backport scripts/diffconfig.sh from trunk

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@26171 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/scripts/diffconfig.sh b/scripts/diffconfig.sh
new file mode 100755 (executable)
index 0000000..e1d605d
--- /dev/null
+++ b/scripts/diffconfig.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+grep \^CONFIG_TARGET_ .config | head -n3 > tmp/.diffconfig.head
+./scripts/config/conf -D tmp/.diffconfig.head -w tmp/.diffconfig.stage1 Config.in >/dev/null
+./scripts/kconfig.pl '>+' tmp/.diffconfig.stage1 .config >> tmp/.diffconfig.head
+./scripts/config/conf -D tmp/.diffconfig.head -w tmp/.diffconfig.stage2 Config.in >/dev/null
+./scripts/kconfig.pl '>' tmp/.diffconfig.stage2 .config >> tmp/.diffconfig.head
+cat tmp/.diffconfig.head
+rm -f tmp/.diffconfig tmp/.diffconfig.head