perl5124delta1

Overview

This document describes differences between the 5.12.3 release and the 5.12.4 release.

If you are upgrading from an earlier release such as 5.12.2, first read perl5123delta, which describes differences between 5.12.2 and 5.12.3. The major changes made in 5.12.0 are described in perl5120delta.

Incompatible Changes

There are no changes intentionally incompatible with 5.12.3. If any exist, they are bugs and reports are welcome.

Selected Bug Fixes

When strict "refs" mode is off, "%{...}" in rvalue context returns "undef" if its argument is undefined. An optimisation introduced in Perl 5.12.0 to make "keys %{...}" faster when used as a boolean did not take this into account, causing "keys %{+undef}" (and "keys %$foo" when $foo is undefined) to be an error, which it should be so in strict mode only [perl #81750].

"lc", "uc", "lcfirst", and "ucfirst" no longer return untainted strings when the argument is tainted. This has been broken since perl 5.8.9 [perl #87336].

Fixed a case where it was possible that a freed buffer may have been read from when parsing a here document.

Modules and Pragmata

Module::CoreList has been upgraded from version 2.43 to 2.50.

Testing

The cpan/CGI/t/http.t test script has been fixed to work when the environment has HTTPS_* environment variables, such as HTTPS_PROXY.

Documentation

Updated the documentation for rand() in perlfunc to note that it is not cryptographically secure.

Platform Specific Notes

Linux

Support Ubuntu 11.04's new multi-arch library layout.

Acknowledgements

Perl 5.12.4 represents approximately 5 months of development since Perl 5.12.3 and contains approximately 200 lines of changes across 11 files from 8 authors.

Perl continues to flourish into its third decade thanks to a vibrant community of users and developers. The following people are known to have contributed the improvements that became Perl 5.12.4:

Andy Dougherty, David Golden, David Leadbeater, Father Chrysostomos, Florian Ragwitz, Jesse Vincent, Leon Brocard, Zsbán Ambrus.