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# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: ltprune.eclass
# @MAINTAINER:
# Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 0 1 2 3 4 5 6
# @BLURB: Smart .la file pruning
# @DESCRIPTION:
# A function to locate and remove unnecessary .la files.
#
# Discouraged. Whenever possible, please use much simpler:
# @CODE
# find "${ED}" -name '*.la' -delete || die
# @CODE
if [[ -z ${_LTPRUNE_ECLASS} ]]; then
case ${EAPI:-0} in
0|1|2|3|4|5|6)
;;
*)
die "${ECLASS}: banned in EAPI=${EAPI}; use 'find' instead";;
esac
inherit toolchain-funcs
# @FUNCTION: prune_libtool_files
# @USAGE: [--all|--modules]
# @DESCRIPTION:
# Locate unnecessary libtool files (.la) and libtool static archives
# (.a) and remove them from installation image.
#
# By default, .la files are removed whenever the static linkage can
# either be performed using pkg-config or doesn't introduce additional
# flags.
#
# If '--modules' argument is passed, .la files for modules (plugins) are
# removed as well. This is usually useful when the package installs
# plugins and the plugin loader does not use .la files.
#
# If '--all' argument is passed, all .la files are removed without
# performing any heuristic on them. You shouldn't ever use that,
# and instead report a bug in the algorithm instead.
#
# The .a files are only removed whenever corresponding .la files state
# that they should not be linked to, i.e. whenever these files
# correspond to plugins.
#
# Note: if your package installs both static libraries and .pc files
# which use variable substitution for -l flags, you need to add
# pkg-config to your DEPEND.
prune_libtool_files() {
debug-print-function ${FUNCNAME} "$@"
local removing_all removing_modules opt
for opt; do
case "${opt}" in
--all)
removing_all=1
removing_modules=1
;;
--modules)
removing_modules=1
;;
*)
die "Invalid argument to ${FUNCNAME}(): ${opt}"
esac
done
local f
local queue=()
while IFS= read -r -d '' f; do # for all .la files
local archivefile=${f/%.la/.a}
# The following check is done by libtool itself.
# It helps us avoid removing random files which match '*.la',
# see bug #468380.
if ! sed -n -e '/^# Generated by .*libtool/q0;4q1' "${f}"; then
continue
fi
[[ ${f} != ${archivefile} ]] || die 'regex sanity check failed'
local reason= pkgconfig_scanned=
local snotlink=$(sed -n -e 's:^shouldnotlink=::p' "${f}")
if [[ ${snotlink} == yes ]]; then
# Remove static libs we're not supposed to link against.
if [[ -f ${archivefile} ]]; then
einfo "Removing unnecessary ${archivefile#${D%/}} (static plugin)"
queue+=( "${archivefile}" )
fi
# The .la file may be used by a module loader, so avoid removing it
# unless explicitly requested.
if [[ ${removing_modules} ]]; then
reason='module'
fi
else
# Remove .la files when:
# - user explicitly wants us to remove all .la files,
# - respective static archive doesn't exist,
# - they are covered by a .pc file already,
# - they don't provide any new information (no libs & no flags).
if [[ ${removing_all} ]]; then
reason='requested'
elif [[ ! -f ${archivefile} ]]; then
reason='no static archive'
elif [[ ! $(sed -nre \
"s/^(dependency_libs|inherited_linker_flags)='(.*)'$/\2/p" \
"${f}") ]]; then
reason='no libs & flags'
else
if [[ ! ${pkgconfig_scanned} ]]; then
# Create a list of all .pc-covered libs.
local pc_libs=()
if [[ ! ${removing_all} ]]; then
local pc
local tf=${T}/prune-lt-files.pc
local pkgconf=$(tc-getPKG_CONFIG)
while IFS= read -r -d '' pc; do # for all .pc files
local arg libs
# Use pkg-config if available (and works),
# fallback to sed.
if ${pkgconf} --exists "${pc}" &>/dev/null; then
sed -e '/^Requires:/d' "${pc}" > "${tf}"
libs=$(${pkgconf} --libs "${tf}")
else
libs=$(sed -ne 's/^Libs://p' "${pc}")
fi
for arg in ${libs}; do
if [[ ${arg} == -l* ]]; then
if [[ ${arg} == '*$*' ]]; then
eerror "${FUNCNAME}: variable substitution likely failed in ${pc}"
eerror "(arg: ${arg})"
eerror "Most likely, you need to add virtual/pkgconfig to DEPEND."
die "${FUNCNAME}: unsubstituted variable found in .pc"
fi
pc_libs+=( lib${arg#-l}.la )
fi
done
done < <(find "${D}" -type f -name '*.pc' -print0)
rm -f "${tf}"
fi
pkgconfig_scanned=1
fi # pkgconfig_scanned
has "${f##*/}" "${pc_libs[@]}" && reason='covered by .pc'
fi # removal due to .pc
fi # shouldnotlink==no
if [[ ${reason} ]]; then
einfo "Removing unnecessary ${f#${D%/}} (${reason})"
queue+=( "${f}" )
fi
done < <(find "${D}" -xtype f -name '*.la' -print0)
if [[ ${queue[@]} ]]; then
rm -f "${queue[@]}"
fi
}
_LTPRUNE_ECLASS=1
fi #_LTPRUNE_ECLASS
|
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