+=encoding utf8
+
=head1 NAME
perl5110delta - what is new for perl v5.11.0
=head1 Incompatible Changes
+=head2 In @INC, move ARCHLIB and PRIVLIB after the current version's site_perl and vendor_perl.
+
=head2 Switch statement changes
The handling of complex expressions by the C<given>/C<when> switch
-statement has been enhanced. There are two new cases where C<when> now
+statement has been enhanced. These enhancements are also available in
+5.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
interprets its argument as a boolean, instead of an expression to be used
in a smart match:
The next section details more changes brought to the semantics to
the smart match operator, that naturally also modify the behaviour
of the switch statements where smart matching is implicitly used.
+These changers were also made for the 5.10.1 release, and will remain in
+subsequent 5.10 releases.
=head2 Smart match changes
# matches in 5.8.x, doesn't match in 5.10.0
$re = qr/^bar/; "foo\nbar" =~ /$re/m;
+=item *
+
+C<length undef> now returns undef.
+
=back
=head1 Core Enhancements
=head2 Unicode Character Database 5.1.0
-The copy of the Unicode Character Database included in Perl 5.10.1 has
+The copy of the Unicode Character Database included in Perl 5.11.0 has
been updated to 5.1.0 from 5.0.0. See
L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
notable changes.
=head2 A proper interface for pluggable Method Resolution Orders
-As of Perl 5.10.1 there is a new interface for plugging and using method
+As of Perl 5.11.0 there is a new interface for plugging and using method
resolution orders other than the default (linear depth first search).
The C3 method resolution order added in 5.10.0 has been re-implemented as
a plugin, without changing its Perl-space interface. See L<perlmroapi> for
=head2 Support for C<configure_requires> in CPAN module metadata
Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
-in the C<META.yml> metadata file included in most recent CPAN distributions.
+in the F<META.yml> metadata file included in most recent CPAN distributions.
This allows distribution authors to specify configuration prerequisites that
must be installed before running F<Makefile.PL> or F<Build.PL>.
See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
on how to specify C<configure_requires> when creating a distribution for CPAN.
+=head2 The C<each> function can now operate on arrays
+
+=head2 Perl's core time-related functions are now Y2038 compliand
+
+=head2 The variable C<$,> may now be tied
+
+=head2 // now behaves like || in when clauses
+
+=head2 You can now set C<-W> from the C<PERL5OPT> environment varialbe
+
=head1 Modules and Pragmata
=head2 New Modules and Pragmata
=item C<attrs>
-Upgraded from version 1.02 to 1.03.
+The C<attrs> pragma has been removed. It had been marked as deprecated since
+5.6.0.
=item C<base>
=item C<constant>
-Upgraded from version 1.13 to 1.17.
+Upgraded from version 1.13 to 1.19. Some code has been shifted from run time to
+compile time, and the amount of MRO cache flushing has been minimised.
=item C<feature>
C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
kept for backwards compatibility for programs that used to pre-load it.
-
=item C<CGI>
Upgraded from version 3.29 to 3.43.
=item C<File::Copy>
-Upgraded from version 2.11 to 2.14.
+Upgraded from version 2.11 to 2.16.
+
+File::Copy now always return 0 (not "") on failure.
+
+FIXME - describe C<cp>
=item C<File::Fetch>
Upgraded from version 1.00 to 1.01.
+Added -X overloading, -M, -C and -A.
+
=item C<File::Temp>
Upgraded from version 0.18 to 0.22.
Upgraded from version 1.35 to 1.37.
+=item Pod::Perldoc
+
+Upgrade from version 3.14_02 to 3.15.
+
=item C<Pod::Simple>
Upgraded from version 3.05 to 3.07.
=item C<Term::ANSIColor>
-Upgraded from version 1.12 to 2.00.
+Upgraded from version 1.12 to 2.01.
=item C<Term::ReadLine>
=item C<threads>
-Upgraded from version 1.67 to 1.72.
