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bug#5361: .elcs should tell more about the .els they were compiled from


From: Jason Rumney
Subject: bug#5361: .elcs should tell more about the .els they were compiled from
Date: Tue, 12 Jan 2010 10:11:07 +0800
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0

On 12/01/2010 02:29, address@hidden wrote:
Let's try to compare two .elc files to see if they are different.

$ diff -a *.elc
2,4c2,4
<  ;;; Compiled by address@hidden 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 address@hidden 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.







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