5.7.1 release.
(To view the differences between the 5.6.0 release and the 5.7.0
-release, see L<perl570delta>).
+release, see L<perl570delta>.)
=head1 Security Vulnerability Closed
to continue to be supported, it may be completely removed from future
releases. In any case, suidperl should only be used by security
experts who know exactly what they are doing and why they are using
-suidperl instead of some other solution such as sudo (see
-http://www.courtesan.com/sudo/).
+suidperl instead of some other solution such as sudo
+( see http://www.courtesan.com/sudo/ ).
=head1 Incompatible Changes
=back
-=head1 Retired Features
-
-The use of chop() is now deprecated. This has been made easier by
-rewriting all the examples in the documentation to use chomp() instead.
-
=head1 Core Enhancements
-=over 4
+=head2 AUTOLOAD Is Now Lvaluable
-=item *
+AUTOLOAD is now lvaluable, meaning that you can add the :lvalue attribute
+to AUTOLOAD subroutines and you can assign to the AUTOLOAD return value.
+
+=head2 PerlIO is Now The Default
-AUTOLOAD is now lvaluable.
+=over 4
=item *
open($fh,">:utf8","Uni.txt");
+Note for EBCDIC users: the pseudo layer ":utf8" is erroneously named
+for you since it's not UTF-8 what you will be getting but instead
+UTF-EBCDIC. See L<perlunicode>, L<utf8>, and
+http://www.unicode.org/unicode/reports/tr16/ for more information.
+In future releases this naming may change.
+
=item *
File handles can translate character encodings from/to Perl's internal
=item *
-The following keywords are now overrideable: chop, chomp, each, keys,
-pop, push, shift, splice, unshift.
+The following builtin functions are now overridable: chop(), chomp(),
+each(), keys(), pop(), push(), shift(), splice(), unshift().
=item *
and basic arithmetics (+ - * /) if the arguments are integers, and
tries also to keep the results stored internally as integers.
This change leads into often slightly faster and always less lossy
-arithmetics (previously Perl always preferred floating point numbers
-in its math)
+arithmetics. (Previously Perl always preferred floating point numbers
+in its math.)
=item *
-
-The printf and sprintf now support parameter reordering using the
-C<%\d+\$> and C<*\d+\$> syntaxes.
+
+The printf() and sprintf() now support parameter reordering using the
+C<%\d+\$> and C<*\d+\$> syntaxes. For example
+
+ print "%2\$s %1\$s\n", "foo", "bar";
+
+will print "bar foo\n"; This feature helps in writing
+internationalised software.
=item *
=item *
The Unicode Character Database coming with Perl has been upgraded
-to Unicode 3.1.
+to Unicode 3.1. For more information, see http://www.unicode.org/ ,
+and http://www.unicode.org/unicode/reports/tr27/
+
+For developers interested in enhancing Perl's Unicode capabilities:
+almost all the UCD files are included with the Perl distribution in
+the lib/unicode subdirectory. The most notable omission, for space
+considerations, is the Unihan database.
=item *
=back
-=head2 Modules and Pragmata
+=head2 Signals Are Now Safe
+
+Perl used to be fragile in that signals arriving at inopportune moments
+could corrupt Perl's internal state.
+
+=head1 Modules and Pragmata
=head2 New Modules
=item *
-B::Concise is a new compiler back end for walking the Perl syntax tree,
-printing concise info about ops. The output is highly customizable,
-so customizable that B::Terse has been re-implemented in terms of
-B::Concise.
+B::Concise, by Stephen McCamant, is a new compiler backend for
+walking the Perl syntax tree, printing concise info about ops.
+The output is highly customisable.
+
+See L<B::Concise> for more information.
=item *
-Class::ISA for reporting the search path for a class's ISA tree,
-from Sean Burke, has been added.
+Class::ISA, by Sean Burke, for reporting the search path for a
+class's ISA tree, has been added.
+
+See L<Class::ISA> for more information.
=item *
=item *
-Digest, a front end module for calculating digests (checksums),
+Digest, a frontend module for calculating digests (checksums),
from Gisle Aas, has been added.
+See L<Digest> for more information.