+Upgraded from version 1.67 to 1.73.
=item C<threads::shared>
Upgraded from version 1.04 to 1.05.
+UNIVERSAL->import() is now deprecated.
+
=item C<Win32>
Upgraded from version 0.34 to 0.39.
The debugger now correctly handles proxy constant subroutines, and
subroutine stubs.
+=item F<perlbug>
+
+F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out upstream bug
+tracker URLs.
+
+Where the user names a module that their bug report is about, and we know the
+URL for its upstream bug tracker, provide a message to the user explaining
+that the core copies the CPAN version directly, and provide the URL for
+reporting the bug directly to upstream.
+
=item F<perlthanks>
-Perl 5.10.1 adds a new utility F<perlthanks>, which is a variant of
+Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
F<perlbug>, but for sending non-bug-reports to the authors and maintainers
of Perl. Getting nothing but bug reports can become a bit demoralising:
we'll see if this changes things.
=head1 Changes to Existing Documentation
-The various large C<Changes*> files (which listed every change made to perl
+The various large F<Changes*> files (which listed every change made to perl
over the last 18 years) have been removed, and replaced by a small file,
-also called C<Changes>, which just explains how that same information may
+also called F<Changes>, which just explains how that same information may
be extracted from the git version control system.
The file F<Porting/patching.pod> has been deleted, as it mainly described
L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
generated at build time, rather than being shipped as part of the release.
+=head2 Documented -X overloading.
+
+=head2 Documented that when() treats specially most of the filetest operators
+
+=head2 Documented when as a syntax modifier
+
+=head2 Eliminated "Old Perl threads tutorial", which describes 5005 threads.
+
+pod/perlthrtut.pod is the same material reworked for ithreads.
+
+=head2 Correct previous documentation: v-strings are not deprecated
+
+With version objects, we need them to use MODULE VERSION syntax. This
+patch removes the deprecation note.
+
=head1 Performance Enhancements
=over 4
=item *
+The implementation of C<C3> Method Resolution Order has been optimised -
+linearisation for classes with single inheritance is 40% faster. Performance
+for multiple inheritance is unchanged.
+
+=item *
+
Under C<use locale>, the locale-relevant information is now cached on
read-only values, such as the list returned by C<keys %hash>. This makes
operations such as C<sort keys %hash> in the scope of C<use locale> much
Empty C<DESTROY> methods are no longer called.
+=item *
+
+Faster sv_utf8_upgrade()
+
+=item *
+
+Speed up keys() on empty hash
+
=back
=head1 Installation and Configuration Improvements
options to specify an exact list of extensions to build, you will need to
change it to account for this.
-For 5.10.2, it is planned that many dual-life modules will have been moved
+For 5.11.1, it is planned that many dual-life modules will have been moved
from F<lib> to F<ext>; again this will have no effect on an installed
perl, but will matter if you invoke F<Configure> with a pre-canned list of
extensions to build.
behaviour in the cygwin.com build for years. The hints files have been
updated.
+=item DomainOS
+
+Support for Apollo DomainOS was removed in Perl 5.11.0
+
=item FreeBSD
The hints files now identify the correct threading libraries on FreeBSD 7
Patches from the Haiku maintainers have been merged in. Perl should now
build on Haiku.
+=item MiNT
+
+Support for Atari MiNT was removed in Perl 5.11.0.
+
=item MirOS BSD
Perl should now build on MirOS BSD.
shell and other utilities that depend on POSIX exit values. See
L<perlvms/"$?"> for details.
+C<File::Copy> now detects Unix compatibility mode on VMS.
+
=back
=head1 Selected Bug Fixes
=over 4
-=item
+=item *
-=item C<-I> on shebang line now adds directories in front of @INC.
+C<-I> on shebang line now adds directories in front of @INC.
as documented, and as does C<-I> when specified on the command-line.
(Renée Bäcker)
-=item
+=item *
-* C<kill> is now fatal when called on non-numeric process identifiers.
