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diff --git a/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl571delta.pod b/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl571delta.pod deleted file mode 100644 index 56eb74f4b58..00000000000 --- a/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl571delta.pod +++ /dev/null @@ -1,1075 +0,0 @@ -=head1 NAME - -perl571delta - what's new for perl v5.7.1 - -=head1 DESCRIPTION - -This document describes differences between the 5.7.0 release and the -5.7.1 release. - -(To view the differences between the 5.6.0 release and the 5.7.0 -release, see L<perl570delta>.) - -=head1 Security Vulnerability Closed - -(This change was already made in 5.7.0 but bears repeating here.) - -A potential security vulnerability in the optional suidperl component -of Perl was identified in August 2000. suidperl is neither built nor -installed by default. As of April 2001 the only known vulnerable -platform is Linux, most likely all Linux distributions. CERT and -various vendors and distributors have been alerted about the vulnerability. -See http://www.cpan.org/src/5.0/sperl-2000-08-05/sperl-2000-08-05.txt -for more information. - -The problem was caused by Perl trying to report a suspected security -exploit attempt using an external program, /bin/mail. On Linux -platforms the /bin/mail program had an undocumented feature which -when combined with suidperl gave access to a root shell, resulting in -a serious compromise instead of reporting the exploit attempt. If you -don't have /bin/mail, or if you have 'safe setuid scripts', or if -suidperl is not installed, you are safe. - -The exploit attempt reporting feature has been completely removed from -all the Perl 5.7 releases (and will be gone also from the maintenance -release 5.6.1), so that particular vulnerability isn't there anymore. -However, further security vulnerabilities are, unfortunately, always -possible. The suidperl code is being reviewed and if deemed too risky -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/ ). - -=head1 Incompatible Changes - -=over 4 - -=item * - -Although "you shouldn't do that", it was possible to write code that -depends on Perl's hashed key order (Data::Dumper does this). The new -algorithm "One-at-a-Time" produces a different hashed key order. -More details are in L</"Performance Enhancements">. - -=item * - -The list of filenames from glob() (or <...>) is now by default sorted -alphabetically to be csh-compliant. (bsd_glob() does still sort platform -natively, ASCII or EBCDIC, unless GLOB_ALPHASORT is specified.) - -=back - -=head1 Core Enhancements - -=head2 AUTOLOAD Is Now Lvaluable - -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 - -=over 4 - -=item * - -IO is now by default done via PerlIO rather than system's "stdio". -PerlIO allows "layers" to be "pushed" onto a file handle to alter the -handle's behaviour. Layers can be specified at open time via 3-arg -form of open: - - open($fh,'>:crlf :utf8', $path) || ... - -or on already opened handles via extended C<binmode>: - - binmode($fh,':encoding(iso-8859-7)'); - -The built-in layers are: unix (low level read/write), stdio (as in -previous Perls), perlio (re-implementation of stdio buffering in a -portable manner), crlf (does CRLF <=> "\n" translation as on Win32, -but available on any platform). A mmap layer may be available if -platform supports it (mostly UNIXes). - -Layers to be applied by default may be specified via the 'open' pragma. - -See L</"Installation and Configuration Improvements"> for the effects -of PerlIO on your architecture name. - -=item * - -File handles can be marked as accepting Perl's internal encoding of Unicode -(UTF-8 or UTF-EBCDIC depending on platform) by a pseudo layer ":utf8" : - - open($fh,">:utf8","Uni.txt"); - -Note for EBCDIC users: the pseudo layer ":utf8" is erroneously named -for you since it's not UTF-8 what you will be getting but instead -UTF-EBCDIC. See L<perlunicode>, L<utf8>, and -http://www.unicode.org/unicode/reports/tr16/ for more information. -In future releases this naming may change. - -=item * - -File handles can translate character encodings from/to Perl's internal -Unicode form on read/write via the ":encoding()" layer. - -=item * - -File handles can be opened to "in memory" files held in Perl scalars via: - - open($fh,'>', \$variable) || ... - -=item * - -Anonymous temporary files are available without need to -'use FileHandle' or other module via - - open($fh,"+>", undef) || ... - -That is a literal undef, not an undefined value. - -=item * - -The list form of C<open> is now implemented for pipes (at least on UNIX): - - open($fh,"-|", 'cat', '/etc/motd') - -creates a pipe, and runs the equivalent of exec('cat', '/etc/motd') in -the child process. - -=item * - -The following builtin functions are now overridable: chop(), chomp(), -each(), keys(), pop(), push(), shift(), splice(), unshift(). - -=item * - -Formats now support zero-padded decimal fields. - -=item * - -Perl now tries internally to use integer values in numeric conversions -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.) - -=item * - -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 * - -Unicode in general should be now much more usable. Unicode can be -used in hash keys, Unicode in regular expressions should work now, -Unicode in tr/// should work now (though tr/// seems to be a -particularly tricky to get right, so you have been warned) - -=item * - -The Unicode Character Database coming with Perl has been upgraded -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 * - -The Unicode character classes \p{Blank} and \p{SpacePerl} have been -added. "Blank" is like C isblank(), that is, it contains only -"horizontal whitespace" (the space character is, the newline isn't), -and the "SpacePerl" is the Unicode equivalent of C<\s> (\p{Space} -isn't, since that includes the vertical tabulator character, whereas -C<\s> doesn't.) - -=back - -=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 - -=over 4 - -=item * - -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, 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 * - -Cwd has now a split personality: if possible, an extension is used, -(this will hopefully be both faster and more secure and robust) but -if not possible, the familiar Perl library implementation is used. - -=item * - -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), by Gisle Aas, -has been added. - - use Digest::MD5 'md5_hex'; - - $digest = md5_hex("Thirsty Camel"); - - print $digest, "\n"; # 01d19d9d2045e005c3f1b80e8b164de1 - -NOTE: the MD5 backward compatibility module is deliberately not -included since its use is discouraged. - -See L<Digest::MD5> for more information. - -=item * - -Encode, by Nick Ing-Simmons, provides a mechanism to translate -between different character encodings. Support for Unicode, -ISO-8859-*, ASCII, CP*, KOI8-R, and three variants of EBCDIC are -compiled in to the module. Several other encodings (like Japanese, -Chinese, and MacIntosh encodings) are included and will be loaded at -runtime. - -Any encoding supported by Encode module is also available to the -":encoding()" layer if PerlIO is used. - -See L<Encode> for more information. - -=item * - -Filter::Simple is an easy-to-use frontend to Filter::Util::Call, -from Damian Conway. - - # in MyFilter.pm: - - package MyFilter; - - use Filter::Simple sub { - while (my ($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, by Paul Marquess, provides you with the -framework to write I<Source Filters> in Perl. For most uses -the frontend Filter::Simple is to be preferred. -See L<Filter::Util::Call> for more information. - -=item * - -Locale::Constants, Locale::Country, Locale::Currency, and Locale::Language, -from Neil Bowers, have been added. They provide the codes for various -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, 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, 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)",$path) - -See L<MIME::QuotedPrint> for more information. - -=item * - -PerlIO::Scalar, by Nick Ing-Simmons, provides the implementation of -IO to "in memory" Perl scalars as discussed above. It also serves as -an example of a loadable layer. Other future possibilities include -PerlIO::Array and PerlIO::Code. See L<PerlIO::Scalar> for more -information. - -=item * - -PerlIO::Via, by Nick Ing-Simmons, acts as a PerlIO layer and wraps -PerlIO layer functionality provided by a class (typically implemented -in perl code). - - use MIME::QuotedPrint; - open($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, 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. Just by saying - - use Switch; - -you have C<switch> and C<case> available in Perl. - - use Switch; - - 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, by Edward Avis, allows storing hash references -(unlike the standard Tie::RefHash) The module is contained within -Tie::RefHash. - -=item * - -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 - -=head2 Updated And Improved Modules and Pragmata - -=over 4 - -=item * - -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 can now define the classes in compile time. - -=item * - -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 * - -Devel::Peek now has an interface for the Perl memory statistics -(this works only if you are using perl's malloc, and if you have -compiled with debugging). - -=item * - -IO::Socket has now atmark() method, which returns true if the socket -is positioned at the out-of-band mark. The method is also exportable -as a sockatmark() function. - -=item * - -IO::Socket::INET has support for ReusePort option (if your platform -supports it). The Reuse option now has an alias, ReuseAddr. For clarity -you may want to prefer ReuseAddr. - -=item * - -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 * - -The C<open> pragma allows layers other than ":raw" and ":crlf" when -using PerlIO. - -=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 * - -The Test module has been significantly enhanced. Its use is -greatly recommended for module writers. - -=item * - -The utf8:: name space (as in the pragma) provides various -Perl-callable functions to provide low level access to Perl's -internal Unicode representation. At the moment only length() -has been implemented. - -=back - -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 - -=over 4 - -=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 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 * - -unshift() should now be noticeably faster. - -=back - -=head1 Utility Changes - -=over 4 - -=item * - -h2xs now produces template README. - -=item * - -s2p has been completely rewritten in Perl. (It is in fact a full -implementation of sed in Perl.) - -=item * - -xsubpp now supports OUT keyword. - -=back - -=head1 New Documentation - -=head2 perlclib - -Internal replacements for standard C library functions. -(Interesting only for extension writers and Perl core hackers.) - -=head2 perliol - -Internals of PerlIO with layers. - -=head2 README.aix - -Documentation on compiling Perl on AIX has been added. AIX has -several different C compilers and getting the right patch level -is essential. On install README.aix will be