+
=item *
-Digest::MD5 for calculating MD5 digests (checksums), from Gisle Aas,
+Digest::MD5 for calculating MD5 digests (checksums), by Gisle Aas,
has been added.
-NOTE: the MD5 backward compatibility module is purposefully not
+ use Digest::MD5 'md5_hex';
+
+ $digest = md5_hex("Thirsty Camel");
+
+ print $digest, "\n"; # 01d19d9d2045e005c3f1b80e8b164de1
+
+NOTE: the MD5 backward compatibility module is deliberately not
included since its use is discouraged.
+See L<Digest::MD5> for more information.
+
=item *
-Encode provides a mechanism to translate between different character
-encodings. Support for Unicode, ISO-8859-*, ASCII, CP*, KOI8-R, and
-three variants of EBCDIC are compiled in to the module. Several other
-encodings (like Japanese, Chinese, and MacIntosh encodings) are
-included and will be loaded at runtime.
+Encode, by Nick Ing-Simmons, provides a mechanism to translate
+between different character encodings. Support for Unicode,
+ISO-8859-*, ASCII, CP*, KOI8-R, and three variants of EBCDIC are
+compiled in to the module. Several other encodings (like Japanese,
+Chinese, and MacIntosh encodings) are included and will be loaded at
+runtime.
Any encoding supported by Encode module is also available to the
":encoding()" layer if PerlIO is used.
+See L<Encode> for more information.
+
=item *
-Filter::Simple is an easy-to-use front end to Filter::Util::Call,
+Filter::Simple is an easy-to-use frontend to Filter::Util::Call,
from Damian Conway.
+ # in MyFilter.pm:
+
+ package MyFilter;
+
+ use Filter::Simple sub {
+ while (my ($from, $to) = splice @_, 0, 2) {
+ s/$from/$to/g;
+ }
+ };
+
+ 1;
+
+ # in user's code:
+
+ use MyFilter qr/red/ => 'green';
+
+ print "red\n"; # this code is filtered, will print "green\n"
+ print "bored\n"; # this code is filtered, will print "bogreen\n"
+
+ no MyFilter;
+
+ print "red\n"; # this code is not filtered, will print "red\n"
+
+See L<Filter::Simple> for more information.
+
=item *
-Filter::Util::Call, from Paul Marquess, provides you with the
+Filter::Util::Call, by Paul Marquess, provides you with the
framework to write I<Source Filters> in Perl. For most uses
-the front end Filter::Simple is to be preferred.
+the frontend Filter::Simple is to be preferred.
+See L<Filter::Util::Call> for more information.
=item *
locale standards, such as "fr" for France, "usd" for US Dollar, and
"jp" for Japanese.
+ use Locale::Country;
+
+ $country = code2country('jp'); # $country gets 'Japan'
+ $code = country2code('Norway'); # $code gets 'no'
+
+See L<Locale::Constants>, L<Locale::Country>, L<Locale::Currency>,
+and L<Locale::Language> for more information.
+
=item *
-MIME::Base64, from Gisle Aas, allows you to encode data in base64.
+MIME::Base64, by Gisle Aas, allows you to encode data in base64.
+
+ use MIME::Base64;
+
+ $encoded = encode_base64('Aladdin:open sesame');
+ $decoded = decode_base64($encoded);
+
+ print $encoded, "\n"; # "QWxhZGRpbjpvcGVuIHNlc2FtZQ=="
+
+See L<MIME::Base64> for more information.
=item *
-MIME::QuotedPrint, from Gisle Aas, allows you to encode data in
+MIME::QuotedPrint, by Gisle Aas, allows you to encode data in
quoted-printable encoding.
+ use MIME::QuotedPrint;
+
+ $encoded = encode_qp("Smiley in Unicode: \x{263a}");
+ $decoded = decode_qp($encoded);
+
+ print $encoded, "\n"; # "Smiley in Unicode: =263A"
+
MIME::QuotedPrint has been enhanced to provide the basic methods
necessary to use it with PerlIO::Via as in :
- use MIME::QuotedPrint;
- open($fh,">Via(MIME::QuotedPrint)",$path)
+ use MIME::QuotedPrint;
+ open($fh,">Via(MIME::QuotedPrint)",$path)
+
+See L<MIME::QuotedPrint> for more information.
