make.sh: Add command to find dependencies

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

make.sh

@@ -1993,8 +1993,12 @@ lang)
 update-contributors)
 	update_contributors
 	;;
+find-dependencies)
+	shift
+	exec "${BASEDIR}/tools/find-dependencies" "${BASEDIR}/build" "$@"
+	;;
 *)
-	echo "Usage: $0 {build|changelog|clean|gettoolchain|downloadsrc|shell|sync|toolchain|update-contributors}"
+	echo "Usage: $0 {build|changelog|clean|gettoolchain|downloadsrc|shell|sync|toolchain|update-contributors|find-dependencies}"
 	cat doc/make.sh-usage
 	;;
 esac

tools/find-dependencies

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+main() {
+	if [ $# -lt 2 ]; then
+		echo "${0}: Usage: PATH LIBRARY ..."
+		return 2
+	fi
+
+	local root="${1}"
+	shift
+
+	if [ ! -d "${root}" ]; then
+		echo "${0}: ${root}: No such file or directory"
+		return 1
+	fi
+
+	local libraries="$@"
+
+	# Build the regex filter
+	local filter="(${libraries[*]// /|})"
+
+	local file
+	for file in $(find "${root}" -xdev -type f -executable); do
+		if readelf -d "${file}" 2>/dev/null | grep -qE "NEEDED.*\[${filter}\]$"; then
+			echo "${file}"
+		fi
+	done
+
+	return 0
+}
+
+main "$@" || exit $?