1

While debugging a minor mode (separate issue), I wanted to generate a stack trace of the message function so I thought I would just enter

M-x debug-on-entry RET message

I was quite surprised to see that this method did not work. No stack trace was generated instead I started to get the error

Lisp nesting exceeds `max-lisp-eval-depth'

Which probably means that the message function was being called from the debugger, and debugger was calling message again making an infinite loop. Is there a more fool-proof way of generating full traces of who called the message function ?

4

You want to use the debug-on-message variable in this situation.

If non-nil, debug if a message matching this regexp is displayed.
  • Good answer, was it easy to find in the docs ? I tried apropos but gave up maybe too quickly. – Pushpendre Mar 18 '15 at 3:40
  • It's certainly easy if you already know it's there :) I first spotted it in the NEWS file when 24.3 was released. Searching for "debug" with apropos finds it quickly enough, I think? In the manual you can find it under both (elisp) Error Debugging and also (elisp) Explicit Debug, and a repeated isearch for "message" in the debugger section turns it up pretty soon. So yeah... you probably gave up a bit early in this instance. – phils Mar 18 '15 at 6:34

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