strict_linking_rs

Enforces the requirement that all functions defined inside your crate's extern "C" blocks must be resolved in the final executable.

To use

In your build.rs file add this line to your main() function

strict_linking::init();

And then in your Cargo.toml file add this

[build-dependencies]

strict_linking = "0.1"

How does it work?

First, we use cargo +nightly rustc --profile=check -- -Zunpretty-expanded to expand macros inside the code for your crate. Then we parse that with the syn crate, and walk down the syntax tree recursively, looking for extern "C" blocks. When we find them, we emit cargo:rustc-link-arg instructions in a platform specific manner to use flags like /INCLUDE and --undefined so that the linker will not link successfully if one of those symbols is missing.