This is known problem. See https://bugreports.qt-project.org/browse/QTBUG-29099. It for Qt5 but for Qt4 is the same. You can't now use -O3 with mingw toolchains based on gcc-4.7.3+.
Regards, Alexey. 2013/7/3 Haroogan <haroo...@gmail.com>: > Hello, > > > The problem is as follows. > Building Qt 4.8.5 with x64-4.8.0-release-posix-seh-rev2 (from the > MinGW-builds project) distribution and supplying -O3 optimization flag > results in QtCore4.dll crashing very frequently (almost always). > > Rebuilding QtCore4.dll with -O2 optimization flag immediately solves the > issue. > Of course the debug variant QtCored4.dll works just fine (as only -g is > supplied). > Please, look into it. > In particular, does the issue show up for the newest 4.8.1 releases? > If not, then I guess we shouldn't worry much as it is fixed, otherwise it > should definitely be investigated. > > Currently, I haven't time to try 4.8.1 out myself. > Why do I consider it as regression? > Obviously because it was not the case with MinGW-w64 based on GCC 4.7.1. > > Kind regards, > Haroogan > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Mingw-w64-public mailing list > Mingw-w64-public@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public > ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
