void-packages/common/hooks/post-install/80-prepare-32bit.sh

# This hook creates a new PKGDESTDIR with 32bit files for x86_64.
#
# Variables that can be used in templates:
#	- lib32depends: if set, 32bit pkg will use this rather than "depends".
#	- lib32disabled: if set, no 32bit pkg will be created.
#	- lib32files: additional files to add to the 32bit pkg (abs paths, separated by blanks).
#	- lib32symlinks: makes a symlink from lib32 to lib of the specified file (basename).
#	- lib32mode:
#		* if unset only files for libraries will be copied.
#		* if set to "full" all files will be copied.

hook() {
	local destdir32=${XBPS_DESTDIR}/${pkgname}-32bit-${version}

	# By default always enabled unless "lib32disabled" is set.
	if [ -n "$lib32disabled" ]; then
		return
	fi
	# This hook will only work when building for x86.
	if [ "$XBPS_TARGET_MACHINE" != "i686" ]; then
		return
	fi
	if [ -z "$lib32mode" ]; then
		# Library mode, copy only relevant files to new destdir.
		#
		# If /usr/lib does not exist don't continue...
		# except for devel packages, for which empty 32bit package will be created
		if ! [ -d ${PKGDESTDIR}/usr/lib ] && ! [[ ${pkgname} == *-devel ]]; then
			return
		fi

		mkdir -p ${destdir32}/usr/lib32
		if [ -d ${PKGDESTDIR}/usr/lib ]; then
			cp -a ${PKGDESTDIR}/usr/lib/* ${destdir32}/usr/lib32
		fi

		# Only keep shared libs, static libs, and pkg-config files.
		find "${destdir32}" -not \( \
			-name '*.pc' -or \
			-name '*.so' -or \
			-name '*.so.*' -or \
			-name '*.a' -or \
			-name '*.la' -or \
			-name '*.o' -or \
			-type d \
		\) -delete

		# Remove empty dirs.
		while IFS= read -r -d '' f; do
			_dir="${f##${destdir32}}"
			[ -z "${_dir}" ] && continue
			rmdir --ignore-fail-on-non-empty -p "$f" &>/dev/null
		done < <(find ${destdir32} -type d -empty -print0 | sort -uz)

		# Switch pkg-config files to lib32.
		if [ -d ${destdir32}/usr/lib32/pkgconfig ]; then
			sed -e 's,/usr/lib$,/usr/lib32,g' \
			    -e 's,${exec_prefix}/lib$,${exec_prefix}/lib32,g' \
			    -i ${destdir32}/usr/lib32/pkgconfig/*.pc
		fi
	elif [ "$lib32mode" = "full" ]; then
		# Full 32bit mode; copy everything to new destdir.
		mkdir -p ${destdir32}
		cp -a ${PKGDESTDIR}/. ${destdir32}/
		# remove symlink
		if [ -h ${destdir32}/usr/lib32 ]; then
			rm ${destdir32}/usr/lib32
		fi
		# if /usr/lib dir exists move it to lib32.
		if [ -d ${destdir32}/usr/lib ]; then
			mv ${destdir32}/usr/lib ${destdir32}/usr/lib32
		fi
	fi
	if [[ ${pkgname} == *-devel ]]; then
		mkdir -p ${destdir32}
	fi

	if [ ! -d ${destdir32} ]; then
		return
	fi

	# Also install additional files set via "lib32files".
	for f in ${lib32files}; do
		echo "$pkgver: installing additional files: $f ..."
		_targetdir=${destdir32}/${f%/*}/
		mkdir -p ${_targetdir/\/usr\/lib/\/usr\/lib32}
		cp -a ${PKGDESTDIR}/${f} ${_targetdir/\/usr\/lib/\/usr\/lib32}
	done

	# Additional symlinks to the native libdir.
	for f in ${lib32symlinks}; do
		echo "$pkgver: symlinking $f to the native libdir..."
		if [ "${f%/*}" != "${f}" ]; then
			mkdir -p ${destdir32}/usr/lib{,32}/${f%/*}/
		else
			mkdir -p ${destdir32}/usr/lib{,32}/
		fi
		ln -sfr ${destdir32}/usr/lib32/$f ${destdir32}/usr/lib/$f
	done
}