Debian Bug report logs - #603603
parallel safe /usr/bin/ar

version graph

Package: binutils; Maintainer for binutils is Matthias Klose <[email protected]>; Source for binutils is src:binutils (PTS, buildd, popcon).

Reported by: [email protected]

Date: Mon, 15 Nov 2010 18:45:02 UTC

Severity: normal

Found in version binutils/2.20.1-15

Full log

Message #17 received at [email protected] (full text, mbox, reply):

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Sender: "Barak A. Pearlmutter" <[email protected]>
From: "Barak A. Pearlmutter" <[email protected]>
To: [email protected]
Subject: reopened + more info
Reply-to: "Barak A. Pearlmutter" <[email protected]>
Date: Fri, 19 Dec 2014 09:26:18 +0000
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Just sent control@ message to reopen, as this issue remains present.

There is a discussion in make's info pages

  http://www.gnu.org/software/make/manual/html_node/Archive-Pitfalls.html

which reads

  11.3 Dangers When Using Archives

  It is important to be careful when using parallel execution (the -j
  switch; see Parallel Execution) and archives.  If multiple ar commands
  run at the same time on the same archive file, they will not know
  about each other and can corrupt the file.

  Possibly a future version of make will provide a mechanism to
  circumvent this problem by serializing all recipes that operate on the
  same archive file.  But for the time being, you must either write your
  makefiles to avoid this problem in some other way, or not use -j.

A workaround suggested on stackoverflow is to use

  AR := flock make-ar-tempfile.lock $(AR)

to serialize ar.  Ideally ar itself would have an option to take a lock
on the libXXX.a file it is manipulating, and make would pass that option
by default when running in non-serial mode.
--
Barak A. Pearlmutter <[email protected]>
 Hamilton Institute & Dept Comp Sci, NUI Maynooth, Co. Kildare, Ireland
 http://www.bcl.hamilton.ie/~barak/

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