perl5221delta(1)

1PERL5221DELTA(1)       Perl Programmers Reference Guide       PERL5221DELTA(1)
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NAME

6       perl5221delta - what is new for perl v5.22.1
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DESCRIPTION

9       This document describes differences between the 5.22.0 release and the
10       5.22.1 release.
11
12       If you are upgrading from an earlier release such as 5.20.0, first read
13       perl5220delta, which describes differences between 5.20.0 and 5.22.0.
14

Incompatible Changes

16       There are no changes intentionally incompatible with 5.20.0 other than
17       the following single exception, which we deemed to be a sensible change
18       to make in order to get the new "\b{wb}" and (in particular) "\b{sb}"
19       features sane before people decided they're worthless because of bugs
20       in their Perl 5.22.0 implementation and avoided them in the future.  If
21       any others exist, they are bugs, and we request that you submit a
22       report.  See "Reporting Bugs" below.
23
24   Bounds Checking Constructs
25       Several bugs, including a segmentation fault, have been fixed with the
26       bounds checking constructs (introduced in Perl 5.22) "\b{gcb}",
27       "\b{sb}", "\b{wb}", "\B{gcb}", "\B{sb}", and "\B{wb}".  All the "\B{}"
28       ones now match an empty string; none of the "\b{}" ones do.  [perl
29       #126319] <https://rt.perl.org/Ticket/Display.html?id=126319>
30

Modules and Pragmata

32   Updated Modules and Pragmata
33       ·   Module::CoreList has been upgraded from version 5.20150520 to
34           5.20151213.
35
36       ·   PerlIO::scalar has been upgraded from version 0.22 to 0.23.
37
38       ·   POSIX has been upgraded from version 1.53 to 1.53_01.
39
40           If "POSIX::strerror" was passed $! as its argument then it
41           accidentally cleared $!.  This has been fixed.  [perl #126229]
42           <https://rt.perl.org/Ticket/Display.html?id=126229>
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44       ·   Storable has been upgraded from version 2.53 to 2.53_01.
45
46       ·   warnings has been upgraded from version 1.32 to 1.34.
47
48           The "warnings::enabled" example now actually uses
49           "warnings::enabled".  [perl #126051]
50           <https://rt.perl.org/Ticket/Display.html?id=126051>
51
52       ·   Win32 has been upgraded from version 0.51 to 0.52.
53
54           This has been updated for Windows 8.1, 10 and 2012 R2 Server.
55

Documentation

57   Changes to Existing Documentation
58       perltie
59
60       ·   The usage of "FIRSTKEY" and "NEXTKEY" has been clarified.
61
62       perlvar
63
64       ·   The specific true value of $!{E...} is now documented, noting that
65           it is subject to change and not guaranteed.
66

Diagnostics

68       The following additions or changes have been made to diagnostic output,
69       including warnings and fatal error messages.  For the complete list of
70       diagnostic messages, see perldiag.
71
72   Changes to Existing Diagnostics
73       ·   The "printf" and "sprintf" builtins are now more careful about the
74           warnings they emit: argument reordering now disables the "redundant
75           argument" warning in all cases.  [perl #125469]
76           <https://rt.perl.org/Ticket/Display.html?id=125469>
77

Configuration and Compilation

79       ·   Using the "NO_HASH_SEED" define in combination with the default
80           hash algorithm "PERL_HASH_FUNC_ONE_AT_A_TIME_HARD" resulted in a
81           fatal error while compiling the interpreter, since Perl 5.17.10.
82           This has been fixed.
83
84       ·   Configuring with ccflags containing quotes (e.g.
85           "-Accflags='-DAPPLLIB_EXP=\"/usr/libperl\"'") was broken in Perl
86           5.22.0 but has now been fixed again.  [perl #125314]
87           <https://rt.perl.org/Ticket/Display.html?id=125314>
88

Platform Support

90   Platform-Specific Notes
91       IRIX
92           ·   Under some circumstances IRIX stdio fgetc() and fread() set the
93               errno to "ENOENT", which made no sense according to either IRIX
94               or POSIX docs.  Errno is now cleared in such cases.  [perl
95               #123977] <https://rt.perl.org/Ticket/Display.html?id=123977>
96
97           ·   Problems when multiplying long doubles by infinity have been
98               fixed.  [perl #126396]
99               <https://rt.perl.org/Ticket/Display.html?id=126396>
100
101           ·   All tests pass now on IRIX with the default build
102               configuration.
103

