#!/bin/sh

#
# Yoink
# Run this script to link the executable with fewer direct dependencies.
#
# You shouldn't call this directly; instead, use the configure script's
# --enable-link-sh option and run make normally.  This isn't enabled by
# default because there is the potential for runtime linking problems on
# some platforms.  If you have a newer version of GCC, you should prefer
# the --as-needed linker flag over this method, though they both should
# accomplish the same thing.
#
# This script was adapted from some public domain code written by Bram
# Moolenaar for Vim.  The only input needed is the link command in the
# variable LINK.  It is expected that the linker will return an error code
# or this will not work.  The script caches the test results in the
# `.link/link.sed' file; delete that file if you want to redetermine the
# required direct dependencies.
#


# List here any libraries that are known to not be needed on some platform.
libraries="\
	atk-1.0 \
	cairo \
	fontconfig \
	freetype \
	gdk-x11-2.0 \
	gio-2.0 \
	glib-2.0 \
	gmodule-2.0 \
	ogg \
	pango-1.0 \
	pangocairo-1.0 \
	pangoft2-1.0 \
	pthread \
	vorbis \
	$THE_END"


linkdir=".link"
logfile="$linkdir/link.log"
sedfile="$linkdir/link.sed"

workdir=$(mktemp -d tmp.XXXXXXXX)
cmdfile="$workdir/link.cmd"
runfile="$workdir/link.run"

tmpfile1="$workdir/link.tmp1"
tmpfile2="$workdir/link.tmp2"
tmpfile3="$workdir/link.tmp3"


printlog()
{
	echo "link.sh: $@"
}

echo "$LINK " >$cmdfile
exitcode=0


if test -f $sedfile
then
	printlog "The file $sedfile exists, which is now going to be used."
	printlog "If linking fails, try deleting the $sedfile file."
	printlog "If that fails, try creating an empty $sedfile file."
	printlog "If that fails, configure the package with --disable-link-sh."
else
	cat $cmdfile
	if sh $cmdfile
	then
		mkdir -p $linkdir
		touch $sedfile
		cp $cmdfile $runfile
		for libname in $libraries
		do
			cont=yes
			while test -n "$cont"
			do
				if grep "l$libname " $runfile >/dev/null
				then
					if test ! -f $tmpfile1
					then
						printlog "Full linking works; now the fun begins."
						printlog "See $logfile for details."
						rm -f $logfile
					fi
					echo "s/-l$libname  *//" >$tmpfile1
					sed -f $sedfile <$cmdfile | sed -f $tmpfile1 >$runfile
					# keep the last -lm; this is supposedly needed by HP-UX
					if test $libname != "m" || grep "lm " $runfile >/dev/null
					then
						printlog "Trying to remove the $libname library..."
						cat $runfile >>$logfile
						if sh $runfile >>$logfile 2>&1
						then
							printlog "We don't need the $libname library!"
							cat $tmpfile1 >>$sedfile
							continue
						else
							printlog "We DO need the $libname library."
						fi
					fi
				fi
				cont=
				cp $cmdfile $runfile
			done
		done
		if test ! -f $tmpfile1
		then
			printlog "Linked fine, no libraries can be removed."
			touch $tmpfile3
		fi
	else
		exitcode=$?
	fi
fi


if test -s $sedfile
then
	printlog "Using $sedfile file to remove a few libraries."
	sed -f $sedfile <$cmdfile >$runfile
	cat $runfile
	if sh $runfile
	then
		exitcode=0
		printlog "Linked fine with a few libraries removed."
	else
		exitcode=$?
		printlog "Linking failed, making $sedfile empty and trying again."
		mv -f $sedfile $tmpfile2
		touch $sedfile
	fi
fi

if test -f $sedfile -a ! -s $sedfile -a ! -f $tmpfile3
then
	printlog "Using unmodified link command."
	cat $cmdfile
	if sh $cmdfile
	then
		exitcode=0
		printlog "Linked OK."
	else
		exitcode=$?
		if test -f $tmpfile2
		then
			printlog "Linking doesn't work at all, removing $sedfile."
			rm -f $sedfile
		fi
	fi
fi


rm -rf "$workdir"
exit $exitcode