[maker-devel] Use of each() on hash

[Fields, Christopher J]

See this RT ticket:

    https://rt.cpan.org/Public/Bug/Display.html?id=86910

The specific warning in question is there for a good reason, Reini Urban wrote about it recently and why it is bad:

    http://blogs.perl.org/users/rurban/2014/04/do-not-use-each.html

There is a possible 2-line fix, mainly changing a while loop to a for loop, but the bug (originally reported in summer 2013) is still unfortunately open.

Just a note, I don’t agree that perl 5.18.2 is a development release.  Even numbered minor releases (5.10, 5.12…) are considered stable/production, odd numbered ones (5.19) are developer.  I do agree that initial .0 ‘patch’ releases (e.g. 5.18.0) are generally to be avoided, but I always try to use a more recent version of perl when possible.  This version is two releases past the .0, and perl 5.20 (next stable) is due next month.

chris

On Apr 26, 2014, at 10:26 AM, Carson Holt <carsonhh at gmail.com<mailto:carsonhh at gmail.com>> wrote:

The message appears to be coming from forks.pm.  Probably a warning added to perl 5.18.2 which is really really new (other versions don't care about this), and most developers would not consider 5.18 a fully stable release for production purposes (it will have lots of test features and messages that will get improved or dropped rather quickly).  You can try updating the forks module from CPAN.  Otherwise I would ignore it, as forks is sufficiently tested to know it works (it's not a MAKER module, it a widely used CPAN module - literally tens of thousands of scripts use it worldwide).  The authors of forks.pm will take steps to silence the warning rather quickly, or the warning will be removed from the perl interpreter altogether.

Thanks,
Carson

Sent from my iPhone

On Apr 26, 2014, at 8:56 AM, Matthew MacManes <matthew.macmanes at unh.edu<mailto:matthew.macmanes at unh.edu>> wrote:

Hello,

I am getting a large number of errors, while running maker on my ubuntu server.

Use of each() on hash after insertion without resetting hash iterator results in undefined behavior, Perl interpreter: 0x2045200 at /usr/local/lib/perl/5.18.2/forks.pm<http://forks.pm/> line 1736.
Use of each() on hash after insertion without resetting hash iterator results in undefined behavior, Perl interpreter: 0x837200 at /usr/local/lib/perl/5.18.2/forks.pm<http://forks.pm/> line 1736.
Use of each() on hash after insertion without resetting hash iterator results in undefined behavior, Perl interpreter: 0x9d1200 at /usr/local/lib/perl/5.18.2/forks.pm<http://forks.pm/> line 1736.

It is unclear how this effects the results or performance of the software, but these errors are repeated thousands of times in even a small run.

For the record, Maker 2.31, Ubuntu 14.04, perl 5.18.2, MPI via OpenMPI

Compiled perl modules using ./build

Thanks for any insight anyone may have.

__________________________________
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