Troubles with C++20 modules and CMake

["Hlusicka, Jakub \(Ceske vysoke uceni technicke v Praze -...\) via Gcc-help" <gcc-help@xxxxxxxxxxx>]

Hello, I am trying to use C++20 modules with CMake and GCC, but I cannot seem to be able to get it to work. I am getting the following error message when running CMake to generate build files:

CMake Error in core/CMakeLists.txt:
  The target named "core" has C++ sources that may use modules, but the
  compiler does not provide a way to discover the import graph dependencies.
  See the cmake-cxxmodules(7) manual for details.  Use the
  CMAKE_CXX_SCAN_FOR_MODULES variable to enable or disable scanning.

The versions of the software I am using:
GCC version: 13.2.1
CMake version: 3.28.3

Is this feature currently not supported, or am I doing something wrong?

Thank you,
Jakub Hlusička


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