Rust version of __attribute(used)__ (GCC) or llvm.used (LLVM).

[dpc]

There come times when rust symbols are referenced only by external assembler. It seems rustc is eager to remove them (especially with -C lto, even making them public does not help).

In clang and gcc there are ways to prevent it, correspondingly: __attribute__((used)) and llvm.used`

If there's a way to get the same behavior in Rust? If not, can be added?

[steveklabnik]

We do not currently.

If not, can be added?

It might be able to, but significant additions to Rust go through our RFC process, which is in another repository: https://github.com/rust-lang/rfcs/

If you'd like to pursue adding this feature to Rust, please open an issue up over there. Thanks!