GNU bug report logs - #25629
Automake output non-deterministic when used with later Perls

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Package: automake; Reported by: demerphq <demerphq@HIDDEN>; Keywords: moreinfo; dated Mon, 6 Feb 2017 02:38:01 UTC; Maintainer for automake is bug-automake@HIDDEN.
Added tag(s) moreinfo. Request was from Mathieu Lirzin <mthl@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 25629 <at> debbugs.gnu.org:


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From: Mathieu Lirzin <mthl@HIDDEN>
To: demerphq <demerphq@HIDDEN>
Subject: Re: bug#25629: Hrm, actually autom4te isnt part of automake,
 but rather autoconf.
References: <CANgJU+XuyCm1By-5JzrrB6yHSz8n94SWvmP9Ao26Tu+BvPiWFA@HIDDEN>
 <CANgJU+X4rzUmsqptghhY+VtsB4n-iaobeV_DgH-YUQq=JMRwPw@HIDDEN>
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Hello Yves,

demerphq <demerphq@HIDDEN> writes:

> Also I observe that there were previous patches to ensure most uses of
> keys() were sorted. However not all of them, including diagnostics,
> and various other places where the key order could be exposed to a
> user.
>
> Attached is a patch that I believe fixes any remaining uses of unsorted keys.
>
> I took the policy that automake is not performance sensitive, at least
> at the level of sorting keys, and that sorting something that is not
> strictly necessary does no harm.
>
> I admit I have not been able to properly test all of these changes,
> but superficial testing does not reveal any issues.
>
> Anyway, sorry for the misleading original bug-report.
>
> Cheers,
> Yves

Can you explain what would be the benefit for Automake to have such
deterministic behavior?

Thanks for the report.

-- 
Mathieu Lirzin
GPG: F2A3 8D7E EB2B 6640 5761  070D 0ADE E100 9460 4D37




Information forwarded to bug-automake@HIDDEN:
bug#25629; Package automake. Full text available.

Message received at 25629 <at> debbugs.gnu.org:


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Subject: Hrm, actually autom4te isnt part of automake, but rather autoconf.
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--f403045ec2daa8332e0547d44ba0
Content-Type: text/plain; charset=UTF-8

Also I observe that there were previous patches to ensure most uses of
keys() were sorted. However not all of them, including diagnostics,
and various other places where the key order could be exposed to a
user.

Attached is a patch that I believe fixes any remaining uses of unsorted keys.

I took the policy that automake is not performance sensitive, at least
at the level of sorting keys, and that sorting something that is not
strictly necessary does no harm.

I admit I have not been able to properly test all of these changes,
but superficial testing does not reveal any issues.

Anyway, sorry for the misleading original bug-report.

Cheers,
Yves

-- 
perl -Mre=debug -e "/just|another|perl|hacker/"

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--f403045ec2daa8332e0547d44ba0--




Information forwarded to bug-automake@HIDDEN:
bug#25629; Package automake. Full text available.

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From: demerphq <demerphq@HIDDEN>
Date: Mon, 6 Feb 2017 03:32:11 +0100
Message-ID: <CANgJU+XuyCm1By-5JzrrB6yHSz8n94SWvmP9Ao26Tu+BvPiWFA@HIDDEN>
Subject: Automake output non-deterministic when used with later Perls
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Some time back I switched Perl to using a randomly seeded hash
function. (I am a core perl committer, and I do a lot of work on its
hash function.)

A consequence of this is that default output from tools like
Data::Dumper is non-deterministic, meaning output files under source
control, etc, change unnecessarily every time.

At least part of the automake toolset is affected, for instance autom4te.

For autom4te a simple solution is to add:

$Data::Dumper::Sortkeys = 1;

to the script. This seems to fix the problem I was observing, but an
audit of the use of  the "keys" function to ensure that any such use
for output is sorted will eliminate this class of errors.

I would be happy to put together a pull request, or a patch if you
could point me to the relevant repository. (Which does not appear to
be documented in the installed versions of automake, although I may
have overlooked it.)

I am sorry I cannot give a better reproduction description than this:

while hacking the "dieharder" package I observed that after running
"autoreconf -i" that the file ./autom4te.cache/requests file changed
in ways that it should not have. Opening the file I observed it
contains output clearly from the Perl Data::Dumper module, I then made
the patch to autom4te described above, and observed that after running
"autoreconf -i" again the output was sorted, and that after running it
yet again the file was unchanged.

Classic unsorted use of undefined hash order bug that we had to do a
lot of cleanup in the Perl world around the time of Perl 5.10

Thanks,
Yves



-- 
perl -Mre=debug -e "/just|another|perl|hacker/"




Acknowledgement sent to demerphq <demerphq@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-automake@HIDDEN. Full text available.
Report forwarded to bug-automake@HIDDEN:
bug#25629; Package automake. Full text available.
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