=item *
-PerlIO::Scalar provides the IO to "in memory" perl scalars discussed
-above. It also serves as an example of a loadable layer.
+PerlIO::Scalar, by Nick Ing-Simmons, provides the implementation of
+IO to "in memory" Perl scalars as discussed above. It also serves as
+an example of a loadable layer. Other future possibilities include
+PerlIO::Array and PerlIO::Code. See L<PerlIO::Scalar> for more
+information.
=item *
-PerlIO::Via acts as a PerlIO layer and wraps PerlIO layer
-functionality provided by a class (typically implemented in
-perl code).
+PerlIO::Via, by Nick Ing-Simmons, acts as a PerlIO layer and wraps
+PerlIO layer functionality provided by a class (typically implemented
+in perl code).
+
+ use MIME::QuotedPrint;
+ open($fh,">Via(MIME::QuotedPrint)",$path)
+
+This will automatically convert everything output to C<$fh>
+to Quoted-Printable. See L<PerlIO::Via> for more information.
=item *
-Pod::Text::Overstrike, from Joe Smith, has been added.
+Pod::Text::Overstrike, by Joe Smith, has been added.
It converts POD data to formatted overstrike text.
+See L<Pod::Text::Overstrike> for more information.
=item *
-Switch from Damian Conway has been added. After
+Switch from Damian Conway has been added. Just by saying
+
+ use Switch;
+
+you have C<switch> and C<case> available in Perl.
- use Switch;
+ use Switch;
-you have switch() and case() in Perl.
+ switch ($val) {
+
+ case 1 { print "number 1" }
+ case "a" { print "string a" }
+ case [1..10,42] { print "number in list" }
+ case (@array) { print "number in list" }
+ case /\w+/ { print "pattern" }
+ case qr/\w+/ { print "pattern" }
+ case (%hash) { print "entry in hash" }
+ case (\%hash) { print "entry in hash" }
+ case (\&sub) { print "arg to subroutine" }
+ else { print "previous case not true" }
+ }
+
+See L<Switch> for more information.
=item *
Text::Balanced from Damian Conway has been added, for
extracting delimited text sequences from strings.
+ use Text::Balanced 'extract_delimited';
+
+ ($a, $b) = extract_delimited("'never say never', he never said", "'", '');
+
+$a will be "'never say never'", $b will be ', he never said'.
+
+In addition to extract_delimited() there are also extract_bracketed(),
+extract_quotelike(), extract_codeblock(), extract_variable(),
+extract_tagged(), extract_multiple(), gen_delimited_pat(), and
+gen_extract_tagged(). With these you can implement rather advanced
+parsing algorithms. See L<Text::Balanced> for more information.
+
=item *
-Tie::RefHash::Nestable, from Edward Avis, allows storing hash references
-(unlike the standard Tie::Refhash)
+Tie::RefHash::Nestable, by Edward Avis, allows storing hash references
+(unlike the standard Tie::RefHash) The module is contained within
+Tie::RefHash.
=item *
-XS::Typemap is a test extension that exercises XS typemaps.
-Nothing gets installed but for extension writers the code is
-worth studying.
+XS::Typemap, by Tim Jenness, is a test extension that exercises XS
+typemaps. Nothing gets installed but for extension writers the code
+is worth studying.
=back
=item *
-B::Deparse should be now more robust (still far from providing a full
-round trip for any random piece of Perl code).
+B::Deparse should be now more robust. It still far from providing a full
+round trip for any random piece of Perl code, though, and is under active
+development: expect more robustness in 5.7.2.
=item *
-Class::Struct has now compile-time features.
+Class::Struct can now define the classes in compile time.
=item *
-Math::BigFloat has undergone much fixing.
+Math::BigFloat has undergone much fixing, and in addition the fmod()
+function now supports modulus operations.
+
+( The fixed Math::BigFloat module is also available in CPAN for those
+who can't upgrade their Perl: http://www.cpan.org/authors/id/J/JP/JPEACOCK/ )
=item *
is positioned at the out-of-band mark. The method is also exportable
as a sockatmark() function.
