Allow to use symbols from another sys crate

[gdesmott]

I have 2 C libraries, let's call them A and B and I'm generating low levels bindings for both using bindgen. B is using A's symbols in its API. As a result the bindings generated in B-sys are using B namespaced types instead of A's.

It would be great to be able to ask bindgen to depends on A-sys and use those symbols, saving users to cast between B::some_type to A::some_type when using API from A-sys.

[emilio]

This can work already, you can blacklist_type("some_type") then raw_line("pub use B::some_type;"); or such. Does such a thing not work?

[gdesmott]

I'm already whitelisting B's symbols but A's are still generated anyway. Explicitly blacklisting them does not help either.

Here is B's build.rs and here is the generated bindings file.
As you can see, spa symbols (A), such as spa_hook, are still generated.

[emilio]

I'm already whitelisting B's symbols but A's are still generated anyway. Explicitly blacklisting them does not help either.

So something like blacklist_type("spa_.*") in B's build.rs still generates spa_hook and co? That would be unexpected.

[gdesmott]

My mistake it does work! I was assuming that white listing would be enough to not generate those and when I tried black list I forgot the . in the regexp.

Thanks a lot for your help @emilio !

[emilio]

Ah, great, glad it works :-)