+C<kill> is now fatal when called on non-numeric process identifiers.
Previously, an 'undef' process identifier would be interpreted as a request to
kill process "0", which would terminate the current process group on POSIX
systems. Since process identifiers are always integers, killing a non-numeric
=item *
-The C<-i.suffix> command-line switch now recreates the file using
+The C<-i>I<.suffix> command-line switch now recreates the file using
restricted permissions, before changing its mode to match the original
file. This eliminates a potential race condition [RT #60904].
=item *
-Under some circumstances, $^R could incorrectly become undefined
+Under some circumstances, C<$^R> could incorrectly become undefined
[RT #57042].
=item *
-(XS) In various hash functions, passing a pre-computed hash to when the
-key is UTF-8 might result in an incorrect lookup.
+In the XS API, various hash functions, when passed a pre-computed hash where
+the key is UTF-8, might result in an incorrect lookup.
=item *
-(XS) Including F<XSUB.h> before F<perl.h> gave a compile-time error
+XS code including F<XSUB.h> before F<perl.h> gave a compile-time error
[RT #57176].
=item *
Assertion rx->sublen >= (s - rx->subbeg) + i failed
-
=back
=head1 New or Changed Diagnostics
=item *
-A new tool, C<Porting/expand-macro.pl> has been added, that allows you
+A new tool, F<Porting/expand-macro.pl> has been added, that allows you
to view how a C preprocessor macro would be expanded when compiled.
This is handy when trying to decode the macro hell that is the perl
guts.
Some regexes may run much more slowly when run in a child thread compared
with the thread the pattern was compiled into [RT #55600].
-
=back
=head1 Deprecations
=item *
-C<suidperl> will be removed in 5.12.0. This provides a mechanism to
+C<suidperl> has been removed. It used to provide a mechanism to
emulate setuid permission bits on systems that don't support it properly.
+=item *
+
+Deprecate assignment to $[
+
+=item *
+
+Remove attrs, which has been deprecated since 1999/10/02.
+
+=item *
+
+Deprecate use of the attribute :locked on subroutines.
+
+=item *
+
+Deprecate using "locked" with the attributes pragma.
+
+=item *
+
+Deprecate using "unique" with the attributes pragma.
+
+=item *
+
+warn if ++ or -- are unable to change the value because it's beyond the limit of representation
+
+This uses a new warnings category: "imprecision".
+
+=item *
+
+Make lc/uc/lcfirst/ucfirst warn when passed undef.
+
+=item *
+
+Show constant in "Useless use of a constant in void context"
+
+=item *
+
+Make the new warning report undef constants as undef
+
+=item *
+
+Add a new warning, "Prototype after '%s'"
+
+=item *
+
+Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
+
+=item *
+
+Unintented interpolation of $\ in regex
+
+=item *
+
+Make overflow warnings in gmtime/localtime only occur when warnings are on
+
+=item *
+
+Improve mro merging error messages.
+
+They are now very similar to those produced by Algorithm::C3.
+
+=item *
+
+Amelioration of the error message "Unrecognized character %s in column %d"
+
+Changes the error message to "Unrecognized character %s; marked by <--
+HERE after %s<-- HERE near column %d". This should make it a little
+simpler to spot and correct the suspicious character.
+
+=item *
+
+Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
+
=back
=head1 Acknowledgements
The other core committers contributed most of the changes, and applied most
of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
+Much of the work of categorizing changes in this perldelta file was contributed
+by the following porters using changelogger.bestpractical.com:
+
+Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
+anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
+Mark Fowler, chorny, anonymous, tmtm
+
Finally, thanks to Larry Wall, without whom none of this would be
necessary.
The F<Artistic> and F<Copying> files for copyright information.
=cut
+
+
+=head1 TODO
+
+The following changes are a filtered list of changes which weren't backported
+to 5.10.1. They were run through changelogger.bestpractical.com and triaged
+by a set of Perl 5 Porters. Changes to blead after 5945e41e have not yet
+been triaged or integrated.