-=item
+=item *
IO::Socket::INET has support for ReusePort option (if your platform
-supports it). The Reuse option has now an alias, ReuseAddr.
+supports it). The Reuse option now has an alias, ReuseAddr. For clarity
+you may want to prefer ReuseAddr.
=item *
-Net::Ping has been greatly enhanced.
+Net::Ping has been enhanced. There is now "external" protocol which
+uses Net::Ping::External module which runs external ping(1) and parses
+the output. An alpha version of Net::Ping::External is available in
+CPAN and in 5.7.2 the Net::Ping::External may be integrated to Perl.
=item *
=item *
POSIX::sigaction() is now much more flexible and robust.
+You can now install coderef handlers, 'DEFAULT', and 'IGNORE'
+handlers, installing new handlers was not atomic.
=item *
=back
-The following modules have been upgraded from CPAN: CPAN, CGI, DB::File,
-Getopt::Long, Pod::Man, Pod::Text, Storable, Text-Tabs+Wrap.
+The following modules have been upgraded from the versions at CPAN:
+CPAN, CGI, DB_File, File::Temp, Getopt::Long, Pod::Man, Pod::Text,
+Storable, Text-Tabs+Wrap.
=head1 Performance Enhancements
=item *
Hashes now use Bob Jenkins "One-at-a-Time" hashing key algorithm
-(http://burtleburtle.net/bob/hash/doobs.html).
-This algorithm is reasonably fast while producing a much better spread
-of values. Hash values output from the algorithm on a hash of all
-3-char printable ASCII keys comes much closer to passing the DIEHARD
-random number generation tests. According to perlbench, this change
-has not affected the overall speed of Perl.
+( http://burtleburtle.net/bob/hash/doobs.html ). This algorithm is
+reasonably fast while producing a much better spread of values than
+the old hashing algorithm (originally by Chris Torek, later tweaked by
+Ilya Zakharevich). Hash values output from the algorithm on a hash of
+all 3-char printable ASCII keys comes much closer to passing the
+DIEHARD random number generation tests. According to perlbench, this
+change has not affected the overall speed of Perl.
=item *
=head2 perlclib
Internal replacements for standard C library functions.
+(Interesting only for extension writers and Perl core hackers.)
=head2 perliol
=head2 README.macos
In perl 5.7.1 (and in the 5.6.1) the MacPerl sources have been
-synchronized with the standard Perl sources. To compile MacPerl
+synchronised with the standard Perl sources. To compile MacPerl
some additional steps are required, and this file documents those
steps. On install README.macos will be installed as L<perlmacos>.
The README.mpeix has been podified, which means that this information
about compiling and using Perl on the MPE/iX miniframe platform will
-
on install be installed as L<perlmpeix>.
+be installed as L<perlmpeix>.
=head2 README.solaris
=head2 README.vos
The README.vos has been podified, which means that this information
-about compiling and using Perl on the Stratus VOS miniframe platform will
-
on install be installed as L<perlvos>.
+about compiling and using Perl on the Stratus VOS miniframe platform
+
will be installed as L<perlvos>.
=head2 Porting/repository.pod
Documentation on how to use the Perl source repository has been added.
-=head1 Performance Enhancements
-
=head1 Installation and Configuration Improvements
+=over 4
+
+=item *
+
Because PerlIO is now the default on most platforms, "-perlio" doesn't
get appended to the $Config{archname} (also known as $^O) anymore.
Instead, if you explicitly choose not to use perlio (Configure command
line option -Uuseperlio), you will get "-stdio" appended.
+=item *
+
Another change related to the architecture name is that "-64all"
-(-Duse64bitall, or "maximally 64-bit") is appended only if your pointers
-are 64 bits wide.
+(-Duse64bitall, or "maximally 64-bit") is appended only if your
+pointers are 64 bits wide. (To be exact, the use64bitall is ignored.)
+
+=item *
APPLLIB_EXP, a less-know configuration-time definition, has been
documented. It can be used to prepend site-specific directories
to Perl's default search path (@INC), see INSTALL for information.
+=item *
+
Building Berkeley DB3 for compatibility modes for DB, NDBM, and ODBM
has been documented in INSTALL.
