Re: qt6 6.11.0 is broken (or qgis 4 has a latent bug, seems less likely)

[Mark Davies <mark%some.addr.nz@localhost>]

On 12/05/2026 10:09, Greg Troxel wrote:
> Yesterday I wrote that starting up qgis 4.0.2(+18 commits) (from
> wip/qgis) resulted in a crash.   It turns out the thing that matters for
> crash vs works is not qgis version, but qt6 version.

> 4.0.0	6.11.0	crashes on opening project file
> 4.0.2	6.11.0	crashes on opening project file

Just on the off chance is this relevant:

 From: Akseli Lahtinen <akselmo%akselmo.dev@localhost>
 To: distributions%kde.org@localhost
 Subject: Backport fix for crashes in QFontEngineFT::loadGlyph

 Hi

 In some cases, applications may crash when the fontEngine is loading 
glyphs.
 Backporting this Qt fix should help:
 https://codereview.qt-project.org/c/qt/qtbase/+/724504

 Example bug reports:
 - https://bugs.kde.org/show_bug.cgi?id=518105
 - https://bugs.kde.org/show_bug.cgi?id=519722

 Best regards,
 - Akseli


cheers
mark