NetBSD Problem Report #40972

From www@NetBSD.org  Fri Mar  6 07:59:03 2009
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Date: Fri,  6 Mar 2009 07:59:03 +0000 (UTC)
From: cgd@google.com
Reply-To: cgd@google.com
To: gnats-bugs@NetBSD.org
Subject: add support to ar for 'deterministic mode'
X-Send-Pr-Version: www-1.0

>Number:         40972
>Category:       toolchain
>Synopsis:       add support to ar for 'deterministic mode'
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    toolchain-manager
>State:          closed
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 06 08:00:00 +0000 2009
>Closed-Date:    Fri Mar 06 14:04:31 +0000 2009
>Last-Modified:  Fri Mar 06 16:50:02 +0000 2009
>Originator:     Chris Demetriou
>Release:        NetBSD-current sources as of 2009-03-05
>Organization:
Toolchain Hackers 'r' Us
>Environment:
irrelevant
>Description:
It's useful for 'ar' to support a deterministic mode of operation, in which ar uses well-known uids, gids, timestamps, file modes, etc., when creating archives.  This allows rebuilds to produce identical .a files.

I've wanted this feature for a while, and I know Perry has too.

The best way I've found to use this to build 'random' software is to create two shell scripts:
 * a wrapper for 'ar' which adds the 'D' flag into the options, and
 * a wrapper for 'ranlib' which is just #!/bin/true

(if people call ranlib to update the archive map timestamp, that'll screw up the nice determinism.)  For use in building NetBSD, it should be sufficient to just set 'D' in the system makefiles' ar flags where appropriate, and stub out uses of ranlib.

I coded the attached patch up based on NetBSD's gnu/dist/binutils sources as of the evening (US/Pacific) 2009-03-05.  I'm putting the uuencoded bzip2'd patch in the 'fix' section, below.  (Let me know if you run into problems decoding it.)
>How-To-Repeat:
ar cv archive1.a obj1.o obj2.o
sleep 5
touch obj1.o obj2.o
ar cv archive2.a obj1.o obj2.o
cmp -l archive1.a archive2.a

lame!
>Fix:
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`
end

>Release-Note:

>Audit-Trail:

State-Changed-From-To: open->closed
State-Changed-By: christos@NetBSD.org
State-Changed-When: Fri, 06 Mar 2009 09:04:31 -0500
State-Changed-Why:
fixed, thanks


From: Chris Demetriou <cgd@google.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: toolchain/40972: add support to ar for 'deterministic mode'
Date: Fri, 6 Mar 2009 08:46:31 -0800

 I forgot to mentionin the PR:

 when i ran 'make headers' in my build dir (i didn't build using the nb
 infra), I found that bfd-in2.h got some random stuff added (VAX
 ELF-related). =A0This means that somebody didn't regen that header
 properly when they made changes elsewhere. =A0(I stripped that, and
 other unrelated changes caused by a 'normal' configure/build, out of
 the patch I sent.)

 That should probably be fixed.


 Also, I've now sent this patch upstream to binutils, who may prefer a
 different option letter. =A0If they do, I'll update this PR... and you
 *really* should use the same option letter that they do! =A08-)

>Unformatted:

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