qt - error C2440: 'default argument': cannot convert from 'const wchar_t [1]' to 'BSTR'

Question

I am getting below error while using this command qmake.exe project.pro -r -spec win32-msvc2015

C:Program Files (x86)Windows Kits8.1includeummshtml.h(50130): error C2440: 'default argument': cannot convert from 'const wchar_t [1]' to 'BSTR'

and it worked fine with qmake.exe project.pro -r -spec win32-msvc2013

Means it built fine with win32-msvc2013 but not win32-msvc2015. I have added below line in the project file and after that it I was able to build in 2013 but Not in 2015.

win32: QMAKE_CXXFLAGS_RELEASE -= -Zc:strictStrings 

Any one have idea on this that what it needing for 2015?

Answer 1

It's because some Windows headers violate strictStrings rules. You could try loosening checking even more:

win32: QMAKE_CXXFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS -= -Zc:strictStrings
win32: QMAKE_CXXFLAGS -= -Zc:strictStrings