GNU bug report logs - #4196
Parallel bytecomp may sometimes fail

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Sven Joachim <svenjoac <at> gmx.de>
Subject: bug#6858: closed (Re: bug#4196: Parallel bytecomp may sometimes fail)
Date: Sat, 11 Sep 2010 18:52:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#4196: 23.2; race condition in parallel building might lead to byte-compilation failure

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 6858 <at> debbugs.gnu.org.

-- 
4196: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4196
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Glenn Morris <rgm <at> gnu.org>
To: 4196-done <at> debbugs.gnu.org
Subject: Re: bug#4196: Parallel bytecomp may sometimes fail
Date: Sat, 11 Sep 2010 14:53:50 -0400

Version: 24.1

Hopefully fixed by this change:

2010-09-11  Glenn Morris  <rgm at gnu.org>

  * emacs-lisp/bytecomp.el (byte-compile-file): Create .elc files
  atomically, to avoid parallel build errors.

[Message part 3 (message/rfc822, inline)]

From: Sven Joachim <svenjoac <at> gmx.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.2;
	race condition in parallel building might lead to byte-compilation
	failure
Date: Sat, 14 Aug 2010 22:58:46 +0200

In bootstrapping, consider the situation where bar.el does
(require 'foo).  It usually does not matter whether bar.el or foo.el are
compiled first, but if they are built in parallel there is a window
where foo.elc is half written, and then byte-compiling bar.el will fail
(or worse, be misbuilt).

If that sounds unlikely because write-region is usually fast: it just
happened for the emacs23 Debian package on amd64 (with "make -j 4"), see
https://buildd.debian.org/fetch.cgi?pkg=emacs23&arch=amd64&ver=23.2%2B1-3&stamp=1281813034&file=log.
The relevant excerpt follows:

,----
| In gnus-summary-limit-to-bodies:
| gnus-sum.el:8359:57:Warning: `save-excursion' defeated by `set-buffer'
| Wrote /build/buildd-emacs23_23.2+1-3-amd64-ofeZOD/emacs23-23.2+1/debian/build-nox/lisp/gnus/gnus-win.elc
| Compiling /build/buildd-emacs23_23.2+1-3-amd64-ofeZOD/emacs23-23.2+1/debian/build-nox/lisp/gnus/gnus.el
| 
| In toplevel form:
| gnus/gnus-vm.el:36:1:Error: Required feature `gnus-sum' was not provided
| make[3]: *** [/build/buildd-emacs23_23.2+1-3-amd64-ofeZOD/emacs23-23.2+1/debian/build-nox/lisp/gnus/gnus-vm.elc] Error 1
| make[3]: *** Waiting for unfinished jobs....
| Wrote /build/buildd-emacs23_23.2+1-3-amd64-ofeZOD/emacs23-23.2+1/debian/build-nox/lisp/gnus/gnus-sum.elc
`----

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.