[Bug 268652] Qt5: Some apps fails to start after upgrading to 5.15.8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268652

--- Comment #57 from Tatsuki Makino <tatsuki_makino at hotmail.com> ---
(In reply to Tomoaki AOKI from comment #56)

That method would include those embedded by -rpath.

It seems that this is the code that will be the reason why the application
binary will eventually look for the plugin library in /usr/local/bin.
https://github.com/qt/qtbase/blob/75ae8869fb171493e4d5163910ef3a2034902c7d/src/corelib/kernel/qcoreapplication.cpp#L2869

It seems that this is the path check for the library.
https://github.com/qt/qtbase/blob/75ae8869fb171493e4d5163910ef3a2034902c7d/src/corelib/plugin/qfactoryloader.cpp#L139

It seems that this is the cause of a piece of the path string being embedded.
https://github.com/qt/qtbase/blob/75ae8869fb171493e4d5163910ef3a2034902c7d/src/corelib/global/qlibraryinfo.cpp#L449

The reason for the fall down to /usr/local/bin/ is being sought when
/usr/local/bin/vlc is launched.
Was /usr/local/lib/qt5/plugins/ included in the search path or not?
Where is it embedded and used?

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