xref suggestions are truncated

Question

I use xref to find tags in emacs 25.

My problem is with C defines, when there are multiple definitions. The *xref* buffer shows suggestions, but does not show enough text (it stops right after the identifier).

For example, when looking up PRINTF, one of the found definitions showed in the *xref* buffer looks like this:

#define PRINTF(

while the actual code at that location is:

#define PRINTF(FORMAT, args ...) printf_P(PSTR(FORMAT), ## args)

How do I make the xref buffer show the whole row in the file?

---

Edit: creating my TAGS with:

;; Shell command: find . -type f \( -name '*.cpp' -o -name '*.[ch]pp' \) | etags -
(defun create-tags (dir-name)
  "Create tags file."
  (interactive "DDirectory: ")
  (shell-command
   (format "cd %s && find . -type f \\( -name \'*.[ch]\' -o -name \'*.[ch]pp\' \\) | etags -" dir-name))
  )