+
+The following changes need to be
+
+1) deleted if they don't merit inclusion
+
+ OR
+
+2) lightly copyedited and integrated into the perldelta above. Unfortunately, many of our
+commit messages are somewhat terse and require a bit more help to turn into something readable
+
+
+
+
+=head1 API
+
+=head2 Move the reg_stringify logic to Perl_sv_2pv_flags
+
+=head2 mg_copy ought to take an I32
+
+=head2 Perl_store_cop_label() isn't meant to be part of the public API.
+
+=head2 Perl_gv_fetchmethod{,_autoload,_flags} are actually never* called with a non-NULL stash.
+So change the parameter to NN.
+
+
+=head2 Promote Perl_setdefout() to the public API.
+
+=head2 Add get_cvs() as a shortcut for STR_WITH_LEN() and Perl_get_cvn_flags()
+
+=head2 In Perl_newCONSTSUB(), sv should not be NULL.
+
+=head2 GvUNIQUE* have been defined as 0 since 2005/06/30 - high time to remove them.
+
+=head2 invert and rename PERL_MEM_LOG_STDERR to PERL_MEM_LOG_NOIMPL
+
+Most users who want PERL_MEM_LOG want the default implementation,
+give it to them. Users providing their own implementation can
+obtain current behavior by adding -DPERL_MEM_LOG_NOIMPL.
+Frankly, the average user probably wants _ENV by default too.
+
+=head2 simplify PERL_MEM_LOG
+
+This combines multiple environment variable reads into 1,
+where it looks for values like "2mst"
+-2 leading digits are atoi()d to get FD
+-m memory logging please
+-s sv logging also
+-t timestamp those please.
+
+Combining these reduces overhead such that it seemed
+worthwhile to drop all the ifdefs. TBD whether this works
+in the environment that drove the original tradeoffs.
+
+If it isnt enough, Id be tempted by a global static ptr,
+and on 1st use, is read, seen 0, a lock is taken, and getenvar
+run to populate it, unlocked, proceed. This would remove
+iterative overheads.
+
+=head2 Add a parameter "destructing" to Gv_AMupdate()
+
+This boolean parameter indicates if the function has been called
+to update the overload magic table while looking up the DESTROY
+method. In this case, it's probably best to avoid croaking if
+those tables could not be updated (for example due to a method
+that could not be loaded.)
+
+=head2 Modify the return value of Gv_AMupdate to indicate a compilation error
+
+This way we'll restore most of the performance on object desctruction
+lost by the previous commit
+
+
+=head2 local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
+
+Re: [perl #60360] [PATCH] UPDATED: local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
+Message-ID: <20081112234504.GI2062@tytlal.topaz.cx>
+
+Updated patch to retain source compatibility.
+
+Plus using the correct PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS
+macro and running make regen.
+
+=head2 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
+
+Respecting inc_version_list while processing PERL_VENDORLIB_STEM
+From: "Mandalemula, Rajesh" <Rajesh.Mandalemula@deshaw.com>
+
+=head2 Change PL_debug behaviour
+
+
+String eval lines are now saved whenever
+a subroutine is defined, even if the eval'd string has subsequent
+syntax errors. This allows the debugger to single step into these
+subroutines.
+
+
+=head2 Tied filehandles now have an additional method EOF which provides the EOF type
+
+=head2 Perl is now smarter about adding a -I dir to the beginning or end of @INC
+
+=head2 On scope end, delete localized array elements that should not exist anymore, so that the array recovers its previous length. Honour EXISTS and DELETE for tied arrays.
+
+=head2 When a glob is deleted, mark its sub as ANON.
