Re: Differences in *.elc files

[Gerd Möllmann]

Ulrich Mueller <ulm@gentoo.org> writes:

> Not sure if it is related, but when I compile Emacs with make -j1 and
> with make -j8 (both for commit 336c3674119 on master), it results in the
> file emacs-lisp/eieio-opt.elc having a different size:
>
> -rw-r--r-- 1 ulm users 8716 Oct 10 12:14 eieio-opt.elc-j1
> -rw-r--r-- 1 ulm users 9102 Oct 10 12:23 eieio-opt.elc-j8
>
> Is there a good way to compare byte-compiled files? diff outputs the
> following for the first hunk:

I don't know a way.

>
> $ diff -a -U0 eieio-opt.elc-{j1,j8} | head -n5
> --- eieio-opt.elc-j1     2023-10-10 12:14:29.447911151 +0200
> +++ eieio-opt.elc-j8     2023-10-10 12:23:58.083301315 +0200
> @@ -19 +19 @@
> -(defalias 'eieio-browse-tree #[771
> "\300!\204\301\302\303\304E\"\210\305!\306N\211\307H\262\310P\311P\312P\313\261\210A\203<\314@#\210A\262\202)\205F\314@#\207"
> [class-p signal wrong-type-argument class this-root symbol-name
> cl--class 6 " +--" " | " " " "\n" eieio-browse-tree] 12 (#$ . 890)])
> +(defalias 'eieio-browse-tree #[771
> "\301!\204\302\303\304\305E\"\210\306!\307N\310>\204#\302\303\311D\"\210\211\312H\262\313P\314P\315P\316\261\210A\203K\317@#\210A\262\2028\205U\317@#\207"
> [cl-struct-eieio--class-tags class-p signal wrong-type-argument class
> this-root symbol-name cl--class type-of eieio--class 6 " +--" " | " "
> " "\n" eieio-browse-tree] 12 (#$ . 890)])
>
> After this there are many more differences because all the positions
> have changed.
>
> Parallel build problem because of a missing prerequisite?

I guess so.

If I had to, I'd bet on the cl-check-type in eieio-browse-tree, which in
the -j1 and -j8 case seems to expand to different things.