[완료] cygwin 의 ctags 가 서브디렉토리를 스켄하지 않는군요...

-r REGEXP, --regex=REGEXP or --regex=@regexfile
        Make a tag for each line matching a regular expression pattern
        in the following files.  {LANGUAGE}REGEXP uses REGEXP for LANGUAGE
        files only.  REGEXFILE is a file containing one REGEXP per line.
        REGEXP takes the form /TAGREGEXP/TAGNAME/MODS, where TAGNAME/ is
        optional.  The TAGREGEXP pattern is anchored (as if preceded by ^).
        If TAGNAME/ is present, the tags created are named.
        For example Tcl named tags can be created with:
          --regex="/proc[ \t]+\([^ \t]+\)/\1/.".
        MODS are optional one-letter modifiers: `i' means to ignore case,
        `m' means to allow multi-line matches, `s' implies `m' and
        causes dot to match any character, including newline.
-R, --no-regex
        Don't create tags from regexps for the following files.

       -R   Equivalent to --recurse.