summaryrefslogtreecommitdiff
blob: a8229ed2ac2e1533bafd65b9da45d35128034417 (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
# Copyright 2019-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: usr-ldscript.eclass
# @MAINTAINER:
# Toolchain Ninjas <toolchain@gentoo.org>
# @SUPPORTED_EAPIS: 6 7 8
# @BLURB: Defines the gen_usr_ldscript function.

case ${EAPI} in
	6|7|8) ;;
	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac

if [[ -z ${_USR_LDSCRIPT_ECLASS} ]]; then
_USR_LDSCRIPT_ECLASS=1

inherit multilib toolchain-funcs

IUSE="split-usr"

# @FUNCTION: gen_usr_ldscript
# @USAGE: [-a] <list of libs to create linker scripts for>
# @DESCRIPTION:
# This function generate linker scripts in /usr/lib for dynamic
# libs in /lib.  This is to fix linking problems when you have
# the .so in /lib, and the .a in /usr/lib.  What happens is that
# in some cases when linking dynamic, the .a in /usr/lib is used
# instead of the .so in /lib due to gcc/libtool tweaking ld's
# library search path.  This causes many builds to fail.
# See bug #4411 for more info.
#
# Note that you should in general use the unversioned name of
# the library (libfoo.so), as ldconfig should usually update it
# correctly to point to the latest version of the library present.
gen_usr_ldscript() {
	local lib libdir=$(get_libdir) output_format="" auto=false suffix=$(get_libname)

	tc-is-static-only && return
	use prefix && return

	# We only care about stuffing / for the native ABI. #479448
	if [[ $(type -t multilib_is_native_abi) == "function" ]] ; then
		multilib_is_native_abi || return 0
	fi

	# Eventually we'd like to get rid of this func completely #417451
	case ${CTARGET:-${CHOST}} in
	*-darwin*) ;;
	*-android*) return 0 ;;
	*linux*|*-freebsd*|*-openbsd*|*-netbsd*)
		use split-usr || return 0
		;;
	*) return 0 ;;
	esac

	# Just make sure it exists
	dodir /usr/${libdir}

	if [[ $1 == "-a" ]] ; then
		auto=true
		shift
		dodir /${libdir}
	fi

	# OUTPUT_FORMAT gives hints to the linker as to what binary format
	# is referenced ... makes multilib saner
	local flags=( ${CFLAGS} ${LDFLAGS} -Wl,--verbose )
	if $(tc-getLD) --version | grep -q 'GNU gold' ; then
		# If they're using gold, manually invoke the old bfd. #487696
		local d="${T}/bfd-linker"
		mkdir -p "${d}"
		ln -sf $(which ${CHOST}-ld.bfd) "${d}"/ld
		flags+=( -B"${d}" )
	fi
	output_format=$($(tc-getCC) "${flags[@]}" 2>&1 | sed -n 's/^OUTPUT_FORMAT("\([^"]*\)",.*/\1/p')
	[[ -n ${output_format} ]] && output_format="OUTPUT_FORMAT ( ${output_format} )"

	for lib in "$@" ; do
		local tlib
		if ${auto} ; then
			lib="lib${lib}${suffix}"
		else
			# Ensure /lib/${lib} exists to avoid dangling scripts/symlinks.
			# This especially is for AIX where $(get_libname) can return ".a",
			# so /lib/${lib} might be moved to /usr/lib/${lib} (by accident).
			[[ -r ${ED%/}/${libdir}/${lib} ]] || continue
			#TODO: better die here?
		fi

		case ${CTARGET:-${CHOST}} in
		*-darwin*)
			if ${auto} ; then
				tlib=$(scanmacho -qF'%S#F' "${ED%/}"/usr/${libdir}/${lib})
			else
				tlib=$(scanmacho -qF'%S#F' "${ED%/}"/${libdir}/${lib})
			fi
			[[ -z ${tlib} ]] && die "unable to read install_name from ${lib}"
			tlib=${tlib##*/}

			if ${auto} ; then
				mv "${ED%/}"/usr/${libdir}/${lib%${suffix}}.*${suffix#.} "${ED%/}"/${libdir}/ || die
				# some install_names are funky: they encode a version
				if [[ ${tlib} != ${lib%${suffix}}.*${suffix#.} ]] ; then
					mv "${ED%/}"/usr/${libdir}/${tlib%${suffix}}.*${suffix#.} "${ED%/}"/${libdir}/ || die
				fi
				rm -f "${ED%/}"/${libdir}/${lib}
			fi

			# Mach-O files have an id, which is like a soname, it tells how
			# another object linking against this lib should reference it.
			# Since we moved the lib from usr/lib into lib this reference is
			# wrong.  Hence, we update it here.  We don't configure with
			# libdir=/lib because that messes up libtool files.
			# Make sure we don't lose the specific version, so just modify the
			# existing install_name
			if [[ ! -w "${ED%/}/${libdir}/${tlib}" ]] ; then
				chmod u+w "${ED%/}/${libdir}/${tlib}" # needed to write to it
				local nowrite=yes
			fi
			install_name_tool \
				-id "${EPREFIX}"/${libdir}/${tlib} \
				"${ED%/}"/${libdir}/${tlib} || die "install_name_tool failed"
			[[ -n ${nowrite} ]] && chmod u-w "${ED%/}/${libdir}/${tlib}"
			# Now as we don't use GNU binutils and our linker doesn't
			# understand linker scripts, just create a symlink.
			pushd "${ED%/}/usr/${libdir}" > /dev/null
			ln -snf "../../${libdir}/${tlib}" "${lib}"
			popd > /dev/null
			;;
		*)
			if ${auto} ; then
				tlib=$(scanelf -qF'%S#F' "${ED%/}"/usr/${libdir}/${lib})
				[[ -z ${tlib} ]] && die "unable to read SONAME from ${lib}"
				mv "${ED%/}"/usr/${libdir}/${lib}* "${ED%/}"/${libdir}/ || die
				# some SONAMEs are funky: they encode a version before the .so
				if [[ ${tlib} != ${lib}* ]] ; then
					mv "${ED%/}"/usr/${libdir}/${tlib}* "${ED%/}"/${libdir}/ || die
				fi
				rm -f "${ED%/}"/${libdir}/${lib}
			else
				tlib=${lib}
			fi
			cat > "${ED%/}/usr/${libdir}/${lib}" <<-END_LDSCRIPT
			/* GNU ld script
			   Since Gentoo has critical dynamic libraries in /lib, and the static versions
			   in /usr/lib, we need to have a "fake" dynamic lib in /usr/lib, otherwise we
			   run into linking problems.  This "fake" dynamic lib is a linker script that
			   redirects the linker to the real lib.  And yes, this works in the cross-
			   compiling scenario as the sysroot-ed linker will prepend the real path.

			   See bug https://bugs.gentoo.org/4411 for more info.
			 */
			${output_format}
			GROUP ( ${EPREFIX}/${libdir}/${tlib} )
			END_LDSCRIPT
			;;
		esac
		fperms a+x "/usr/${libdir}/${lib}" || die "could not change perms on ${lib}"
	done
}

fi # _USR_LDSCRIPT_ECLASS