Perl 5 Porters Mailing List Summary: October 12th-19th

Blog:
http://blogs.perl.org/users/sawyer_x/2015/10/perl-5-porters-mailing-list-summary-october-12th-19th.html

Twitter: https://twitter.com/perl5summaries/status/656379626063798272

                               October 12th-19th

Updates

   Dave Mitchell merged the regular expression substring match optimization
   branch!

   James Keenan cleaned more tickets, namely [1]Perl #117963, [2]Perl
   #120330, and [3]Perl #65052.

   James also updates on [4]Perl #123831 that he is able to successfully
   compile perl on an older Darwin system. The ticket refers to problems in
   some definitions the ICC compiler has which caused problems compiling
   perl.

   Yves Orton is working on resolving what seems to be an infinite recursion
   error in the regex engine, raised by [5]Perl #126182.

   Steve Hay was looking at why [6]bignum, [7]Math::BigInt, and
   [8]Math::BigInt::FastCalc are outdated in core. With input from their
   current maintainer, Peter John Acklam, Steve is going to update them to
   the latest versions available on CPAN.

   Reini Urban has been banned from the p5p mailing list following
   uncivilized behavior displayed on the list. Ricardo Signes asked that
   Reini focus on technical discussions and apologize for the comments made,
   or resign from the list. Following a refusal to comply, Reini was banned.

   Max Maischein provided his work on resolving [9]Perl #125439 for
comments.

   Bulk88 submitted a patch in [10]Perl #126377 to remove an extra stat
call.

   Similar to this, Bulk88 also provided a patch in [11]Perl #126373 to
   reimplement the $^WIN32_SLOPPY_STAT as a magic variable. The ticket
   contains details of the differences before and after in a syscall log.

   Lastly, Bulk88 also provided a patch in [12]Perl #126402 to allow two
perl
   processes to share more memory using const vtables.

   Dagfinn Ilmari Mannsåker submitted a patch in [13]Perl #126374 to fix
   [14]IO::Poll's handling of empty poll arrays.

   Tony Cook [15]provides his 24th Perl 5 Grant Report.

   Jarkko reported in [16]Perl #126396 and then fixed a long double problem
   in IRIX.

   Brian Carpenter reminds the list of null pointer dereferencing bugs,
   [17]Perl #125351, [18]Perl #125540, [19]Perl #126191, and [20]Perl
   #126192.

   Filipe asks in [21]Perl #126403 if a buffered read() call can be smarted
   about the chunk size it uses. He provides examples of having more system
   calls than needed in situations like:

 read( $fh, $buffer, 30000 )

   since read() always uses 8,192 byte chunks nowadays.

Bugs

  Reported bugs

   [22]Perl #126368 refers to a breakage in [23]Filesys::DfPortable.

   [24]Perl #126366, in which we're asked whether Perl works on Windows 10.
   Response: Yes.

   [25]Perl #126376 which displays a problem of goto interfering with a
   $SIG{__DIE__} handler which should be displayed with a __DIE__ handler.

   [26]Perl #126328 refers to a possible inconsistent behavior in the regexp
   engine behavior with different backtracking control verbs.

   [27]Perl #126343 describes a similar scenario in the regex engine.

   [28]Perl #126327 exposes a problem when, in a specific situation, an
   optimization in the regular expression engine does not trigger the *SKIP
   control verb. Yves Orton provides additional information on the original
   considerations and possible ways to resolve this (such as keeping the
   optimization but allowing a user to add a flag to disable it if they need
   to).

   [29]Perl #126405, reported by Dan Collins, contains a fuzzed bug,
   triggered by:

 /(?:.||)(?|)000000000@/

   Dan Collins opened [30]Perl #126404, yet another bug found using fuzzing,
   triggered by:

 00./(?[!()])/

   and was immediately fixed by Karl Williamson.

   Similar to this, Dan also opened [31]Perl #126406, triggered by:

 /.0\N{6,0}0\N{6,0}000000000000000000000000000000000/

   immediately fixed by Karl Williamson.

