GNU bug report logs - #5361
.elcs should tell more about the .els they were compiled from

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: jidanni <at> jidanni.org
To: emacs-pretest-bug <at> gnu.org
Subject: .elcs should tell more about the .els they were compiled from
Date: Tue, 12 Jan 2010 02:29:27 +0800

Let's try to compare two .elc files to see if they are different.

$ diff -a *.elc
2,4c2,4
< ;;; Compiled by jidanni <at> jidanni1.jidanni.org on Sat Jul 25 03:33:07 2009
< ;;; from file /home/jidanni/tmp/emacs-w3m/w3m-dtree.el
< ;;; in Emacs version 23.0.96.1
---
> ;;; Compiled by root <at> jidanni1.jidanni.org on Thu Jan  7 04:59:34 2010
> ;;; from file /usr/share/emacs-snapshot/site-lisp/w3m/w3m-dtree.el
> ;;; in Emacs version 23.1.91.1
...
Well, what would really help is if along with mentioning which .el file
the .elc file was compiled from, would be adding checksum and some ls -l
information about the .el file. Else it is really hard figuring out if
the .elcs are really derived from the .els currently nearby. (And no,
nobody wants to compile again just to see.)

Message #8 received at 5361 <at> debbugs.gnu.org (full text, mbox):

From: Jason Rumney <jasonr <at> gnu.org>
To: jidanni <at> jidanni.org, 5361 <at> debbugs.gnu.org
Subject: Re: bug#5361: .elcs should tell more about the .els they were compiled
	from
Date: Tue, 12 Jan 2010 10:11:07 +0800

On 12/01/2010 02:29, jidanni <at> jidanni.org wrote:
> Let's try to compare two .elc files to see if they are different.
>
> $ diff -a *.elc
> 2,4c2,4
> <  ;;; Compiled by jidanni <at> jidanni1.jidanni.org on Sat Jul 25 03:33:07 2009
> <  ;;; from file /home/jidanni/tmp/emacs-w3m/w3m-dtree.el
> <  ;;; in Emacs version 23.0.96.1
> ---
>    
>> ;;; Compiled by root <at> jidanni1.jidanni.org on Thu Jan  7 04:59:34 2010
>> ;;; from file /usr/share/emacs-snapshot/site-lisp/w3m/w3m-dtree.el
>> ;;; in Emacs version 23.1.91.1
>>      
> ...
> Well, what would really help is if along with mentioning which .el file
> the .elc file was compiled from, would be adding checksum and some ls -l
> information about the .el file. Else it is really hard figuring out if
> the .elcs are really derived from the .els currently nearby. (And no,
> nobody wants to compile again just to see.)
>    

If they are compiled by different versions of Emacs, then you can only 
safely assume they are different, even if the .el files they were 
compiled from are identical.

Message #11 received at 5361 <at> debbugs.gnu.org (full text, mbox):

From: jidanni <at> jidanni.org
To: jasonr <at> gnu.org
Cc: 5361 <at> debbugs.gnu.org
Subject: Re: bug#5361: .elcs should tell more about the .els they were
	compiled from
Date: Tue, 12 Jan 2010 10:27:58 +0800

>>>>> "JR" == Jason Rumney <jasonr <at> gnu.org> writes:
JR> If they are compiled by different versions of Emacs, then you can only
JR> safely assume they are different, even if the .el files they were
JR> compiled from are identical.
Yes but if the user wants to know "were the sources different?". If a
tiny bit of extra information were added to the boilerplate, then he
would have the answer instead of needing forensic analysis or something.

Message #18 received at 5361-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 5361-done <at> debbugs.gnu.org
Subject: Re: bug#5361: .elcs should tell more about the .els they were
	compiled from
Date: Sat, 09 Jul 2011 19:15:36 -0400

No. I don't see a need to keep this report open.

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