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Modules were added to C with 10 lines of code:

The same technique could be used with C++.

The method is based on the idea that the product of the semantic pass of a compiler is a symbol table. Then, to make imports work:

1. add some syntax to import a module

2. create another instance of the compiler to compile that module and return the symbol table

3. have the importer, when it doesn't find a symbol in the symbol table, to search the symbol tables of the imports

There is an active MR [1] to add modules support to CMake 3.24 (based on this comment [2])

Thanks for posting this information. Module support is the one feature I am really looking forward to.