  Resolved bugs

     * [32]Perl #126229: local and magic variables (local $! = $1).
     * [33]Perl #126180: /(?[\ &!])/ segfault.
     * [34]Perl #126242: NO_HASH_SEED build.
     * [35]Perl #124063: silent flag in make_ext.pl build script.
     * [36]Perl #126152: Compile error after re-running Configure since
       AmigaOS merge.
     * [37]Perl #117433 and [38]Perl #126360: MACOSX_DEPLOYMENT_TARGET
       issues.
     * [39]Perl #126306: OpenBSD errno test failures, mentioned last week.
     * [40]Perl #126082: Set PL_delaymagic in unshift.
     * [41]Perl #126319: Segmentation fault in Perl_sv_catpvn_flags.
     * [42]Perl #126177: (?n) should be documented.
     * [43]Perl #126204: Perl segfaults with a regex_sets error message.
     * [44]Perl #126404: Segfault caused by 00./(?[!()])/.
     * [45]Perl #126406: Segfault caused by ``.

Discussion

   A very nice thank you email from Emmanuel Arias:

     I couldn't be more thankful, thank you very much, guys, every problem
     can be resolved with Perl, it's amazing. Our customers are happy,
and we
     are even more!

     You are great, guys!

   Bulk88 [46]adds more comments on the discussion with Dave Mitchell
   regarding debugging the Save Stack, mentioned last week.

   Steve Hay raised problems compiling [47]Socket on VC6 and pushed a fix by
   Bulk88 to blead.

   Jarkko Hietaniemi [48]shares some insight on problems with MacPorts
   lagging behind new XCode updates.

   More from Jarkko's learning, a [49]warning provided on OpenBSD regarding
   strcat. Detailed comment by Zefram with more context around strcat and
   then OpenBSD thoughts behind the warning and some information from Craig
   A. Berry relating to Perl specifically.

   Sawyer X (yes, me) asked on the behavior of XS subroutines (XSUBs)
   signature checks. For a native C type signature (int, for example), perl
   warns about uninitialized variables when sent undef. Vincent Pit
explained
   this as intended behavior and why.

   However, undef sent when expecting a Perl type which isn't SV * (such as
   CV *) croaks (as it should) but still produces an uninitialized warning.
   Sawyer will attempt to provide a patch to fix this.

   Steve is also [50]reporting several failing tests on GCC Builds.
Bulk88 is
   helping diagnose the causes.

   On Mac OS X Perl has relied on setting MACOSX_DEPLOYMENT_TARGET to 10.3.
   On El Capitan this now fails. The problem generated a long [51]discussion
   including a [52]StackOverflow question and a conversation on a related
   [53]ticket in MacPorts, not to mention tickets [54]Perl #123985 and
   [55]Perl #126360.

   The end result was to use -mmacosx-version-min option, which resolves
   correctly on MAC OS X 10.6 and above. I think Craig A. Berry
   [56]summarized it well.

   Ricardo Signes is asking for an implementation of the [57]long-discussed
   idea of turning use warnings to mean use warnings 'default' in order to
   accommodate additional sets of warnings which will not be turned on
by use
   warnings by default. Two note-worthy emails are the [58]summary of the
   actions required in the patch, by Ævar Arnfjörð Bjarmason, and
   [59]commentary by Aristotle Pagaltzis.

   A conversation regarding [60]Perl #116639, regarding inlined comments in
   regular expressions, had resurfaced. There are two options and the
   [61]discussion is taking place. A summary of the problem is [62]provided
   by Karl Williamson.

   Bulk88 [63]asks about the Onion Sketch. These are two meetings that take
   place between the release manager and the pumpking prior to a perl
   release. They are made public for all to be able to know more about the
   process and what's going on. The last one took place on March 25th.

   And, of course, the new Smart Match proposal by Dave Mitchell is still
   being [64]discussed.

