From 121ed4eec41fbf03e1998d09eede1bf449da63b9 Mon Sep 17 00:00:00 2001 From: V3n3RiX Date: Fri, 19 Jul 2019 22:05:27 +0100 Subject: gentoo resync : 19.07.2019 --- eclass/usr-ldscript.eclass | 163 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 eclass/usr-ldscript.eclass (limited to 'eclass/usr-ldscript.eclass') diff --git a/eclass/usr-ldscript.eclass b/eclass/usr-ldscript.eclass new file mode 100644 index 000000000000..7e406267b644 --- /dev/null +++ b/eclass/usr-ldscript.eclass @@ -0,0 +1,163 @@ +# Copyright 2019 Gentoo Authors +# Distributed under the terms of the GNU General Public License v2 + +# @ECLASS: usr-ldscript.eclass +# @MAINTAINER: +# Toolchain Ninjas +# @SUPPORTED_EAPIS: 4 5 6 7 +# @BLURB: Defines the gen_usr_ldscript function. + +if [[ -z ${_USR_LDSCRIPT_ECLASS} ]]; then +_USR_LDSCRIPT_ECLASS=1 + +case ${EAPI:-0} in + 4|5|6|7) ;; + *) die "EAPI=${EAPI} is not supported" ;; +esac + +inherit multilib toolchain-funcs + +IUSE="split-usr" + +# @FUNCTION: gen_usr_ldscript +# @USAGE: [-a] +# @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 + + # 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 prefix && return 0 + 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 -- cgit v1.2.3