add scripts/diffconfig.sh: a tool for making reduced .config files

these files contain only the target selection and options that differ from the default settings
this makes it much easier to review .config files

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25231 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/scripts/diffconfig.sh b/scripts/diffconfig.sh
new file mode 100755 (executable)
index 0000000..1f52585
--- /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