Working with CMake project that uses cargo

[mschuckmann]

I'm working on creating a recipe that builds a C interop library for a rust based project zenoh-c.

The recommended method for building and installing the library is to use CMake which uses cargo to build the .so file and then uses standard CMake idioms to install the library, headers, pkgconfig, and CMake configuration files.

It seems that I can use cargo_bin to build the .so file without much problem but I'm at a bit of a loss on how to make the CMake specific stuff work. I also tried using snippets of code from cargo_bin.bbclass in my recipe to configure the environment to allow CMake to drive the cargo build for the target but it's not quite working like I'd expect.

I'm wondering if anyone can make any recommendations the best way to go here.

I'm also wondering if maybe the code in cargo_bin.bbclass that configures the environment, scripts, etc can be broken out into a separate class that recipes that don't want to call cargo build directly can use. The cargo_bin.bbclass would obviously use this new class.

[tronical]

In Slint we build a cdylib with cargo (via Corrosion) and package it up with CMake. It’s quite okay to combine both classes, we do that at https://github.com/slint-ui/meta-slint/blob/meta-rust-bin/recipes-slint/slint/slint-cpp-v2.inc

[mschuckmann]

That looks promising, thank you for the example @tronical