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List: gentoo-dev
Subject: [gentoo-dev] [PATCH 01/21] sep-usr.eclass: new eclass to hold gen_usr_ldscript and related logic #41
From: Mike Frysinger <vapier () gentoo ! org>
Date: 2016-03-30 23:58:20
Message-ID: 1459382320-20672-2-git-send-email-vapier () gentoo ! org
[Download RAW message or body]
This is mostly a copy of the func as it exists in the toolchain-funcs
eclass, but with some of the initial logic shifted to USE=sep-usr.
Once all ebuilds have switched over to this eclass, we can drop it
from the toolchain-funcs eclass. In the meantime, make sure this is
inherited last.
---
eclass/sep-usr.eclass | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++
profiles/use.desc | 1 +
2 files changed, 153 insertions(+)
create mode 100644 eclass/sep-usr.eclass
diff --git a/eclass/sep-usr.eclass b/eclass/sep-usr.eclass
new file mode 100644
index 0000000..c6791e1
--- /dev/null
+++ b/eclass/sep-usr.eclass
@@ -0,0 +1,152 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: sep-usr.eclass
+# @MAINTAINER:
+# Toolchain Ninjas <toolchain@gentoo.org>
+# @BLURB: functions to support a split /usr partition
+# @DESCRIPTION:
+# Some core packages might install extra files into / instead of /usr when
+# the expectation is that /usr is a separate mount point. This eclass holds
+# various functions to simplify that process for ebuild writers.
+
+if [[ -z ${_SEP_USR_ECLASS} ]]; then
+_SEP_USR_ECLASS=1
+
+inherit multilib
+
+IUSE="sep-usr"
+
+# @FUNCTION: gen_usr_ldscript
+# @USAGE: [-a] <list of libs to create linker scripts for>
+# @DESCRIPTION:
+# This function generate linker scripts in /usr/lib for dynamic
+# libs in /lib. This is to fix linking problems when you have
+# the .so in /lib, and the .a in /usr/lib. What happens is that
+# in some cases when linking dynamic, the .a in /usr/lib is used
+# instead of the .so in /lib due to gcc/libtool tweaking ld's
+# library search path. This causes many builds to fail.
+# See bug #4411 for more info.
+#
+# Note that you should in general use the unversioned name of
+# the library (libfoo.so), as ldconfig should usually update it
+# correctly to point to the latest version of the library present.
+gen_usr_ldscript() {
+ local lib libdir=$(get_libdir) output_format="" auto=false suffix=$(get_libname)
+ [[ -z ${ED+set} ]] && local ED=${D%/}${EPREFIX}/
+
+ # This code only matters when it's been enabled. #417451
+ use sep-usr || return 0
+
+ # We only care about stuffing / for the native ABI. #479448
+ if [[ $(type -t multilib_is_native_abi) == "function" ]] ; then
+ multilib_is_native_abi || return 0
+ fi
+
+ # Just make sure it exists
+ dodir /usr/${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
diff --git a/profiles/use.desc b/profiles/use.desc
index 6acf19f..6297fee 100644
--- a/profiles/use.desc
+++ b/profiles/use.desc
@@ -299,6 +299,7 @@ seamonkey - Add support for the Seamonkey web-browser
seccomp - Enable seccomp (secure computing mode) to perform system call filtering at \
runtime to increase security of programs selinux - !!internal use only!! Security \
Enhanced Linux support, this must be set by the selinux profile or breakage will \
occur semantic-desktop - Cross-KDE support for semantic search and information \
retrieval +sep-usr - Install some critical files into / instead of /usr (for when \
/usr is a separate mount point) session - Add persistent session support
sharedmem - Add support for shared memory use
shorten - Add support for the shorten audio compressor
--
2.7.4
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