Strange compilation error of resource file with Qt 6.1.1 RC

DerReisende

I have written a c++20 msvc cmake project initially based on Qt 6.0 on windows.
Everything worked fine for the upgrade to Qt 6.1 and the project happily compiles (besides fixing a qproperty.h bug in 6.1).
Today I downloaded the 6.1.1 Preview with maintenance tool to recompile the app. Had to locally fix qproperty.h bug here as well.

Now I do get this very strange error:

CMakeFiles\OrgElemTreeView.dir\orgelemtreeview.rc.res C:\Users\aea_t\Documents\development\Qt-Projekte\OrgElemTreeViewer\orgelemtreeview.rc
clang: error: no such file or directory: '/P'
clang: error: no such file or directory: '/DRC_INVOKED'
clang: error: no such file or directory: '/TC'
clang: error: no such file or directory: '/nologo'
clang: error: no such file or directory: '/showIncludes'
clang: error: no such file or directory: '/out:CMakeFiles\OrgElemTreeView.dir\orgelemtreeview.rc.res.dep.obj'
ninja: build stopped: subcommand failed.

This is really strange to me as it worked with previous Qt6 versions and the resource file integration in cmake is based on this document:

IF(WIN32)
  set(app_icon_resource_windows "${CMAKE_SOURCE_DIR}/orgelemtreeview.rc")
ENDIF(WIN32)

qt_add_executable(${CMAKE_PROJECT_NAME}
    ${SOURCES}
    ${app_icon_resource_windows}
    )

clang ist not installed with my MSVC installation and as I said it worked before.

Maybe someone has a hint for me?

Thx,

Christian

DerReisende

Okay I finally got it to build. It seems to be caused by Qt Creator setting the C compiler in the options to clang:
2021-06-03 (1).png

After overriding CMAKE_C_COMPILER manually in the Projects tab I do get a successful build.

Still I don't know why I cannot change the compiler in the 6.1.1 kit, which is possible for the 6.1.0 kit.