This simple shell-script tries to find *.c files under /sys

which are not in some way used or referenced somewhere.

tools/tools/kernelcruft/kernelcruft.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+#
+# kernelcruft.sh
+#
+# Try to find *.c files in /sys which are orphaned
+#
+# $FreeBSD$
+
+cd /sys/conf
+cat files* | sed '
+/^[ 	]*#/d
+s/[ 	].*//
+/^$/d
+' | sort -u > /tmp/_0
+
+cd /sys
+find * -name '*.c' -print | sed '
+/\/compile\//d
+/^boot/d
+' | sort -u > /tmp/_1
+
+find * -name '*.[ch]' -print | xargs grep 'include.*c[>"]' > /tmp/_2
+
+find * -name 'Makefile*' -print | xargs cat | sed '
+/^	/d
+s/:.*//
+/^[ 	]*$/d
+' > /tmp/_3
+
+comm -13 /tmp/_0 /tmp/_1 | while read f
+do
+	b=`basename $f`
+	if grep $b /tmp/_2 > /dev/null ; then
+		# echo "2 $f"
+		continue
+	fi
+	if grep $b /tmp/_3 > /dev/null ; then
+		# echo "3 $f"
+		continue
+	fi
+	echo $f
+done
+