Latest CVS Emacs has a bug in lib-src/etags.

% cd emacs/src
% make tags
../lib-src/etags --include=TAGS-LISP --include=../lwlib//TAGS --regex='/[ 	]*DEFVAR_[A-Z_ 	(]+"\([^"]+\)"/' /usr/local/work/emacs/src/[xyzXYZ]*.[hc] /usr/local/work/emacs/src/[a-wA-W]*.[hc]
make: *** [TAGS] Segmentation fault

The seqfault occurs on GNU/Linux at this line (the last line
of the function incanonicalize_filename):

  *fn = '\0';

I suspect this change introduced this bug.

2008-08-17  Francesco Potort$(D+@(B  <pot@gnu.org>

	* etags.c (main): Use canonicalize_filename on tags file name.
	(relative_filename): Revert 3.85: do not collapse slashes here.
	(absolute_dirname): Remove useless call to canonicalize_filename.
	(canonicalize_filename): Collapse multiple slashes here.

---
Kenichi Handa
handa@ni.aist.go.jp