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#!/bin/sh
debug=false
try() {
added="$1"
shift
$debug && echo "Trying: $* $added"
"$@" $added >busybox.map 2>busybox_ld.err
}
# Sanitize lib list (dups, extra spaces etc)
#echo "BBOX_LIB_LIST=$BBOX_LIB_LIST"
BBOX_LIB_LIST=`echo "$BBOX_LIB_LIST" | xargs -n1 | sort | uniq | xargs`
# First link with all libs. If it fails, bail out
l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
echo "Trying libraries: $BBOX_LIB_LIST"
try "-Wl,--start-group $l_list -Wl,--end-group" "$@" \
|| {
echo "Failed: $* -Wl,--start-group $l_list -Wl,--end-group"
cat busybox_ld.err
exit 1
}
# Hack: we are not supposed to know executable name,
# but this hack cuts down link time
mv busybox_unstripped busybox_unstripped.tmp
mv busybox.map busybox.map.tmp
# Now try to remove each lib and build without it.
# Stop when no lib can be removed.
ever_discarded=false
while test "$BBOX_LIB_LIST"; do
$debug && echo "Trying libraries: $BBOX_LIB_LIST"
all_needed=true
for one in $BBOX_LIB_LIST; do
without_one=`echo " $BBOX_LIB_LIST " | sed "s/ $one / /g" | xargs`
l_list=`echo "$without_one" | sed -e 's/ / -l/g' -e 's/^/-l/'`
$debug && echo "Trying -l options: $l_list"
if try "-Wl,--start-group $l_list -Wl,--end-group" "$@"; then
echo "Library $one is not needed"
BBOX_LIB_LIST="$without_one"
all_needed=false
ever_discarded=true
else
echo "Library $one is needed"
fi
done
# All libs were needed, can't remove any
$all_needed && break
# If there is no space char, the list has just one lib.
# I'm not sure that in this case lib really is 100% needed.
# Let's try linking without it anyway... thus commented out.
#{ echo "$BBOX_LIB_LIST" | grep -q ' '; } || break
done
mv busybox_unstripped.tmp busybox_unstripped
mv busybox.map.tmp busybox.map
$ever_discarded && {
# Make the binary with final, minimal list of libs
echo "Final link with: $BBOX_LIB_LIST"
l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
try "-Wl,--start-group $l_list -Wl,--end-group" "$@" || exit 1
}
rm busybox_ld.err
exit 0 # Ensure "success" exit code
|