+
+=head2 Require a space or a newline after a "#line XXX" directive
+
+=head2 Forbid using "foreach" as an attribute
+
+(like all other control flow statements)
+
+
+=head2 Unregister signal handlers before destroying my_perl
+
+If the signal handler runs after perl_destruct() has been called, it
+will get an invalid (or NULL) my_perl when it asks for the
+thread-specific interpreter struct. This patch resets the signal
+handler for any signal previously handled by PL_csighandlerp to SIG_DFL
+before calling perl_destruct().
+
+=head2 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
+
+Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
+instead of the now-removed INT handler.
+
+=head2 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
+
+[perl #66452] TMPDIR not honored when opening an anonymous temporary file
+
+=head2 The attached patch to perlio.c fixes the problem of errno getting set.
+
+While I am firmly in the school of "do not look at $! except immediately
+after a failure", I also agree that spuriously setting it is messy. But
+there is just no way of knowing where your errno might have been.
+
+The problem was that PerlIO_fast_gets() (and other nearby similar
+capability-checking PerlIO routines) set the errno (and it was being
+called a lot, from sv_gets()). I think setting the errno here was
+a mistake: checking for "can has FOO" should not set external state,
+such as the errno. The patch removes that errno trashing from all those
+routines.
+
+=head2 Trim all trailing / from "." in @INC when filling %INC
+
+This fixes bug #66942 : as a / was left in the directory name,
+$INC{"Foo.pm"} for a file loaded from the current directory
+was given the incorrect value "/Foo.pm".
+
+=head2 Don't enqueue pending signals during global destruction
+
+Global destruction is not signal-safe. PL_psig_pend may already
+be gone when the signal handler is called (with destruct_level > 0).
+NULL it before freeing it to prevent a race condition.
+
+=head2 Eliminate struct regexp_allocated and xpvio_allocated.
+
+Calculate memory allocation using regexp and XPVIO, and the offset of the first
+real structure member. This avoids tripping over alignment differences between
+X* and x*_allocated, because x*_allocated doesn't have a double in it.
+
+
+=head1 internals
+
+=head2 [perl #47047] Use of inherited AUTOLOAD for non-method is deprecated
+
+=head2 Remove the definitions of Null(), Nullch, Nullfp, Nullsv and PL_na when code is within the perl source tree
+
+=head2 Replace our assert-which-can-be-caught-by-eval with the real deal from the standard C library.
+
+=head2 Tweak Perl_sv_upgrade() so that references can upgrade to SVt_PV
+
+=head2 Eliminate prelen from struct regexp.
+
+=head2 Change Perl_av_iter_p() to return IV* rather than I32* (which means
+
+=head2 Reorder the external regexp flags to get RXf_PMf_STD_PMMOD into the
+
+lowest 4 bits (which saves a shift), and the "flags indicating special
+patterns" into contiguous bits. This makes everything a little tidier,
+and saves 88 bytes (woohoo!) of object file with -Os on x86 FreeBSD.
+
+
+=head2 Re-implement the SvOOK() hack to store the offset as a BER encoded number in the part of the PVX that is being released.
+(It will always
+fit, as chopping off 1 byte gives just enough space for recording a
+delta of up to 127). This allows SvOOK() to co-exist with SvIOK_on(),
+which means all the calls to SvOOK_off() [with the possibility of a
+call to sv_backoff()] in SvIOK_on() can be removed. This ought to make
+a lot of straight line code a little bit simpler.
+OOK()d scalars can now be SVt_PV, as the IVX isn't needed.
+
+=head2 Abolish wraplen from struct regexp. We're already storing it in SvCUR.
+
+=head2 Make Perl_pregcomp() use SvUTF8() of the pattern, rather than the flag bit in pmflags, to decide whether the pattern is UTF-8.
+
+=head2 Abolish RXf_UTF8. Store the UTF-8-ness of the pattern with SvUTF8().
+
+=head2 In struct regexp move the member paren_names to the IV union.
+
+=head2 Make REGEXP a type distinct from SV. (Much like AV, CV, GV, HV).
+
+=head2 Allow sv_setsv_flags() to copy SVt_REGEXP much like it copies SVt_FORMAT - the just string buffer.
