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Diffstat (limited to 'pod/perl571delta.pod')
| -rw-r--r-- | pod/perl571delta.pod | 164 |
1 files changed, 116 insertions, 48 deletions
diff --git a/pod/perl571delta.pod b/pod/perl571delta.pod index 69a3910963..53e498e1e0 100644 --- a/pod/perl571delta.pod +++ b/pod/perl571delta.pod @@ -100,10 +100,11 @@ File handles can be marked as accepting Perl's internal encoding of Unicode open($fh,">:utf8","Uni.txt"); -Note for EBCDIC users: the pseudo layer ":utf8" is badly named for you -since it's not UTF-8 what you will be getting but instead UTF-EBCDIC. -See http://www.unicode.org/unicode/reports/tr16/ for more information. -In future release this naming issue may or may not change. +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 * @@ -199,7 +200,7 @@ C<\s> doesn't.) =item * -B::Concise, from Stephen McCamant, is a new compiler backend for +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. @@ -207,8 +208,8 @@ 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. @@ -227,7 +228,7 @@ 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. use Digest::MD5 'md5_hex'; @@ -243,7 +244,7 @@ See L<Digest::MD5> for more information. =item * -Encode, from Nick Ing-Simmons, provides a mechanism to translate +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, @@ -287,7 +288,7 @@ 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 frontend Filter::Simple is to be preferred. See L<Filter::Util::Call> for more information. @@ -309,7 +310,7 @@ 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; @@ -322,7 +323,7 @@ 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; @@ -342,7 +343,7 @@ See L<MIME::QuotedPrint> for more information. =item * -PerlIO::Scalar, from Nick Ing-Simmons, provides the implementation of +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 @@ -350,7 +351,7 @@ information. =item * -PerlIO::Via, from Nick Ing-Simmons, acts as a PerlIO layer and wraps +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). @@ -362,7 +363,7 @@ 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. @@ -401,24 +402,25 @@ extracting delimited text sequences from strings. ($a, $b) = extract_delimited("'never say never', he never said", "'", ''); -C<$a> will be "'never say never'", C<$b> will be ', he never said'. +$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(). See L<Text::Balanced> for more information. +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 +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 @@ -495,7 +497,7 @@ 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, +CPAN, CGI, DB_File, File::Temp, Getopt::Long, Pod::Man, Pod::Text, Storable, Text-Tabs+Wrap. =head1 Performance Enhancements @@ -505,12 +507,13 @@ Storable, Text-Tabs+Wrap. =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 * @@ -653,9 +656,9 @@ L<perlbs2000> (for POSIX-BC), and L<perlvmesa> for more information. =item * -In HP-UX 10.20 Perl threading is now working with the various threading -packages available for HP-UX. See L<perlhpux> (or in the source -distribution, README.hpux) for more information. +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 * @@ -777,15 +780,15 @@ and Perl will be built and tested, all in /tmp/perl/build/directory. =head1 Selected Bug Fixes -Numerous memory leaks and uninitialized memory leaks have been hunted down. +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. +chop(@list) in list context returned the characters chopped in +reverse order. This has been reversed to be in the right order. =item * @@ -863,6 +866,10 @@ 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). @@ -881,7 +888,7 @@ respectively. =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 * @@ -919,25 +926,45 @@ machines (Perl's malloc is mostly tuned for space). =head1 Known Problems -Notice that this list doesn't contain problems that were present in -5.7.0 and still are there, see L<perl570delta> for those. +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 lib/b test 19 +=head2 AIX vac 5.0.0.0 May Produce Buggy Code For Perl -The test fails in various platforms (PA64 and IA64 are known), but the -exact cause is still being investigated. +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 Localising a Tied Variable Leaks Memory +=head2 lib/ftmp-security tests warn 'system possibly insecure' - use Tie::Hash; - tie my %tie_hash => 'Tie::StdHash'; +Don't panic. Read INSTALL 'make test' section instead. - ... +=head2 lib/io_multihomed Fails In LP64-Configured HP-UX - local($tie_hash{Foo}) = 1; # leaks +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). -Code like the above is known to leak memory every time the local() -is executed. +=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 in 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 @@ -947,12 +974,32 @@ 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. +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 @@ -960,6 +1007,27 @@ 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 |