC)"
		HOSTCXX="$(tc-getBUILD_CXX)"
		HOSTCFLAGS="${BUILD_CFLAGS}"
		HOSTLDFLAGS="${BUILD_LDFLAGS}"

		CROSS_COMPILE=${CHOST}-
		AS="$(tc-getAS)"
		CC="$(tc-getCC)"
		LD="${LD}"
		AR="$(tc-getAR)"
		NM="$(tc-getNM)"
		STRIP=":"
		OBJCOPY="$(tc-getOBJCOPY)"
		OBJDUMP="$(tc-getOBJDUMP)"

		# we need to pass it to override colliding Gentoo envvar
		ARCH=$(tc-arch-kernel)
	)

	restore_config .config
	[[ -f .config ]] || die "Ebuild error: please copy default config into .config"

	if [[ -z "${KV_LOCALVERSION}" ]]; then
		KV_LOCALVERSION=$(sed -n -e 's#^CONFIG_LOCALVERSION="\(.*\)"$#\1#p' \
			.config)
	fi

	mkdir -p "${WORKDIR}"/modprep || die
	mv .config "${WORKDIR}"/modprep/ || die
	emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" olddefconfig
	emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" modules_prepare
	cp -pR "${WORKDIR}"/modprep "${WORKDIR}"/build || die
}

# @FUNCTION: kernel-build_src_compile
# @DESCRIPTION:
# Compile the kernel sources.
kernel-build_src_compile() {
	debug-print-function ${FUNCNAME} "${@}"

	emake O="${WORKDIR}"/build "${MAKEARGS[@]}" all
}

# @FUNCTION: kernel-build_src_test
# @DESCRIPTION:
# Test the built kernel via qemu.  This just wraps the logic
# from kernel-install.eclass with the correct paths.
kernel-build_src_test() {
	debug-print-function ${FUNCNAME} "${@}"
	local targets=( modules_install )
	# on arm or arm64 you also need dtb
	if use arm || use arm64; then
		targets+=( dtbs_install )
	fi

	emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
		INSTALL_MOD_PATH="${T}" INSTALL_PATH="${ED}/boot"  "${targets[@]}"

	local ver="${PV}${KV_LOCALVERSION}"
	kernel-install_test "${ver}" \
		"${WORKDIR}/build/$(kernel-install_get_image_path)" \
		"${T}/lib/modules/${ver}"
}

# @FUNCTION: kernel-build_src_install
# @DESCRIPTION:
# Install the built kernel along with subset of sources
# into /usr/src/linux-${PV}.  Install the modules.  Save the config.
kernel-build_src_install() {
	debug-print-function ${FUNCNAME} "${@}"

	# do not use 'make install' as it behaves differently based
	# on what kind of installkernel is installed
	local targets=( modules_install )
	# on arm or arm64 you also need dtb
	if use arm || use arm64; then
		targets+=( dtbs_install )
	fi

	emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
		INSTALL_MOD_PATH="${ED}" INSTALL_PATH="${ED}/boot" "${targets[@]}"

	# note: we're using mv rather than doins to save space and time
	# install main and arch-specific headers first, and scripts
	local kern_arch=$(tc-arch-kernel)
	local ver="${PV}${KV_LOCALVERSION}"
	dodir "/usr/src/linux-${ver}/arch/${kern_arch}"
	mv include scripts "${ED}/usr/src/linux-${ver}/" || die
	mv "arch/${kern_arch}/include" \
		"${ED}/usr/src/linux-${ver}/arch/${kern_arch}/" || die

	# remove everything but Makefile* and Kconfig*
	find -type f '!' '(' -name 'Makefile*' -o -name 'Kconfig*' ')' \
		-delete || die
	find -type l -delete || die
	cp -p -R * "${ED}/usr/src/linux-${ver}/" || die

	cd "${WORKDIR}" || die
	# strip out-of-source build stuffs from modprep
	# and then copy built files as well
	find modprep -type f '(' \
			-name Makefile -o \
			-name '*.[ao]' -o \
			'(' -name '.*' -a -not -name '.config' ')' \
		')' -delete || die
	rm modprep/source || die
	cp -p -R modprep/. "${ED}/usr/src/linux-${ver}"/ || die

	# install the kernel and files needed for module builds
	insinto "/usr/src/linux-${ver}"
	doins build/{System.map,Module.symvers}
	local image_path=$(kernel-install_get_image_path)
	cp -p "build/${image_path}" "${ED}/usr/src/linux-${ver}/${image_path}" || die

	# strip empty directories
	find "${D}" -type d -empty -exec rmdir {} + || die

	# fix source tree and build dir symlinks
	dosym ../../../usr/src/linux-${ver} /lib/modules/${ver}/build
	dosym ../../../usr/src/linux-${ver} /lib/modules/${ver}/source

	save_config build/.config
}

# @FUNCTION: kernel-build_pkg_postinst
# @DESCRIPTION:
# Combine postinst from kernel-install and savedconfig eclasses.
kernel-build_pkg_postinst() {
	kernel-install_pkg_postinst
	savedconfig_pkg_postinst
}

_KERNEL_BUILD_ECLASS=1
fi

EXPORT_FUNCTIONS src_configure src_compile src_test src_install pkg_postinst