Showcase insertion of CMake variables via `configure_file()`

[avitase]

Occasionally, I have to use CMake variables inside my C/C++ files. A canonical way to get access to these variables is to parse the file via configure_file(); however, I find it non-trivial to insert this into the existing template. What about showcasing this by, for example, returning CMAKE_PROJECT_NAME instead of hard coding the name here. Another common use case is to return the project version as a string.

[friendlyanon]

I don't think that's necessary. There are examples that use the function, such as this one.

I would prefer to keep things minimal as a baseline and put interesting things in the wiki as an example.

This might also be better as a discussion rather than an issue I think.

[avitase]

Does this example still work for multi-configs scenarios? For example this line looks outdated: https://github.com/friendlyanon/generate-opaque-structs/blob/218bd01cbdaf038d6ddf89bc4f9715ce4de7a782/CMakeLists.txt#L45

[friendlyanon]

There is nothing outdated there. I don't understand. configure_file's output happens at configure time, regardless of the config.