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Item7799: TWiki with current Perl: Eliminate warnings

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AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Engine   Normal Closed TWiki:Main.HaraldJoerg minor 6.1.0

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This is a collection of warnings which pop up during tests for TWiki under Perl 5.24. It turns out that a couple of warnings were present (but ignored) in earlier versions, too.
  • Possible precedence issue with control flow operator at /linuxdevel/twiki/trunk/core/lib/TWiki/Attach.pm line 226.
    • This is somewhat serious: The line in question reads return $info->{attr} or " ";. This has always been equivalent to return $info->{attr}; because return has higher precendence than or. The warning came up in Perl 5.20.
    • Since this bad line has apparently been working for ages I'll simply drop the or clause.
    • Done in Rev. 30334. -- TWiki:Main/HaraldJoerg - 2017-05-26
  • Useless use of greediness modifier '?' ... at trunk/core/lib/TWiki/Store/RcsLite.pm line 302.
    • Another new warning in Perl 5.20. I guess it slipped through since RcsLite is rarely used in production. I am using RcsLite quite regularly in my TWikis on Windows and haven't seen any bad effects, and I don't understand what the greediness modifier was supposed to do at all. Therefore I'll simply eliminate it.
    • Done in Rev. 30335. -- TWiki:Main/HaraldJoerg - 2017-05-26
  • Unescaped left brace in regex is deprecated, passed through in regex; ... at CommentPlugin/CommentPluginTests.pm line 224 , 226
    • A special case since the left brace comes in through a variable, so replacing { with \{ isn't applicable. The method \Q$var\E works.
  • TWiki::I18N::_normalize_language_tag should not issue a warning if there's no predefined language

-- TWiki:Main/HaraldJoerg - 2017-04-10

Summary TWiki with current Perl: Eliminate warnings
ReportedBy TWiki:Main.HaraldJoerg
Codebase ~twiki4
SVN Range TWiki-6.0.2-trunk, Fri, 07 Apr 2017, build 30318
AppliesTo Engine

Priority Normal
CurrentState Closed
WaitingFor TWiki:Main.HaraldJoerg
Checkins TWikirev:30327 TWikirev:30335 TWikirev:30336
TargetRelease minor
ReleasedIn 6.1.0
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Topic revision: r9 - 2018-07-17 - PeterThoeny
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