Pre-RFC: unsafe attributes

RalfJ 提出一个 Pre-RFC ，提议为一些可能导致未定义行为的属性加上 unsafe，比如

rust
// SAFETY: there is no other global function of this name
#[unsafe(no_mangle)]
pub fn my_own_write(...) { ... }

之前有个issue 提出 #[no_mangle] 也是 Unsafe 的，在某些平台上（至少是 GNU/Linux，但也听说过 Windows 和其他几个平台），将两个静态库链接在一起，而这两个库都导出了一个同名的符号，那么哪个符号实际上被链接了，这是无法定义的。 相关issue https://github.com/rust-lang/rust/issues/28179

https://internals.rust-lang.org/t/pre-rfc-unsafe-attributes/17462

GitHub

#[no_mangle] is unsafe in the presence of name collisions · Issue #28179 · rust-lang/rust

On some platforms (at least GNU/Linux, but I hear Windows and several others too), if you link together two static libraries that both export a symbol of the same name, it's undefined which sym...