[Octave-bug-tracker] [bug #53841] Could not copy help collection to temporary file. Cannot load sqlite database driver! with Qt 5.12

[Mike Miller]

Update of bug #53841 (project octave):

                  Status:            Works For Me => Confirmed              
             Open/Closed:                  Closed => Open                   
                 Summary: Could not copy help collection to temporary file.
Cannot load sqlite database driver! => Could not copy help collection to
temporary file. Cannot load sqlite database driver! with Qt 5.12

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Follow-up Comment #34:

This bug log is confusing. It was originally about user error, an incomplete
Qt installation causing these error messages in either Qt 4 or Qt 5, solved by
ensuring that QtSql is installed, done.

Now there is a regression with the update to Qt 5.12. I have also seen this on
GNU/Linux with the flatpak build of Octave using Qt 5.12, and rolling back to
Qt 5.11 solves it. So I agree this is a new bug in Qt 5.12, not related to how
this bug report started.

Ignoring that confusion and reopening.

I don't think that making the help directory writeable by any user is a
possible solution, Octave has to be able to run with its entire directory
read-only.

If we are copying the help file to a temporary directory and using that file,
why is this error happening? Where does the real error originate in the Qt
libraries?

Flatpak does not have a working Qt 5.12.1 yet so I can't test to compare it
against 5.12.

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