+=item *
+
If you are on IRIX or Tru64 platforms, new profiling/debugging options
-have been added, see L</perlhack> for more information about pixie and
+have been added, see L<perlhack> for more information about pixie and
Third Degree.
+=back
+
=head2 New Or Improved Platforms
+For the list of platforms known to support Perl,
+see L<perlport/"Supported Platforms">.
+
=over 4
=item *
=item *
-AmigaOS has been verified to be happy with Perl after a long pause.
+After a long pause, AmigaOS has been verified to be happy with Perl.
=item *
-MacOS Classic (MacPerl has of course been available since
+EBCDIC platforms (z/OS, also known as OS/390, POSIX-BC, and VM/ESA)
+have been regained. Many test suite tests still fail and the
+co-existence of Unicode and EBCDIC isn't quite settled, but the
+situation is much better than with Perl 5.6. See L<perlos390>,
+L<perlbs2000> (for POSIX-BC), and L<perlvmesa> for more information.
+
+=item *
+
+Building perl with -Duseithreads or -Duse5005threads now works under
+HP-UX 10.20 (previously it only worked under 10.30 or later). You will
+need a thread library package installed. See README.hpux.
+
+=item *
+
+Mac OS Classic (MacPerl has of course been available since
perl 5.004 but now the source code bases of standard Perl
-and MacPerl have been synchronized)
+and MacPerl have been synchronised)
=item *
-NCR MP-RAS
+NCR MP-RAS is now supported.
=item *
-NonStop-UX
+NonStop-UX is now supported.
=item *
-Amdahl UTS
+Amdahl UTS is now supported.
=item *
=item *
-Some new Configure symbols, useful for extension writers: d_cmsghdr
-(for struct cmsgdhr), d_fcntl_can_lock (whether fcntl() can be used
-for file locking), d_fsync, d_getitimer(), d_getpagsz (for getpagesize(),
-though you should prefer POSIX::sysconf(_SC_PAGE_SIZE)), d_msghdr_s
-(for struct msgdhr), need_va_copy (whether one needs to use Perl_va_copy()
-to copy varargs), d_readv, d_recvmsg, d_sendmsg, sig_size (the number
-of elements in an array needed to hold all the available signals),
-d_sockatmark, d_strtoq, d_u32align (whether one needs to access
-character data aligned by U32 sized pointers), d_ualarm, d_usleep,
-d_writev.
+Some new Configure symbols, useful for extension writers:
+
+=over 8
+
+=item d_cmsghdr
+
+For struct cmsghdr.
+
+=item d_fcntl_can_lock
+
+Whether fcntl() can be used for file locking.
+
+=item d_fsync
+
+=item d_getitimer
+
+=item d_getpagsz
+
+For getpagesize(), though you should prefer POSIX::sysconf(_SC_PAGE_SIZE))
+
+=item d_msghdr_s
+
+For struct msghdr.
+
+=item need_va_copy
+
+Whether one needs to use Perl_va_copy() to copy varargs.
+
+=item d_readv
+
+=item d_recvmsg
+
+=item d_sendmsg
+
+=item sig_size
+
+The number of elements in an array needed to hold all the available signals.
+
+=item d_sockatmark
+
+=item d_strtoq
+
+=item d_u32align
+
+Whether one needs to access character data aligned by U32 sized pointers.
+
+=item d_ualarm
+
+=item d_usleep
+
+=back
=item *
If your file system supports symbolic links you can build Perl outside
of the source directory by
-
+
mkdir /tmp/perl/build/directory
cd /tmp/perl/build/directory
sh /path/to/perl/source/Configure -Dmksymlinks ...
=head1 Selected Bug Fixes
-Numerous memory leaks have been hunted down. Most importantly anonymous
-subs used to leak quite a bit.
+Numerous memory leaks and uninitialized memory accesses have been hunted down.
+Most importantly anonymous subs used to leak quite a bit.
=over 4
=item *
-Small unpredictactabilities in the order of DESTROYS have been
-even small.
+chop(@list) in list context returned the characters chopped in
+reverse order. This has been reversed to be in the right order.
+
+=item *
+
+The order of DESTROYs has been made more predictable.
=item *
=item *
-The PERL5OPT environment variable didn't really work before.
