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Is there a variable I can set to disable the call of octave-sync-function-file-names after saving a file?

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There's no such variable. However, you can still do this, by removing the function from before-save-hook. This is untested, but try:

(remove-hook  'before-save-hook 'octave-sync-function-file-names t)

You'll have to do this in each octave-mode buffer, so you should probably do it from octave-mode-hook like this:

(defun my-octave-deactivate-sync-function ()
  "Don't check equality of function and file names.
Add this to `octave-mode-hook'."
  (remove-hook 'before-save-hook 'octave-sync-function-file-names t))

(add-hook 'octave-mode-hook #'my-octave-deactivate-sync-function)
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    thanks a lot for this piece! I accidentally found out that you can cheat around it by have a statement in the first line of the file. It can be anything like 0; or a=4; – Daniel Hitzel Feb 28 '17 at 19:42
  • Removing the hook had no effect for me, but Daniel's kluge did. – holocronweaver Dec 6 '17 at 6:30
  • @DanielHitzel Yes that works because the file is no longer a function file but an octave script file. This is detected by octave-function-file-p: "Return non-nil if the first token is \"function\"." – Tobias Apr 20 '18 at 9:23
  • @holocronweaver I've added some code example that works for me. – Tobias Apr 20 '18 at 9:33
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This worked for me:

(defun octave-sync-function-file-names () (ignore))

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