For some reason, (maybe the approach of mod_perl 2), one of the main topics this week was interpreter cloning and the problems it may cause. But the release of perl 5.6.2 is an event that is not to be neglected. Read on.
The latest episode in our maintenance series is perl 5.6.2, which was
released saturday. After the RC1 last week, some remaining bugs were
shaken out, and some of them solved. The announcement on P5P is here
http://xrl.us/4pb
Perl 5.6.3 will eventually be a more advanced release, including a load of bugfixes and module upgrades (while 5.6.2 is merely oriented toward fixing compilation issues.)
Bug #24463 reports that a DBI test is failing under perl 5.8.2-ithreads
built with debugging capabilities (-DDEBUGGING). This is due to a
regression in the cloning of interpreters, that was introduced to fix a
segfault when using the -D switch to perl. The problem here is that the
new interpreter that is being cloned hasn't yet perlio layers, and thus
can't use print debug messages ; but trying to set the context back at the
perlio layers of the pristine interpreter leads to this breakage.
http://xrl.us/4pe
Stas Bekman reported that Config::myconfig() is prone to fail with a fatal
error under ithreads, with perl 5.8.[12], due to its internal use of a:unique variable (made readonly when a new thread is started).
Elizabeth provides a fix. (It appears that mod_perl 2 is a great tool to
find thread-related bugs.)
Stas reported also another problem with Scalar::Util::weaken() : clones
of weak scalars are messed up. This happens since perl 5.8.1.
Following to another question by Stas about the CLONE method, Elizabeth
introduced her module Thread::Bless.
http://xrl.us/4pk
Elizabeth Mattijsen notices that using an empty subroutine as a method may produce segfault in some specific cases with perl 5.8.2. Enache Adrian provides a fix.
http://xrl.us/4pc
Chip Salzenberg reports as bug #24468 that the headers of perl 5.8.2, with threading turned on, can't be compiled from within C++ sources. This is a problem for C++ applications that embed perl. Jan Dubois suggests a fix, which Chip is going to try.
http://xrl.us/4pd
Nicholas Clark notices that creating threads in BEGIN blocks is unsupported. He disapproves this constraint.
Nicholas also found and fixed obscure bugs with hashes and UTF8 keys. He proposes to refactor some hash-handling code.
http://xrl.us/4pp
Alan Burlison notices that the MANIFEST.SKIP distributed with perl 5.8.2 (as part of ExtUtils::Makemaker) is unfortunately broken. Rafael takes the blame.
http://xrl.us/4pf
Nick Ing-Simmons suggests to investigate using mapfiles on Linux for the compilation of perl. Alan Burlison nods.
http://xrl.us/4pg
A version of the IRIX compiler can't build perl 5.8.1 or 5.8.2 (bug #24471). Rafael suggests it's a bug in the C preprocessor.
Andy Lester released Test::Harness 2.36. This version includes a
command-line utility, prove, that can run individual tests. Its
inclusion into the core still causes a few unresolved problems.
http://xrl.us/4ph
Michael Schwern released ExtUtils::MakeMaker 6.21, mostly to fix building modules that call dir_target() or completely rewrite top_targets().
This summary was brought to you by Rafael Garcia-Suarez. Weekly summaries are available on http://use.perl.org/ and via a mailing list, which subscription address is perl5-summary-subscribe@perl.org . Feedback (and patches) welcome.