+Attributes (like :shared) didn't work with our().
+
+=item *
+
+The PERL5OPT environment variable (for passing command line arguments
+to Perl) didn't work for more than a single group of options.
+
+=item *
+
+The tainting behaviour of sprintf() has been rationalized. It does
+not taint the result of floating point formats anymore, making the
+behaviour consistent with that of string interpolation.
=item *
=item *
-Previously DYNIX/ptx had problems in its Configure probe for
-non-blocking I/O.
+Previously DYNIX/ptx had problems in its Configure probe for non-blocking I/O.
+
+=item *
+
+Windows
+
+=over 8
+
+=item *
+
+Borland C++ v5.5 is now a supported compiler that can build Perl.
+However, the generated binaries continue to be incompatible with those
+generated by the other supported compilers (GCC and Visual C++).
+
+=item *
+
+Win32::GetCwd() correctly returns C:\ instead of C: when at the drive root.
+Other bugs in chdir() and Cwd::cwd() have also been fixed.
+
+=item *
+
+Duping socket handles with open(F, ">&MYSOCK") now works under Windows 9x.
+
+=item *
+
+HTML files will be installed in c:\perl\html instead of c:\perl\lib\pod\html
+
+=item *
+
+The makefiles now provide a single switch to bulk-enable all the features
+enabled in ActiveState ActivePerl (a popular binary distribution).
+
+=back
=back
Two new debugging options have been added: if you have compiled your
Perl with debugging, you can use the -DT and -DR options to trace
-tokenizing and to add reference counts to displaying variables,
+tokenising and to add reference counts to displaying variables,
respectively.
=over 4
=item *
-If an attempt to use a (non-blessed) reference as an array element
+If an attempt to use a (non-blessed) reference as an array index
is made, a warning is given.
=item *
=item *
-Some new internal APIs: ptr_table_clear, ptr_table_free, sv_setref_uv.
-For the full list see L<perlapi>.
+Some new APIs: ptr_table_clear(), ptr_table_free(), sv_setref_uv().
+For the full list
of the available APIs see L<perlapi>.
=item *
-dTHR and djSP have been obsoleted; the former removed and the latter
-replaced with dSP.
+dTHR and djSP have been obsoleted; the former removed (because it's
+a no-op) and the latter replaced with dSP.
=item *
-Perl now uses system malloc instead of Perl malloc in all 64-bit platforms.
+Perl now uses system malloc instead of Perl malloc on all 64-bit
+platforms, and even in some not-always-64-bit platforms like AIX,
+IRIX, and Solaris. This change breaks backward compatibility but
+Perl's malloc has problems with large address spaces and also the
+speed of vendors' malloc is generally better in large address space
+machines (Perl's malloc is mostly tuned for space).
=back
+=head1 New Tests
+
+Many new tests have been added. The most notable is probably the
+lib/1_compile: it is very notable because running it takes quite a
+long time -- it test compiles all the Perl modules in the distribution.
+Please be patient.
+
=head1 Known Problems
-=head2 lib/b test 19
+Note that unlike other sections in this document (which describe
+changes since 5.7.0) this section is cumulative containing known
+problems for all the 5.7 releases.
-The test fails in various platforms (PA64 and IA64 are known), but the
-exact cause is still being investigated.
+=head2 AIX vac 5.0.0.0 May Produce Buggy Code For Perl
-=head2 Localizing a Tied Variable Leaks Memory
+The AIX C compiler vac version 5.0.0.0 may produce buggy code,
+resulting in few random tests failing, but when the failing tests
+are run by hand, they succeed. We suggest upgrading to at least
+vac version 5.0.1.0, that has been known to compile Perl correctly.
+"lslpp -L|grep vac.C" will tell you the vac version.
- use Tie::Hash;
- tie my %tie_hash => 'Tie::StdHash';
+=head2 lib/ftmp-security tests warn 'system possibly insecure'
- ...
+Don't panic. Read INSTALL 'make test' section instead.
- local($tie_hash{Foo}) = 1; # leaks
+=head2 lib/io_multihomed Fails In LP64-Configured HP-UX
-Code like the above is known to leak memory every time the local()
-is executed.
