How to avoid bindgen being out of sync with cc?

[Sympatron]

My understanding is, that it is very common to wrap a C library in a Rust *-sys crate by using bindgen to automatically generate Rust bindings and cc to compile the C code.

As far as I understand it bindgen uses libclang to parse the C headers and cc uses whatever compiler the user provides.

This can lead to problems, because both toolchains don't need to agree on everything. While cross compiling for thumbv6m-none-eabi on Windows, bindgen generated u32 for enums and cc used u8 when possible (-fshort-enums).

This is quite unfortunate and hard to catch. Is there a common workaround for this?

PS: If there is a better place for this issue please tell me.

[pvdrz]

the easiest I can think of is to set the relevant environment variables for clang-sys and use the same paths when calling Build::compiler

The docs for Build::compiler also say that the compiler is automatically detected from a number of environment variables so it might be that setting CC or similar to be consistent with the clang-sys environment variables might work as well.