References

   1. https://rt.perl.org/rt3/Ticket/Display.html?id=117963
   2. https://rt.perl.org/Ticket/Display.html?id=120330
   3. https://rt.perl.org/Ticket/Display.html?id=65052
   4. https://rt.perl.org/Ticket/Display.html?id=123831
   5. https://rt.perl.org/Ticket/Display.html?id=126182
   6. https://metacpan.org/pod/bignum
   7. https://metacpan.org/pod/Math::BigInt
   8. https://metacpan.org/pod/Math::BigInt::FastCalc
   9. https://rt.perl.org/Ticket/Display.html?id=125439
  10. https://rt.perl.org/Ticket/Display.html?id=126377
  11. https://rt.perl.org/Ticket/Display.html?id=126373
  12. https://rt.perl.org/Ticket/Display.html?id=126402
  13. https://rt.perl.org/Ticket/Display.html?id=126374
  14. https://metacpan.org/pod/IO::Poll
  15. http://www.nntp.perl.org/group/perl.perl5.porters/231948
  16. https://rt.perl.org/Ticket/Display.html?id=126396
  17. https://rt.perl.org/Ticket/Display.html?id=125351
  18. https://rt.perl.org/Ticket/Display.html?id=125540
  19. https://rt.perl.org/Ticket/Display.html?id=126191
  20. https://rt.perl.org/Ticket/Display.html?id=126192
  21. https://rt.perl.org/Ticket/Display.html?id=126403
  22. https://rt.perl.org/Ticket/Display.html?id=126368
  23. https://metacpan.org/pod/Filesys::DfPortable
  24. https://rt.perl.org/Ticket/Display.html?id=126366
  25. https://rt.perl.org/Ticket/Display.html?id=126376
  26. https://rt.perl.org/Ticket/Display.html?id=126328
  27. https://rt.perl.org/Ticket/Display.html?id=126343
  28. https://rt.perl.org/Ticket/Display.html?id=126327
  29. https://rt.perl.org/Ticket/Display.html?id=126405
  30. https://rt.perl.org/Ticket/Display.html?id=126404
  31. https://rt.perl.org/Ticket/Display.html?id=126406
  32. https://rt.perl.org/Ticket/Display.html?id=126229
  33. https://rt.perl.org/Ticket/Display.html?id=126180
  34. https://rt.perl.org/Ticket/Display.html?id=126242
  35. https://rt.perl.org/Ticket/Display.html?id=124063
  36. https://rt.perl.org/Ticket/Display.html?id=126152
  37. https://rt.perl.org/Ticket/Display.html?id=117433
  38. https://rt.perl.org/Ticket/Display.html?id=126360
  39. https://rt.perl.org/Ticket/Display.html?id=126306
  40. https://rt.perl.org/Ticket/Display.html?id=126082
  41. https://rt.perl.org/Ticket/Display.html?id=126319
  42. https://rt.perl.org/Ticket/Display.html?id=126177
  43. https://rt.perl.org/Ticket/Display.html?id=126204
  44. https://rt.perl.org/Ticket/Display.html?id=126404
  45. https://rt.perl.org/Ticket/Display.html?id=126406
  46. http://www.nntp.perl.org/group/perl.perl5.porters/231885
  47. https://metacpan.org/pod/Socket
  48. http://www.nntp.perl.org/group/perl.perl5.porters/231811
  49. http://www.nntp.perl.org/group/perl.perl5.porters/231883
  50. http://www.nntp.perl.org/group/perl.perl5.porters/231903
  51. http://www.nntp.perl.org/group/perl.perl5.porters/231808
  52.
http://stackoverflow.com/questions/32280732/whats-the-best-way-to-set-macosx-deployment-target/32284231#32284231
  53. https://trac.macports.org/ticket/49273
  54. https://rt.perl.org/Public/Bug/Display.html?id=123985
  55. https://rt.perl.org/Public/Bug/Display.html?id=126360
  56. http://www.nntp.perl.org/group/perl.perl5.porters/231870
  57. http://nntp.perl.org/group/perl.perl5.porters/228400
  58. http://www.nntp.perl.org/group/perl.perl5.porters/231917
  59. http://www.nntp.perl.org/group/perl.perl5.porters/231949
  60. https://rt.perl.org/Public/Bug/Display.html?id=116639
  61. http://www.nntp.perl.org/group/perl.perl5.porters/231777
  62. http://www.nntp.perl.org/group/perl.perl5.porters/231911
  63. http://www.nntp.perl.org/group/perl.perl5.porters/231987
  64. http://www.nntp.perl.org/group/perl.perl5.porters/231622