+The lib/io_multihomed test may hang in HP-UX if Perl has been
+configured to be 64-bit. Because other 64-bit platforms do not hang in
+this test, HP-UX is suspect. All other tests pass in 64-bit HP-UX. The
+test attempts to create and connect to "multihomed" sockets (sockets
+which have multiple IP addresses).
+
+=head2 Test lib/posix Subtest 9 Fails In LP64-Configured HP-UX
+
+If perl is configured with -Duse64bitall, the successful result of the
+subtest 10 of lib/posix may arrive before the successful result of the
+subtest 9, which confuses the test harness so much that it thinks the
+subtest 9 failed.
+
+=head2 lib/b test 19
+
+The test fails on various platforms (PA64 and IA64 are known), but the
+exact cause is still being investigated.
+
+=head2 Linux With Sfio Fails op/misc Test 48
+
+No known fix.
=head2 sigaction test 13 in VMS
-The test is known to fail, whether it's because of VMS of because
-of faulty test, is not known.
+The test is known to fail; whether it's because of VMS of because
+of faulty test is not known.
=head2 sprintf tests 129 and 130
-The op/sprintf tests 129 and 130 are known to fail in some platforms.
-Examples include any platform using sfio, and Tandem's NonStop-UX.
+The op/sprintf tests 129 and 130 are known to fail on some platforms.
+Examples include any platform using sfio, and Compaq/Tandem's NonStop-UX.
The failing platforms do not comply with the ANSI C Standard, line
19ff on page 134 of ANSI X3.159 1989 to be exact. (They produce
something else than "1" and "-1" when formatting 0.6 and -0.6 using
the printf format "%.0f", most often they produce "0" and "-0".)
+=head2 Failure of Thread tests
+
+The subtests 19 and 20 of lib/thr5005.t test are known to fail due to
+fundamental problems in the 5.005 threading implementation. These are
+not new failures--Perl 5.005_0x has the same bugs, but didn't have
+these tests. (Note that support for 5.005-style threading remains
+experimental.)
+
+=head2 Localising a Tied Variable Leaks Memory
+
+ use Tie::Hash;
+ tie my %tie_hash => 'Tie::StdHash';
+
+ ...
+
+ local($tie_hash{Foo}) = 1; # leaks
+
+Code like the above is known to leak memory every time the local()
+is executed.
+
=head2 Self-tying of Arrays and Hashes Is Forbidden
Self-tying of arrays and hashes is broken in rather deep and
frustrated at the mysterious results (core dumps, most often) it is
for now forbidden (you will get a fatal error even from an attempt).
+=head2 Building Extensions Can Fail Because Of Largefiles
+
+Some extensions like mod_perl are known to have issues with
+`largefiles', a change brought by Perl 5.6.0 in which file offsets
+default to 64 bits wide, where supported. Modules may fail to compile
+at all or compile and work incorrectly. Currently there is no good
+solution for the problem, but Configure now provides appropriate
+non-largefile ccflags, ldflags, libswanted, and libs in the %Config
+hash (e.g., $Config{ccflags_nolargefiles}) so the extensions that are
+having problems can try configuring themselves without the
+largefileness. This is admittedly not a clean solution, and the
+solution may not even work at all. One potential failure is whether
+one can (or, if one can, whether it's a good idea) link together at
+all binaries with different ideas about file offsets, all this is
+platform-dependent.
+
+=head2 The Compiler Suite Is Still Experimental
+
+The compiler suite is slowly getting better but is nowhere near
+working order yet.
+
=head1 Reporting Bugs
If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
-bug database at http://bugs.perl.org. There may also be
-information at http://www.perl.com/perl/, the Perl Home Page.
+bug database at http://bugs.perl.org/ There may also be
+information at http://www.perl.com/perl/ , the Perl Home Page.
If you believe you have an unreported bug, please run the B<perlbug>
program included with your release. Be sure to trim your bug down
to a tiny but sufficient test case. Your bug report, along with the
output of C<perl -V>, will be sent off to perlbug@perl.org to be
-analyzed by the Perl porting team.
+analysed by the Perl porting team.
=head1 SEE ALSO
https://perl5.git.perl.org / perl5.git / blobdiff