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# Find Kconfig variables used in source code but never defined in Kconfig
# Copyright (C) 2007, Paolo 'Blaisorblade' Giarrusso <>
# Tested with dash.
[ -z "$paths" ] && paths=.
# Doing this once at the beginning saves a lot of time, on a cache-hot tree.
Kconfigs="`find . -name 'Kconfig' -o -name 'Kconfig*[^~]'`"
/bin/echo -e "File list \tundefined symbol used"
find $paths -name '*.[chS]' -o -name 'Makefile' -o -name 'Makefile*[^~]'| while read i
# Output the bare Kconfig variable and the filename; the _MODULE part at
# the end is not removed here (would need perl an not-hungry regexp for that).
sed -ne 's!^.*\<\(UML_\)\?CONFIG_\([0-9A-Z_]\+\).*!\2 '$i'!p' < $i
done | \
# Smart "sort|uniq" implemented in awk and tuned to collect the names of all
# files which use a given symbol
awk '{map[$1, count[$1]++] = $2; }
for (combIdx in map) {
split(combIdx, separate, SUBSEP);
# The value may have been removed.
if (! ( (separate[1], separate[2]) in map ) )
printf "%s ", symb;
#Use gawk extension to delete the names vector
delete names;
#Portably delete the names vector
#split("", names);
for (i=0; i < count[symb]; i++) {
names[map[symb, i]] = 1;
# Unfortunately, we may still encounter symb, i in the
# outside iteration.
delete map[symb, i];
for (name in names) {
if (i > 0)
printf ", %s", name;
printf "%s", name;
printf "\n";
}' |
while read symb files; do
# Remove the _MODULE suffix when checking the variable name. This should
# be done only on tristate symbols, actually, but Kconfig parsing is
# beyond the purpose of this script.
symb_bare=`echo $symb | sed -e 's/_MODULE//'`
if ! grep -q "\<$symb_bare\>" $Kconfigs; then
/bin/echo -e "$files: \t$symb"