It’s a lacking point yes but unless you want to use a closed-source library it’s also a non-issue, which is why it has never been given priority. It’s not like language semantics would prevent portable dylibs it’s that there’s more important fronts to improve Rust on. A proper solution would take quite some engineering effort, and do note that C doesn’t have a proper solution either it just lets you link stuff up willy-nilly and then crash. Rust is actually in a better position to implement a proper solution than C is.
The “big project” thing is a red herring given that rust compiles incrementally. I know it is technically possible to not rebuild everything from scratch in C but the code has to specifically written to not break assumptions your build system makes while rust is happily re-using the compilation results for one function in a file while discarding those of another because actual dependencies are actually tracked. Out of the box.
Speaking of large Rust projects and proper type-safe linking: The WebAssembly folks are hashing out their Component Model which isn’t really limited to compiling to wasm, in principle: Big picture it’s a way to programmatically specify ABIs and even derive ABI translation code. That might be a good option as a rust-specific solution would be, well, rust-specific and when you engineer something that can support multiple versions of a language you can just as well engineer a bit more and have something cross-language.
It’s a lacking point yes but unless you want to use a closed-source library it’s also a non-issue, which is why it has never been given priority. It’s not like language semantics would prevent portable dylibs it’s that there’s more important fronts to improve Rust on. A proper solution would take quite some engineering effort, and do note that C doesn’t have a proper solution either it just lets you link stuff up willy-nilly and then crash. Rust is actually in a better position to implement a proper solution than C is.
The “big project” thing is a red herring given that rust compiles incrementally. I know it is technically possible to not rebuild everything from scratch in C but the code has to specifically written to not break assumptions your build system makes while rust is happily re-using the compilation results for one function in a file while discarding those of another because actual dependencies are actually tracked. Out of the box.
Speaking of large Rust projects and proper type-safe linking: The WebAssembly folks are hashing out their Component Model which isn’t really limited to compiling to wasm, in principle: Big picture it’s a way to programmatically specify ABIs and even derive ABI translation code. That might be a good option as a rust-specific solution would be, well, rust-specific and when you engineer something that can support multiple versions of a language you can just as well engineer a bit more and have something cross-language.