sde-build-tools: flwrapper: use ldd to decide FLWRAPPER_LIBC [WIP]

Signed-off-by: Alejandro Mery <amery@geeks.cl>

lib/sde-build/flist_flwrapper_tools.in

@@ -14,15 +14,23 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+flist_find_libc_so() {
+	# TODO: when is this criteria valid?
+	# $SHELL's libc
+	if ldd /proc/$$/exe | grep 'libc[.-]' |
+		sed -e 's:.* \(/[^ ]\+\) .*:\1:' | head -n1; then
+		return
+	fi
+
+	# TODO: scan "$xroot"/lib*/{*/,}libc[.-]*
+}
+
 flist_tools_clean() {
 	rm -f "$TOOLSDIR/lib/fl_wrapper.so"
 }
 
 flist_tools_build() {
-	FLWRAPPER_LIBC=$(ls -1 \
-		"$xroot"/lib*/{*/,}libc[.-]* 2> /dev/null |
-		grep -v '\.a$' | grep '\.so' |
-		sort -V | head -n1 )
+	FLWRAPPER_LIBC=$(flist_find_libc_so)
 
 	if [ ! -f "$FLWRAPPER_LIBC" ]; then
 		abort 'Unable to detect /lib/libc.* for flwrapper'