Disabling eldoc-mode during isearch-mode

[Nordlöw]

I'm trying to disable eldoc-mode during isearch-mode to prevent
flickering caused by their minibuffer-competition.

I found this

(defadvice eldoc-display-message-no-interference-p (around not-during-
isearch)
  "Prevent eldoc from displaying during isearch."
  (unless isearch-mode) ad-do-it)

to do the job but only after having disabled and enabled eldoc-mode
manually in each buffer that should use this behaviour.

I also noticed that C-h f eldoc-display-message-no-interference-p only
says that function is advice once i evaluate it manually after having
adviced it.

Does it have something to do byte-compiling?

Thanks in advance,
Per Nordlöw