3 perldelta - what's new for perl5.006 (as of 5.005_54)
7 This document describes differences between the 5.005 release and this one.
9 =head1 Incompatible Changes
11 =head2 Perl Source Incompatibilities
13 None known at this time.
15 =head2 C Source Incompatibilities
21 Release 5.005 grandfathered old global symbol names by providing preprocessor
22 macros for extension source compatibility. As of release 5.006, these
23 preprocessor definitions are not available by default. You need to explicitly
24 compile perl with C<-DPERL_POLLUTE> in order to get these definitions.
26 =item C<PL_na> and C<dTHR> Issues
28 The C<PL_na> global is now thread local, so a C<dTHR> declaration is needed
29 in the scope in which it appears. XSUBs should handle this automatically,
30 but if you have used C<PL_na> in support functions, you either need to
31 change the C<PL_na> to a local variable (which is recommended), or put in
36 =head2 Binary Incompatibilities
38 This release is not binary compatible with the 5.005 release and its
43 =head2 Binary numbers supported
45 Binary numbers are now supported as literals, in s?printf formats, and
49 printf "The answer is: %b\n", oct("0b101010");
51 =head2 syswrite() ease-of-use
53 The length argument of C<syswrite()> is now optional.
57 Better 64-bit support -- but full support still a distant goal. One
58 must Configure with -Duse64bits to get Configure to probe for the
59 extent of 64-bit support. Depending on the platform (hints file) more
60 or less 64-awareness becomes available. As of 5.005_54 at least
61 somewhat 64-bit aware platforms are HP-UX 11 or better, Solaris 2.6 or
62 better, IRIX 6.2 or better. Naturally 64-bit platforms like Digital
63 UNIX and UNICOS also have 64-bit support.
65 =head1 Supported Platforms
71 VM/ESA is now supported.
75 Siemens BS200 is now supported.
79 The Mach CThreads (NeXTstep) are now supported by the Thread extension.
89 IO constants (SEEK_*, _IO*).
93 Directory-related IO methods (new, read, close, rewind, tied delete).
95 =item op/io_multihomed
97 INET sockets with multi-homed hosts.
113 Verify operations that access pad objects (lexicals and temporaries).
117 =head1 Modules and Pragmata
125 Added Dumpvalue module provides screen dumps of Perl data.
129 You can now run tests for I<x> seconds instead of guessing the right
130 number of tests to run.
134 More Fcntl constants added: F_SETLK64, F_SETLKW64, O_LARGEFILE for
135 large (more than 4G) file access (the 64-bit support is not yet
136 working, though, so no need to get overly excited), Free/Net/OpenBSD
137 locking behaviour flags F_FLOCK, F_POSIX, Linux F_SHLCK, and
138 O_ACCMODE: the mask of O_RDONLY, O_WRONLY, and O_RDWR.
142 The accessors methods Re, Im, arg, abs, rho, theta, methods can
143 ($z->Re()) now also act as mutators ($z->Re(3)).
147 A little bit of radial trigonometry (cylindrical and spherical) added,
148 for example the great circle distance.
154 Lexical warnings pragma, "use warning;", to control optional warnings.
156 Filetest pragma, to control the behaviour of filetests (C<-r> C<-w> ...).
157 Currently only one subpragma implemented, "use filetest 'access';",
158 that enables the use of access(2) or equivalent to check the
159 permissions instead of using stat(2) as usual. This matters
160 in filesystems where there are ACLs (access control lists), the
161 stat(2) might lie, while access(2) knows better.
163 =head1 Utility Changes
167 =head1 Documentation Changes
171 =item perlopentut.pod
173 A tutorial on using open() effectively.
177 A tutorial that introduces the essentials of references.
181 =head1 New Diagnostics
183 =item /%s/: Unrecognized escape \\%c passed through
185 (W) You used a backslash-character combination which is not recognized
186 by Perl. This combination appears in an interpolated variable or a
187 C<'>-delimited regular expression.
189 =item Unrecognized escape \\%c passed through
191 (W) You used a backslash-character combination which is not recognized
194 =item Missing command in piped open
196 (W) You used the C<open(FH, "| command")> or C<open(FH, "command |")>
197 construction, but the command was missing or blank.
199 =head1 Obsolete Diagnostics
203 =head1 Configuration Changes
205 You can use "Configure -Uinstallusrbinperl" which causes installperl
206 to skip installing perl also as /usr/bin/perl. This is useful if you
207 prefer not to modify /usr/bin for some reason or another but harmful
208 because many scripts assume to find Perl in /usr/bin/perl.
210 =head1 Configuration Changes
212 You can use "Configure -Uinstallusrbinperl" which causes installperl
213 to skip installing perl also as /usr/bin/perl. This is useful if you
214 prefer not to modify /usr/bin for some reason or another but harmful
215 because many scripts assume to find Perl in /usr/bin/perl.
219 If you find what you think is a bug, you might check the headers of
220 recently posted articles in the comp.lang.perl.misc newsgroup.
221 There may also be information at http://www.perl.com/perl/, the Perl
224 If you believe you have an unreported bug, please run the B<perlbug>
225 program included with your release. Make sure you trim your bug down
226 to a tiny but sufficient test case. Your bug report, along with the
227 output of C<perl -V>, will be sent off to <F<perlbug@perl.com>> to be
228 analysed by the Perl porting team.
232 The F<Changes> file for exhaustive details on what changed.
234 The F<INSTALL> file for how to build Perl.
236 The F<README> file for general stuff.
238 The F<Artistic> and F<Copying> files for copyright information.
242 Written by Gurusamy Sarathy <F<gsar@umich.edu>>, with many contributions
243 from The Perl Porters.
245 Send omissions or corrections to <F<perlbug@perl.com>>.