What does adding a module definition file via target_sources do?

[buildSystemPerson]

What you might be thinking about is how does a *.def file listed in the sources for a target end up being handled.

Yes that is what I was trying to ask. I tried reading the CMake code but it was unclear to me.

I don’t know if the special handling for MSVC in your example is necessary.

I’m not sure based on my past experience it seems there are minor differences between Ninja / Visual
Studio builds on MSVC:

Does adding `.natvis` files via target_sources work on Ninja?

According to the docs as of CMake 3.7 Visual Studio Generators for VS 2010 and above learned to place .natvis source files into VS project files properly. Which means the following will work correctly with Visual Studio generators. target_sources(foobar PRIVATE foobar.natvis) Will this also work for Ninja on MSVC? Do I need to guard this with a check for MSVC?