1PERL5122DELTA(1) Perl Programmers Reference Guide PERL5122DELTA(1)
2
6 perl5122delta - what is new for perl v5.12.2
7
9 This document describes differences between the 5.12.1 release and the
10 5.12.2 release.
11 If you are upgrading from an earlier major version, such as 5.10.1,
13 first read perl5120delta, which describes differences between 5.10.1
14 and 5.12.0, as well as perl5121delta, which describes earlier changes
15 in the 5.12 stable release series.
16
18 There are no changes intentionally incompatible with 5.12.1. If any
19 exist, they are bugs and reports are welcome.
20
22 Other than the bug fixes listed below, there should be no user-visible
23 changes to the core language in this release.
24
26 New Modules and Pragmata
27 This release does not introduce any new modules or pragmata.
28 Pragmata Changes
30 In the previous release, "no VERSION;" statements triggered a bug which
31 could cause feature bundles to be loaded and strict mode to be enabled
32 unintentionally.
33 Updated Modules
35 "Carp"
36 Upgraded from version 1.16 to 1.17.
37 Carp now detects incomplete caller() overrides and avoids using
39 bogus @DB::args. To provide backtraces, Carp relies on particular
40 behaviour of the caller built-in. Carp now detects if other code
41 has overridden this with an incomplete implementation, and modifies
42 its backtrace accordingly. Previously incomplete overrides would
43 cause incorrect values in backtraces (best case), or obscure fatal
44 errors (worst case)
45 This fixes certain cases of "Bizarre copy of ARRAY" caused by
47 modules overriding "caller()" incorrectly.
48 "CPANPLUS"
50 A patch to cpanp-run-perl has been backported from CPANPLUS 0.9004.
51 This resolves RT #55964
52 <http://rt.cpan.org/Public/Bug/Display.html?id=55964> and RT #57106
53 <http://rt.cpan.org/Public/Bug/Display.html?id=57106>, both of
54 which related to failures to install distributions that use
55 "Module::Install::DSL".
56 "File::Glob"
58 A regression which caused a failure to find "CORE::GLOBAL::glob"
59 after loading "File::Glob" to crash has been fixed. Now, it
60 correctly falls back to external globbing via "pp_glob".
61 "File::Copy"
63 "File::Copy::copy(FILE, DIR)" is now documented.
64 "File::Spec"
66 Upgraded from version 3.31 to 3.31_01.
67 Several portability fixes were made in "File::Spec::VMS": a colon
69 is now recognized as a delimiter in native filespecs; caret-escaped
70 delimiters are recognized for better handling of extended
71 filespecs; "catpath()" returns an empty directory rather than the
72 current directory if the input directory name is empty; "abs2rel()"
73 properly handles Unix-style input.
74
76 • perlbug now always gives the reporter a chance to change the email
77 address it guesses for them.
78 • perlbug should no longer warn about uninitialized values when using
80 the "-d" and "-v" options.
81
83 • The existing policy on backward-compatibility and deprecation has
84 been added to perlpolicy, along with definitions of terms like
85 deprecation.
86 • "srand" in perlfunc's usage has been clarified.
88 • The entry for "die" in perlfunc was reorganized to emphasize its
90 role in the exception mechanism.
91 • Perl's INSTALL file has been clarified to explicitly state that
93 Perl requires a C89 compliant ANSI C Compiler.
94 • IO::Socket's "getsockopt()" and "setsockopt()" have been
96 documented.
97 • alarm()'s inability to interrupt blocking IO on Windows has been
99 documented.
100 • Math::TrulyRandom hasn't been updated since 1996 and has been
102 removed as a recommended solution for random number generation.
103 • perlrun has been updated to clarify the behaviour of octal flags to
105 perl.
106 • To ease user confusion, $# and $*, two special variables that were
108 removed in earlier versions of Perl have been documented.
109 • The version of perlfaq shipped with the Perl core has been updated
111 from the official FAQ version, which is now maintained in the
112 "briandfoy/perlfaq" branch of the Perl repository at
113 <git://perl5.git.perl.org/perl.git>.
114
116 Configuration improvements
117 • The "d_u32align" configuration probe on ARM has been fixed.
118 Compilation improvements
120 • An ""incompatible operand types"" error in ternary expressions when
121 building with "clang" has been fixed.
122 • Perl now skips setuid "File::Copy" tests on partitions it detects
124 to be mounted as "nosuid".
125
127 • A possible segfault in the "T_PRTOBJ" default typemap has been
128 fixed.
129 • A possible memory leak when using caller() to set @DB::args has
131 been fixed.
