[QGIS-Developer] Crash at application termination on Linux

[Nyall Dawson]

On 2 June 2018 at 22:57, Even Rouault <even.rouault at spatialys.com> wrote:
> Hi,
>
> wondering if I'm the only one in that case, but I get systematic crashes on QGIS exit on Ubuntu 16.04, with master or 2.18 branch
> This is super annoying conceptually, and on practice as well since on master, gdb gets automatically attached to the process, which is slow.
>
> When running under Valgrind, this is typically due to things like the following [1], but this is just an extract of
> a long list of errors.
> There are as many occurences of this as there are static variables using QT data types in QGIS code base.
> I experimented changing a few of them, by changing to static pointers instead, and not as static members, and
> with explicit cleanup() function to reclaim the memory explicitly from QgsApplication::exitQgis().
> This works, but this is super tedious, and I'm wondering if I'm not missing something obvious.
>
> Like if libqgis_core would be deinitialized after libQTCore.
>
> Do other people experiment that issue as well ?
>

I personally haven't seen this on any of the platforms I build on
(which includes Fedora, Ubuntu 18.04, and Windows), but can understand
it would make bug fixing super annoying.

I wonder if using Q_GLOBAL_STATIC would be a good fix here?

Nyall