+
+
+=head2 Correct a long-standing ithreads reference counting anonamly
+
+The reference count only needs "doubling" when the scalar is pushed onto
+PL_regex_padav for the second time.
+
+
+=head2 In PL_regexp_padav, store regexps via real references, rather than hiding them within IVs.
+
+We can do this now that they are real SV pointers.
+
+=head2 With regexps stored as real RVs, we can eliminate SvREPADTMP().
+
+=head2 REGEXPs are now stored directly in PL_regex_padav, rather than indirectly via RVs.
+
+=head2 Remove code that protected pp_qr against REGEXPs going away during global destruction whilst they were stored via true references in PL_regex_padav.
+
+=head2 Remove PM_GETRE_SAFE and PM_SETRE_SAFE as nothing uses them.
+
+=head2 Note the U8 sized space created by removing -P, and check that it is now an illegal command line flag.
+
+=head2 Pack the recycled pad offsets into an SV at PL_regex_pad[0].
+
+=head2 Re-order so that the !SvOK() case is last (which should be rare)
+
+=head2 Extend PUSHFORMAT() to take a second parameter to set retop, to save NULLing it and then reassigning.
+
+=head2 Split struct block_sub into struct block_sub and struct block_format.
+
+Split struct block_sub into struct block_sub and struct block_format.
+(CXt_SUB and CXt_FORMAT were using some comon members, but some members
+were only for one or the other.)
+
+=head2 Change the wantarray result from caller from IV to bool for the SCALAR/ARRAY case.
+
+This doesn't contradict the documentation, as there isn't any. Oops.
+
+
+=head2 Give G_VOID, G_SCALAR and G_ARRAY the same numeric values as OPf_WANT_VOID, OPf_WANT_SCALAR and OPf_WANT_LIST.
+
+
+=head2 Squeeze the context type down to 4 bits, and move the private flags to fit within the next 4 bits.
+
+
+=head2 In struct block change blku_type from U8 to U16, and the "spare" U8 to U16, with the lockstep changes in struct subst.
+Eliminate lval from
+struct block_sub, and instead store it in the U16 in struct block.
+
+
+=head2 In struct block_eval, eliminate old_in_eval and old_op_type by storing the data in blk_u16.
+
+
+=head2 The layout for struct block_loop under ithreads can be simplified.
+
+Instead of wedging the pad offset into a void* iterdata, and always
+storing PL_comppad even when it isn't used, instead do this:
+
+PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
+/* This is also accesible via cx->blk_loop.my_op->op_targ */
+PADOFFSET targoffset;
+
+and store the GV pointer in oldcompad. Pointers to pointers seems
+cleaner. This also allows us to eliminate the flag bit CXp_PADVAR.
+
+
+=head2 In XS_PerlIO_get_layers() take advantage of the implementation of
+
+In XS_PerlIO_get_layers() take advantage of the implementation of
+PerlIO_get_layers(), by co-opting the new SVs it creates, rather than
+copying them.
+
+
+=head2 Micro-optimise the order of the context types. [Because I can :-)]
+
+=head2 [patch] optimize OP_IS_(FILETEST|SOCKET) macros
+
+=head2 Eliminate ck_lengthconst.
+
+=head2 Chainsaw DEBUG_S out, as suggested by Vincent Pit.
+
+=head2 Unsupported private API functions are now declared "static" to prevent leakage to the public API
+
+=head2 Perl_cv_ckproto() is not part of the public API, and not used anywhere. It has been removed
+
+=head2 Remove all the 5005threads specific mutex macros, which are now vestigial.
+
+=head2 Do not honor TMPDIR for anonymous temporary files when tainting
+
+Use a default of /tmp on Unixes when TMPDIR is unset or empty, or
+when creation of a temporary file in it fails
+
+=head2 Add a pluggable hook in op_free()
+
+
projects / p5sagit/p5-mst-13.2.git / blobdiff