132 • Several memory leaks when loading XS modules were fixed.
134 • "unpack()" now handles scalar context correctly for %32H and %32u,
136 fixing a potential crash. "split()" would crash because the third
137 item on the stack wasn't the regular expression it expected.
138 "unpack("%2H", ...)" would return both the unpacked result and the
139 checksum on the stack, as would "unpack("%2u", ...)". [perl
140 #73814] <http://rt.perl.org/rt3/Ticket/Display.html?id=73814>
141 • Perl now avoids using memory after calling "free()" in pp_require
143 when there are CODEREFs in @INC.
144 • A bug that could cause ""Unknown error"" messages when
146 ""call_sv(code, G_EVAL)"" is called from an XS destructor has been
147 fixed.
148 • The implementation of the "open $fh, '>' \$buffer" feature now
150 supports get/set magic and thus tied buffers correctly.
151 • The "pp_getc", "pp_tell", and "pp_eof" opcodes now make room on the
153 stack for their return values in cases where no argument was passed
154 in.
155 • When matching unicode strings under some conditions inappropriate
157 backtracking would result in a "Malformed UTF-8 character (fatal)"
158 error. This should no longer occur. See [perl #75680]
159 <http://rt.perl.org/rt3/Public/Bug/Display.html?id=75680>
160
162 AIX
163 • README.aix has been updated with information about the XL C/C++ V11
164 compiler suite.
165 Windows
167 • When building Perl with the mingw64 x64 cross-compiler "incpath",
168 "libpth", "ldflags", "lddlflags" and "ldflags_nolargefiles" values
169 in Config.pm and Config_heavy.pl were not previously being set
170 correctly because, with that compiler, the include and lib
171 directories are not immediately below "$(CCHOME)".
172 VMS
174 • git_version.h is now installed on VMS. This was an oversight in
175 v5.12.0 which caused some extensions to fail to build.
176 • Several memory leaks in stat() have been fixed.
178 • A memory leak in "Perl_rename()" due to a double allocation has
180 been fixed.
181 • A memory leak in "vms_fid_to_name()" (used by "realpath()" and
183 "realname()") has been fixed.
184
186 Perl 5.12.2 represents approximately three months of development since
187 Perl 5.12.1 and contains approximately 2,000 lines of changes across
188 100 files from 36 authors.
189 Perl continues to flourish into its third decade thanks to a vibrant
191 community of users and developers. The following people are known to
192 have contributed the improvements that became Perl 5.12.2:
193 Abigail, AEvar Arnfjoerd` Bjarmason, Ben Morrow, brian d foy, Brian
195 Phillips, Chas. Owens, Chris 'BinGOs' Williams, Chris Williams, Craig
196 A. Berry, Curtis Jewell, Dan Dascalescu, David Golden, David Mitchell,
197 Father Chrysostomos, Florian Ragwitz, George Greer, H.Merijn Brand, Jan
198 Dubois, Jesse Vincent, Jim Cromie, Karl Williamson, Lars DXXXXXX XXX,
199 Leon Brocard, Maik Hentsche, Matt S Trout, Nicholas Clark, Rafael
200 Garcia-Suarez, Rainer Tammer, Ricardo Signes, Salvador Ortiz Garcia,
201 Sisyphus, Slaven Rezic, Steffen Mueller, Tony Cook, Vincent Pit and
202 Yves Orton.
203
205 If you find what you think is a bug, you might check the articles
206 recently posted to the comp.lang.perl.misc newsgroup and the perl bug
207 database at http://rt.perl.org/perlbug/ . There may also be
208 information at http://www.perl.org/ , the Perl Home Page.
209 If you believe you have an unreported bug, please run the perlbug
211 program included with your release. Be sure to trim your bug down to a
212 tiny but sufficient test case. Your bug report, along with the output
213 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
214 the Perl porting team.
215 If the bug you are reporting has security implications, which make it
217 inappropriate to send to a publicly archived mailing list, then please
218 send it to perl5-security-report@perl.org. This points to a closed
219 subscription unarchived mailing list, which includes all the core
220 committers, who will be able to help assess the impact of issues,
221 figure out a resolution, and help co-ordinate the release of patches to
222 mitigate or fix the problem across all platforms on which Perl is
223 supported. Please only use this address for security issues in the Perl
224 core, not for modules independently distributed on CPAN.
225
227 The Changes file for an explanation of how to view exhaustive details
228 on what changed.
229 The INSTALL file for how to build Perl.
231 The README file for general stuff.
233 The Artistic and Copying files for copyright information.
235perl v5.32.1 2021-05-31 PERL5122DELTA(1)