When I start emacs, I get a couple of byte compilation warnings in a window that pops up:

Warning (bytecomp): `interactive-p' is an obsolete function (as of 23.2); use `called-interactively-p' instead. [7 times]
Warning (bytecomp): Use `with-current-buffer' rather than save-excursion+set-buffer

Can I get emacs to give me locations?

  • 3
    This info would be useful to everyone. Use M-x report-emacs-bug to request this feature.
    – abo-abo
    Jun 29 '15 at 7:52
  • If you try to set debug-on-message to Warning (bytecomp), won't it trigger the debugger?
    – wvxvw
    Jun 29 '15 at 9:38
  • 2
    IIRC you do get file names when Emacs knows the file. So presumably the above comes from some Elisp code which was "generated on the fly" rather than saved to a file and then passed to the byte-compiler. In 99% of the cases, starting Emacs should actually not compile any code at all, so maybe the problem can be fixed at an even higher level.
    – Stefan
    Jun 29 '15 at 12:51
  • @wvxvw - I didn't manage to make debug-on-message do anything. In the end, the interactive-p turned out to be caused by screen-lines.el, and the with-current-buffer one was due to an ancient version of tuareg-mode. I decided to remove both. I don't use tuareg-mode, and while I quite like screen-lines.el, it's long caused me all sorts of problems with keyboard macros.
    – Tom Seddon
    Aug 23 '15 at 1:35

This happens due to display-warning delaying warnings until after init time. By then, the file name and location are no longer known.

(defun display-warning (type message &optional level buffer-name)
  (if (not (or after-init-time noninteractive (daemonp)))
      ;; Ensure warnings that happen early in the startup sequence
      ;; are visible when startup completes (bug#20792).
      (delay-warning type message level buffer-name)
    (unless level
    [... ]

You should be able to disable this with some advice:

(defun dont-delay-compile-warnings (fun type &rest args)
  (if (eq type 'bytecomp)
      (let ((after-init-time t))
        (apply fun type args))
    (apply fun type args)))
(advice-add 'display-warning :around #'dont-delay-compile-warnings)

Although this might prevent the *Warnings* buffer from popping up (as described in Bug#20792), so you'll have to check it manually in the *Compile-Log* buffer.

Previous case of this, reported on emacs-devel here (continues here).


I'm going to guess the warnings are coming from on-the-fly compilation of ELPA packages. Try running the following code:

(defun my-package-recompile()
  "Recompile all packages"
  (byte-recompile-directory "~/.emacs.d/elpa" 0 t))

After M-x my-package-recompile switch the the Compile-Log buffer and see if these warnings are replicated in there?

  • I have the same problem but only the first error and 2 times. This solution didn't work. Also, it said Done (Total of 4 files compiled, 1 failed, 2 skipped in 3 directories).
    – trss
    Sep 28 '16 at 10:25
  • Sorry, thought this was about fixing the problem, not obtaining more information. I tried looking for the error now but it didn't appear in the list.
    – trss
    Sep 28 '16 at 10:41

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