[clazy] [Bug 408021] New: Warn if code contains the constant 0x9e3779b9 (hand-rolled boost::hash_combine)

[Giuseppe D'Angelo]

https://bugs.kde.org/show_bug.cgi?id=408021

            Bug ID: 408021
           Summary: Warn if code contains the constant 0x9e3779b9
                    (hand-rolled boost::hash_combine)
           Product: clazy
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: dangelog at gmail.com
                CC: smartins at kde.org
  Target Milestone: ---

Check if the code contains the constant "0x9e3779b9".

It's VERY likely someone is hand-rolling QtPrivate::QHashCombine /
boost::hash_combine. Suggest to use those instead.

E.g.
https://codereview.qt-project.org/c/qt/qtbase/+/263115/4/src/network/ssl/qsslerror.cpp#b367

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