Description
Is your feature request related to a problem? Please describe.
Since CMake 3.28, it supports c++ modules (see https://www.kitware.com/import-cmake-the-experiment-is-over/). We can set file set CXX_MODULES for a library so library or executable depend on it can use its module interface unit. However, prefab does not support c++ modules. The cmake package it generates does not set the CXX_MODULES file set.
Describe the solution you'd like
Generate CXX_MODULES file set for the cmake package generated for a prefab package.
Describe alternatives you've considered
In AGP, we can set headers directory in prefab.package, maybe it's better to add modules to set the directory for module interface unit.
Or we can use hardcode some extensions (e.g., .ixx, .cxx, .cppm) to generate the CXX_MODULES file set instead of add a new directory.
Additional context
"""target_sources($name INTERFACE FILE_SET CXX_MODULES BASE_DIRS "$includes" FILES
"${files.joinToString(';')}")"""