installed as L<perlaix>. - -=head2 README.bs2000 - -Documentation on compiling Perl on the POSIX-BC platform (an EBCDIC -mainframe environment) has been added. - -This was formerly known as README.posix-bc but the name was considered -to be too confusing (it has nothing to do with the POSIX module or the -POSIX standard). On install README.bs2000 will be installed as L<perlbs2000>. - -=head2 README.macos - -In perl 5.7.1 (and in the 5.6.1) the MacPerl sources have been -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>. - -=head2 README.mpeix - -The README.mpeix has been podified, which means that this information -about compiling and using Perl on the MPE/iX miniframe platform will -be installed as L<perlmpeix>. - -=head2 README.solaris - -README.solaris has been created and Solaris wisdom from elsewhere -in the Perl documentation has been collected there. On install -README.solaris will be installed as L<perlsolaris>. - -=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 be installed as L<perlvos>. - -=head2 Porting/repository.pod - -Documentation on how to use the Perl source repository has been added. - -=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. (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 -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 * - -AIX dynamic loading should be now better supported. - -=item * - -After a long pause, AmigaOS has been verified to be happy with Perl. - -=item * - -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 synchronised) - -=item * - -NCR MP-RAS is now supported. - -=item * - -NonStop-UX is now supported. - -=item * - -Amdahl UTS is now supported. - -=item * - -z/OS (formerly known as OS/390, formerly known as MVS OE) has now -support for dynamic loading. This is not selected by default, -however, you must specify -Dusedl in the arguments of Configure. - -=back - -=head2 Generic Improvements - -=over 4 - -=item * - -Configure no longer includes the DBM libraries (dbm, gdbm, db, ndbm) -when building the Perl binary. The only exception to this is SunOS 4.x, -which needs them. - -=item * - -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 * - -Removed Configure symbols: the PDP-11 memory model settings: huge, -large, medium, models. - -=item * - -SOCKS support is now much more robust. - -=item * - -If your file system supports symbolic links you can build Perl outside -of the source directory by - - mkdir perl/build/directory - cd perl/build/directory - sh /path/to/perl/source/Configure -Dmksymlinks ... - -This will create in perl/build/directory a tree of symbolic links -pointing to files in /path/to/perl/source. The original files are left -unaffected. After Configure has finished you can just say - - make all test - -and Perl will be built and tested, all in perl/build/directory. - -=back - -=head1 Selected Bug Fixes - -Numerous memory leaks and uninitialized memory accesses have been hunted down. -Most importantly anonymous subs used to leak quite a bit. - -=over 4 - -=item * - -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 * - -mkdir() now ignores trailing slashes in the directory name, -as mandated by POSIX. - -=item * - -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 * - -All but the first argument of the IO syswrite() method are now optional. - -=item * - -Tie::ARRAY SPLICE method was broken. - -=item * - -vec() now tries to work with characters <= 255 when possible, but it leaves -higher character values in place. In that case, if vec() was used to modify -the string, it is no longer considered to be utf8-encoded. - -=back - -=head2 Platform Specific Changes and Fixes - -=over 4 - -=item * - -Linux previously had problems related to sockaddrlen when using -accept(), revcfrom() (in Perl: recv()), getpeername(), and getsockname(). - -=item * - -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 - -=head1 New or Changed Diagnostics - -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 -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 index -is made, a warning is given. - -=item * - -C<push @a;> and C<unshift @a;> (with no values to push or unshift) -now give a warning. This may be a problem for generated and eval'ed -code. - -=back - -=head1 Changed Internals - -=over 4 - -=item * - -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 (because it's -a no-op) and the latter replaced with dSP. - -=item * - -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 - -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. - -=head2 AIX vac 5.0.0.0 May Produce Buggy Code For Perl - -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. - -=head2 lib/ftmp-security tests warn 'system possibly insecure' - -Don't panic. Read INSTALL 'make test' section instead. - -=head2 lib/io_multihomed Fails In LP64-Configured HP-UX - -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. - -=head2 sprintf tests 129 and 130 - -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 -hard-to-fix ways. As a stop-gap measure to avoid people from getting -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. - -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 -analysed by the Perl porting team. - -=head1 SEE ALSO - -The F<Changes> file for exhaustive details on what changed. - -The F<INSTALL> file for how to build Perl. - -The F<README> file for general stuff. - -The F<Artistic> and F<Copying> files for copyright information. - -=head1 HISTORY - -Written by Jarkko Hietaniemi <F<jhi@iki.fi>>, with many contributions -from The Perl Porters and Perl Users submitting feedback and patches. - -Send omissions or corrections to <F<perlbug@perl.org>>. - -=cut |