scripts/checkkconfigsymbols.sh

   1 #!/bin/sh
   2 # Find Kconfig variables used in source code but never defined in Kconfig
   3 # Copyright (C) 2007, Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
   4
   5 # Tested with dash.
   6 paths="$@"
   7 [ -z "$paths" ] && paths=.
   8
   9 # Doing this once at the beginning saves a lot of time, on a cache-hot tree.
  10 Kconfigs="`find . -name 'Kconfig' -o -name 'Kconfig*[^~]'`"
  11
  12 /bin/echo -e "File list \tundefined symbol used"
  13 find $paths -name '*.[chS]' -o -name 'Makefile' -o -name 'Makefile*[^~]'| while read i
  14 do
  15         # Output the bare Kconfig variable and the filename; the _MODULE part at
  16         # the end is not removed here (would need perl an not-hungry regexp for that).
  17         sed -ne 's!^.*\<\(UML_\)\?CONFIG_\([0-9A-Z_]\+\).*!\2 '$i'!p' < $i
  18 done | \
  19 # Smart "sort|uniq" implemented in awk and tuned to collect the names of all
  20 # files which use a given symbol
  21 awk '{map[$1, count[$1]++] = $2; }
  22 END {
  23         for (combIdx in map) {
  24                 split(combIdx, separate, SUBSEP);
  25                 # The value may have been removed.
  26                 if (! ( (separate[1], separate[2]) in map ) )
  27                         continue;
  28                 symb=separate[1];
  29                 printf "%s ", symb;
  30                 #Use gawk extension to delete the names vector
  31                 delete names;
  32                 #Portably delete the names vector
  33                 #split("", names);
  34                 for (i=0; i < count[symb]; i++) {
  35                         names[map[symb, i]] = 1;
  36                         # Unfortunately, we may still encounter symb, i in the
  37                         # outside iteration.
  38                         delete map[symb, i];
  39                 }
  40                 i=0;
  41                 for (name in names) {
  42                         if (i > 0)
  43                                 printf ", %s", name;
  44                         else
  45                                 printf "%s", name;
  46                         i++;
  47                 }
  48                 printf "\n";
  49         }
  50 }' |
  51 while read symb files; do
  52         # Remove the _MODULE suffix when checking the variable name. This should
  53         # be done only on tristate symbols, actually, but Kconfig parsing is
  54         # beyond the purpose of this script.
  55         symb_bare=`echo $symb | sed -e 's/_MODULE//'`
  56         if ! grep -q "\<$symb_bare\>" $Kconfigs; then
  57                 /bin/echo -e "$files: \t$symb"
  58         fi
  59 done|sort