build error "unknown argument: '-permissive-'" on cmake / msvc 2019

C:\Qt\Examples\Qt-6.0.0\corelib\tools\customtype> cmake --build .
FAILED: CMakeFiles/customtype.dir/main.cpp.obj
C:\PROGRA~1\LLVM\bin\CLANG_~1.EXE -DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -I. -Icustomtype_autogen/include -isystem C:/Qt/6.0.0/msvc2019_64/include/QtCore -isystem C:/Qt/6.0.0/msvc2019_64/include -isystem C:/Qt/6.0.0/msvc2019_64/mkspecs/win32-msvc -isystem C:/Qt/6.0.0/msvc2019_64/include/QtGui -isystem C:/VulkanSDK/1.2.148.1/Include -isystem C:/Qt/6.0.0/msvc2019_64/include/QtWidgets -g -Xclang -gcodeview -O0 -D_DEBUG -D_DLL -D_MT -Xclang --dependent-lib=msvcrtd -Zc:__cplusplus -permissive- -utf-8 -std=gnu++17 -MD -MT CMakeFiles/customtype.dir/main.cpp.obj -MF CMakeFiles\customtype.dir\main.cpp.obj.d -o CMakeFiles/customtype.dir/main.cpp.obj -c main.cpp
CLANG_~1: error: unknown argument: '-permissive-'
CLANG_~1: error: unsupported use of internal gcc -Z option '-Zc:__cplusplus'