MSVC 2015 has buggy magic statics, see https://bugreports.qt.io/browse/QTBUG-58318 and https://connect.microsoft.com/VisualStudio/feedback/details/3121209
I worked around the issue by disabling them with -Zc:threadSafeInit-. On Tue, Apr 18, 2017 at 3:46 AM, Kuba Ober <k...@mareimbrium.org> wrote: > Are -static -ltcg -debug-and-release x86 builds tested and supported? It > seems that they are broken on at least MSVC 2015 and 2017, in both 5.7 and > 5.8. That's using most recent production releases of either version of MSVC > (no prereleases etc), and I build using most recent jom. > > For me; 5.8 in a debug build corrupts the heap early during static > initialization and doesn't even get to main's body. A release build is will > generally crash somewhere but due to lack of heap diagnostics it will get to > run first, on a partially corrupted heap. > > 5.7 crashes in the release if you as much as use add a shortcut to a dummy > widget and then return from main. Seems to be a different face of the same > problem, although the debug version didn't crash. > > IIRC 5.6 was also crashing for me. > > Since this is reproducible on 2 different machines, and seems to point to a > persistent problem - did anyone else run into it? > > I will file bug reports but would want to know first whether it's anything > known. To be completely frank, I couldn't get any Qt version between 5.6 and > 5.8, inclusive, to work under either MSVC 2015 or 2017 with -static -ltcg so > it seems like an untested configuration that's exposing undefined behavior > somewhere as the whole thing is globally optimized. > > I kinda need this to work. Unless I hear better ideas, I plan on stripping > away code to see what it takes to make it not crash. With 5.8 it crashes even > with no plugins linked in, the heap corruption is detected in a heap free > from one of the Q_GLOBAL_STATICs in somewhere in Qt. > > Cheers, Kuba Ober > _______________________________________________ > Development mailing list > Development@qt-project.org > http://lists.qt-project.org/mailman/listinfo/development _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
