When trying to configure using Visual Studio 2012 for 64-bit builds, qmake will compile but will not run properly. The following output is generated:

ASSERT: "&other != this" in file c:\work\build\qt\qtbase\include\qtcore\../../src/corelib/tools/qstring.h, line 756
QMake failed!
+ C:/work/build/qt/qtbase/bin/qmake C:/work/build/qt/qt.pro
ASSERT: "&other != this" in file c:\work\build\qt\qtbase\include\qtcore\../../src/corelib/tools/qstring.h, line 756

If I configure for a 32-bit build, the error does not occur.

This was found when trying to merge https://codereview.qt-project.org/#change,46574 into the dev branch. The following is the log that was produced by the CI system providing more information:

http://testresults.qt-project.org/ci/QtBase_dev_Integration/build_00298/win64-msvc2012_developer-build_qtnamespace_Windows_8/log.txt.gz