Comment by dwattttt
2 years ago
> If a non-polymorphic, non-inline function may have its address taken (as a function pointer), either because it is exported out of the crate or the crate takes a function pointer to it, generate a shim that uses -Zcallconv=legacy and immediately tail-calls the real implementation. This is necessary to preserve function pointer equality.
If the legacy shim tail calls the Rust-calling-convention function, won't that prevent it from fixing any return value differences in the calling convention?
Yes. People tend to forget about the return half of the calling convention though so it's an understandable typographical error.