bug when build opencv: QT 6.7, UNICODE, __itt_domain_create

[sunqian119]

System Information

OpenCV: 4.9.0
Operating System / Platform: WIN 11 Home
Compiler & compiler version: MSVC 1939
CMake version: 3.29.2

Detailed description

I choose "WITH_QT" (version 6.7.0) and "build_opencv_world" in cmake-gui, part of error logs are as follows:

D:\OPENCV\opencv-4.9.0\modules\core\src\trace.cpp(211,46): error C2664: “__itt_domain *(const wchar_t *)”: 无法将参数 1 从“const char [12]”转换为“const wchar_t *”
D:\OPENCV\opencv-4.9.0\modules\core\src\trace.cpp(211,46):
指向的类型不相关; 转换需要 reinterpret_cast、C 样式强制转换或带圆括号的函数样式强制转换
D:\OPENCV\opencv-4.9.0\modules\core\src\trace.cpp(241,61): error C2664: “__itt_string_handle *(const wchar_t *)”: 无法将参数 1 从“const char *const ”转换为“const wchar_t *”
D:\OPENCV\opencv-4.9.0\modules\core\src\trace.cpp(241,61):
指向的类型不相关; 转换需要 reinterpret_cast、C 样式强制转换或带圆括号的函数样式强制转换

However, everything is fine when I only choose "build_opencv_world" or "WITH_QT".
And in QT assistant, I find that "In Qt 6, the UNICODE and _UNICODE compiler definitions are set by default for targets that link against Qt modules".

Steps to reproduce

choose "WITH_QT" (version 6.7.0) and "build_opencv_world" in cmake-gui

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)

[opencv-alalek]

There are several options:

• try to place qt6_disable_unicode_defines / qt_disable_unicode_defines in CMake for opencv_world target. Docs: https://doc.qt.io/qt-6/qt-disable-unicode-defines.html
• try to #undef UNICODE in the beginning of trace.cpp file

[sunqian119]

There are several options:

• try to place qt6_disable_unicode_defines / qt_disable_unicode_defines in CMake for opencv_world target. Docs: https://doc.qt.io/qt-6/qt-disable-unicode-defines.html
• try to #undef UNICODE in the beginning of trace.cpp file

Thanks anyway. I have added the command at this place and it worked.

Maybe the only one solution is to disable the UNICODE. 😅

[opencv-alalek]

There is still a problem in source code, so lets keep this issue open.