mirror of
https://github.com/rust-lang/rust
synced 2024-09-05 16:57:03 +00:00
07dc3ebf5c
Unlike static declarations with #[linkage], for definitions rustc doesn't rewrite it to add an extra indirection.
25 lines
621 B
Rust
25 lines
621 B
Rust
//! The symbols are resolved by the linker. It doesn't make sense to change
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//! them at runtime, so deny mutable statics with #[linkage].
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#![feature(linkage)]
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fn main() {
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#[rustfmt::skip]
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extern "C" {
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#[linkage = "extern_weak"] //~ ERROR extern mutable statics are not allowed with `#[linkage]`
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static mut EXTERN_WEAK: *const u8;
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}
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unsafe {
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assert_eq!(EXTERN_WEAK as usize, 0);
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}
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// static mut is fine here as this is a definition rather than declaration.
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#[linkage = "weak"]
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static mut WEAK_DEF: u8 = 42;
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unsafe {
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assert_eq!(WEAK_DEF, 0);
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}
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}
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