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From: Xah Lee on 22 Jun 2010 09:55
Stung by a emacs byte-compile problem. Cost: 2 hours.

Summary: if you are doing elisp dev on more than one machine, best to
re-byte-compile the files on the machine if you run into some strange
errors.

Byte compiled elisp files should work cross-platform for emacs 23.2.
It has been working between my Windows Vista and Mac 10.4.x in the
past year. Today, i just byte compiled the whole dir of elisp files on
our ErgoEmacs source trunk, then synced over to my Mac as a regular
routine, then started emacs on my Mac. I keep getting this strange
error on my Mac:

Wrong number of arguments: called-interactively-p, 1

Very odd error. Starting emacs with “--debug-init” didn't help.
Turning on toggle-debug-on-error while emacs is running didn't help
much neither.

I thought some new change i made to ErgoEmacs recently caused the
error. So, i started to bebug. Tried to comment out various packages,
but it's elusive. One time commenting out loading package X seems to
work, but another time no, but commenting out package Y worked.

First i thought the problem is the ErgoEmacs Keybinding minor mode.
Then i'm sure it's YASnippet. But that's odd, because we haven't
touched that package for many months. Then, i think it could be
xbbcode-mode.

Very odd error. “Wrong number of arguments”. Thats pretty much the
error you'll notice first when you write a new function. And “called-
interactively-p”?? In the “*Messages*” buffer, i also saw something
about a hook that caused this. Bah, there's lots hooks in ErgoEmacs.
The ErgoEmacs keybinding has hooks, yasnippet adds hooks i think.
Maybe the new version of PrettyControlL (pp-c-l) i just updated today
caused the problem. Recently we also updated to new versions of Tuareg
mode for OCaml and also new version of haskell mode.

In short, took me 2 hours to eventually realize that it is the “.elc”.
Byte compile the whole elisp dir of packages on the Mac made it work.

How did i realize it? Hard to pinpoint to a logical reason. Just some
coding experience i guess.

Emacs 23.2's release notes does not mention any byte-compile
incompatible changes.

Not quite sure what's the problem exactly. The emacs on my Windows is
Emacs 23.2.1, while on the Mac is 23.1.1.

Note: emacs 22 can't read emacs 23's byte compiled file if the file
contains unicode chars, due to emacs 23's unicode change. See: New
Features in Emacs 23.

----------------------------
perm url http://xahlee.org/emacs/elisp_byte_compile_problem.html

Xah
∑ http://xahlee.org/

☄
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