Selected Bug Fixes

105       ·   "qr/(?[ () ])/" no longer segfaults, giving a syntax error message
106           instead.  [perl #125805]
107           <https://rt.perl.org/Ticket/Display.html?id=125805>
108
109       ·   Regular expression possessive quantifier Perl 5.20 regression now
110           fixed.  "qr/"PAT"{"min,max"}+""/" is supposed to behave identically
111           to "qr/(?>"PAT"{"min,max"})/".  Since Perl 5.20, this didn't work
112           if min and max were equal.  [perl #125825]
113           <https://rt.perl.org/Ticket/Display.html?id=125825>
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115       ·   Certain syntax errors in "Extended Bracketed Character Classes" in
116           perlrecharclass caused panics instead of the proper error message.
117           This has now been fixed.  [perl #126481]
118           <https://rt.perl.org/Ticket/Display.html?id=126481>
119
120       ·   "BEGIN <>" no longer segfaults and properly produces an error
121           message.  [perl #125341]
122           <https://rt.perl.org/Ticket/Display.html?id=125341>
123
124       ·   A regression from Perl 5.20 has been fixed, in which some syntax
125           errors in "(?[...])" constructs within regular expression patterns
126           could cause a segfault instead of a proper error message.  [perl
127           #126180] <https://rt.perl.org/Ticket/Display.html?id=126180>
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129       ·   Another problem with "(?[...])"  constructs has been fixed wherein
130           things like "\c]" could cause panics.  [perl #126181]
131           <https://rt.perl.org/Ticket/Display.html?id=126181>
132
133       ·   In Perl 5.22.0, the logic changed when parsing a numeric parameter
134           to the -C option, such that the successfully parsed number was not
135           saved as the option value if it parsed to the end of the argument.
136           [perl #125381] <https://rt.perl.org/Ticket/Display.html?id=125381>
137
138       ·   Warning fatality is now ignored when rewinding the stack.  This
139           prevents infinite recursion when the now fatal error also causes
140           rewinding of the stack.  [perl #123398]
141           <https://rt.perl.org/Ticket/Display.html?id=123398>
142
143       ·   A crash with "%::=(); J->${\"::"}" has been fixed.  [perl #125541]
144           <https://rt.perl.org/Ticket/Display.html?id=125541>
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146       ·   Nested quantifiers such as "/.{1}??/" should cause perl to throw a
147           fatal error, but were being silently accepted since Perl 5.20.0.
148           This has been fixed.  [perl #126253]
149           <https://rt.perl.org/Ticket/Display.html?id=126253>
150
151       ·   Regular expression sequences such as "/(?i/" (and similarly with
152           other recognized flags or combination of flags) should cause perl
153           to throw a fatal error, but were being silently accepted since Perl
154           5.18.0.  This has been fixed.  [perl #126178]
155           <https://rt.perl.org/Ticket/Display.html?id=126178>
156
157       ·   A bug in hexadecimal floating point literal support meant that
158           high-order bits could be lost in cases where mantissa overflow was
159           caused by too many trailing zeros in the fractional part.  This has
160           been fixed.  [perl #126582]
161           <https://rt.perl.org/Ticket/Display.html?id=126582>
162
163       ·   Another hexadecimal floating point bug, causing low-order bits to
164           be lost in cases where the last hexadecimal digit of the mantissa
165           has bits straddling the limit of the number of bits allowed for the
166           mantissa, has also been fixed.  [perl #126586]
167           <https://rt.perl.org/Ticket/Display.html?id=126586>
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169       ·   Further hexadecimal floating point bugs have been fixed: In some
170           circumstances, the %a format specifier could variously lose the
171           sign of the negative zero, fail to display zeros after the radix
172           point with the requested precision, or even lose the radix point
173           after the leftmost hexadecimal digit completely.
174
175       ·   A crash caused by incomplete expressions within "/(?[ ])/" (e.g.
176           "/(?[[0]+()+])/") has been fixed.  [perl #126615]
177           <https://rt.perl.org/Ticket/Display.html?id=126615>
178

Acknowledgements

180       Perl 5.22.1 represents approximately 6 months of development since Perl
181       5.22.0 and contains approximately 19,000 lines of changes across 130
182       files from 27 authors.
183
184       Excluding auto-generated files, documentation and release tools, there
185       were approximately 1,700 lines of changes to 44 .pm, .t, .c and .h
186       files.
187
188       Perl continues to flourish into its third decade thanks to a vibrant
189       community of users and developers.  The following people are known to
190       have contributed the improvements that became Perl 5.22.1:
191
192       Aaron Crane, Abigail, Andy Broad, Aristotle Pagaltzis, Chase Whitener,
193       Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan, David Mitchell,
194       Father Chrysostomos, Herbert Breunung, Hugo van der Sanden, James E
195       Keenan, Jan Dubois, Jarkko Hietaniemi, Karen Etheridge, Karl
196       Williamson, Lukas Mai, Matthew Horsfall, Peter Martini, Rafael Garcia-
197       Suarez, Ricardo Signes, Shlomi Fish, Sisyphus, Steve Hay, Tony Cook,
198       Victor Adam.
199
200       The list above is almost certainly incomplete as it is automatically
201       generated from version control history.  In particular, it does not
202       include the names of the (very much appreciated) contributors who
203       reported issues to the Perl bug tracker.
204
205       Many of the changes included in this version originated in the CPAN
206       modules included in Perl's core.  We're grateful to the entire CPAN
207       community for helping Perl to flourish.
208
209       For a more complete list of all of Perl's historical contributors,
210       please see the AUTHORS file in the Perl source distribution.
211

Reporting Bugs

213       If you find what you think is a bug, you might check the articles
214       recently posted to the comp.lang.perl.misc newsgroup and the perl bug
215       database at https://rt.perl.org/ .  There may also be information at
216       http://www.perl.org/ , the Perl Home Page.
217
218       If you believe you have an unreported bug, please run the perlbug
219       program included with your release.  Be sure to trim your bug down to a
220       tiny but sufficient test case.  Your bug report, along with the output
221       of "perl -V", will be sent off to perlbug@perl.org to be analysed by
222       the Perl porting team.
223
224       If the bug you are reporting has security implications, which make it
225       inappropriate to send to a publicly archived mailing list, then please
226       send it to perl5-security-report@perl.org.  This points to a closed
227       subscription unarchived mailing list, which includes all the core
228       committers, who will be able to help assess the impact of issues,
229       figure out a resolution, and help co-ordinate the release of patches to
230       mitigate or fix the problem across all platforms on which Perl is
231       supported.  Please only use this address for security issues in the
232       Perl core, not for modules independently distributed on CPAN.
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