This week summary doesn't feature very exceptional bug fixes, or utterly important information, or pearls of the most pleasant sense of humor of the perl5-porters. Does this mean that it's completely non-interesting ? Read it and judge by yourself : shortcuts, ACLs, meta-information, and a couple of cows.
Last week, Edward Peschko started a discussion about adding support for
Windows shortcuts (.lnk files) in the perl core. He asked whether the
lib pragma could be modified to support the syntax
use lib "shortcut.lnk";
Several approaches were suggested : modifying readlink() on Windows, to
handle shortcuts, or have a Windows-specific module that redefines
CORE::readlink(). Several people noted that a shortcut is not the same
thing at all than a symlink, and thus that perl should not cheat about
readlink() and paths involving symlinks.
http://xrl.us/hi6
Stas Bekman remarks that some OSes use ACL (Access Control List) -based file access controls. He asks whether perl could use internally the equivalent of
POSIX::access($file, &POSIX::X_OK())
instead of -x $file, where access(2) is supported.
Mark Mielke points out that the filetest operators are not (in the general
case) equivalent to the access(2) mechanism, due to a possible difference
between the effective user id and the real user id. And backward
compatibility should be preserved. Jarkko Hietaniemi recalls that the
filetest pragma should be used modify to the semantics of filetests.
http://xrl.us/hi7
Later, Slaven Rezic asks whether filetest works at all. This pragma is
supposed to be lexically-scoped, like strict. It is not, because it
tests the compiler hints at run-time, but they are only relevant at
compile time. This was fixed by Jarkko and Slaven.
Aaron Sherman asked about copy-on-write : how it's supported, and whether
it's going to become the default. (Reminder : perl can be compiled with
the -DPERL_COPY_ON_WRITE cc flag, which enables copying string values only
when they're changed.) He's looking for ways to improve the performance of
SpamAssassin, a tool that processes lots of strings if any, and apparently
tries to implement a module to provide COW-enabled magic scalars. Nicholas
Clark summarized the state of the copy-on-write feature : the good news:
I can't measure any slowdown. The bad news: I can't measure any speedup.
http://xrl.us/hi8
Autrijus Tang posted a detailed proposal about the inclusion of a standard
META.yml file in CPAN distributions, and the inclusion therein of some
meta-information that could be used by the CPAN indexer, to prevent some
files or directories from being indexed. Ken Williams noted that
Module::Build was already able to generate a META.yml file. Autrijus'
proposal was extensively discussed in a long thread
http://xrl.us/hi9
$VERSION John Peacock is apparently about to post a patch that makes the $VERSION variable magical, so that it automagically turns version-like scalars assigned to it into version objects.
Matthew O. Persico asks about the possibility to backport John's changes via a CPAN module.
http://xrl.us/hja
Casey West continued to send doc patches and to close doc bugs. And indeed, due to general effort, a lot of bugs were closed. By the way, Robert Spier is organizing the PerlBugAthon, aimed at closing as many perlbugs as possible, during OSCON 2003's Hackathon.
http://www.perl.org/oscon/2003/perlbugathon/
Gurusamy Sarathy warns that there are probably cases of non-thread-safety in perl 5.8.0, because some global variables have gone into perlvars.h, instead of being put into intrpvars.h. Sorting them out is needed.
http://xrl.us/hjb
Rafael Garcia-Suarez provided a patch to get bleadperl working on SCO OpenUNIX 8.
Tye McQueen proposed a simple patch to fix a bug in hash bucket assignment (the number of buckets not growing in some pathological cases).
Richard Clamp posted a quick-fix patch to get perl 5.005_03 to compile on newer Linux distributions.
http://xrl.us/hjc (long)
Brent Dax asked why regex-heredocs aren't allowed (something like $string =~ <</FOO/). Perhaps because they're not really needed.
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