build: add checks for missing package dependencies

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@32185 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/gen-dependencies.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2012 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+SELF=${0##*/}
+
+READELF="${READELF:-readelf}"
+TARGETS=$*
+XARGS="${XARGS:-xargs -r}"
+
+[ -z "$TARGETS" ] && {
+  echo "$SELF: no directories / files specified"
+  echo "usage: $SELF [PATH...]"
+  exit 1
+}
+
+find $TARGETS -type f -a -exec file {} \; | \
+  sed -n -e 's/^\(.*\):.*ELF.*\(executable\|shared object\).*,.* stripped/\1/p' | \
+  $XARGS -n1 readelf -d | \
+  awk '$2 ~ /NEEDED/ && $NF !~ /interpreter/ { gsub(/[\[\]]/, "", $NF); print $NF }' | \
+  sort -u