[Emacs-bug-tracker] bug#6858: closed (23.2; race condition in parallel building might lead to byte-compilation failure)

[GNU bug Tracking System]

Your message dated Sat, 11 Sep 2010 14:53:50 -0400
with message-id <address@hidden>
and subject line Re: bug#4196: Parallel bytecomp may sometimes fail
has caused the GNU bug report #4196,
regarding 23.2; race condition in parallel building might lead to 
byte-compilation failure
to be marked as done.

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-- 
4196: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4196
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> --- Begin Message ---
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> Subject: 
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> 23.2;	race condition in parallel building might lead to byte-compilation	failure
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> Date: 
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> Sat, 14 Aug 2010 22:58:46 +0200
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/23.2.50 (gnu/linux)
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>
> 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
> `----
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>
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> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#4196: Parallel bytecomp may sometimes fail
>
>
>
>
> Date: 
>
> Sat, 11 Sep 2010 14:53:50 -0400
>
>
>
>
> User-agent: 
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> Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)
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>
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>
> 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.
>
>
> --- End Message ---