Hi,
In bug 1478813 (now on inbound), I've added a new toolchain job and code
to install cbindgen[1] via `mach bootstrap`, and it will become a hard
build dependency in the near future.
We use it on the style system to generate C++ structs / enums from the
Rust definitions (as opposed to bindgen[2], which we use for the
opposite thing).
The reasons we want to do something like that are various, but basically
it will allow us to slowly get rid of a lot of unsafe (and not optimal)
Rust -> C++ conversion code[3], and maybe even autogenerate the style
structs to optimally pack them and save some memory without any
manually-written scary code.
Please remember to run mach bootstrap if you run into build issues
related to this in the coming days.
Thanks!
-- Emilio
[1]: https://github.com/eqrion/cbindgen
[2]: https://github.com/servo/rust-bindgen
[3]:
https://searchfox.org/mozilla-central/source/servo/components/style/properties/gecko.mako.rs
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