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Suggest #[unsafe(no_mangle)] for entry points in no_std binaries #163559

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Merged
rust-bors merged 1 commit into from
Oct 1, 2026
+2 −2
Merged

Suggest #[unsafe(no_mangle)] for entry points in no_std binaries #163559

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2 changes: 1 addition & 1 deletion compiler/rustc_monomorphize/src/diagnostics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,7 @@ pub(crate) struct EncounteredErrorWhileInstantiatingGlobalAsm {
#[derive(Diagnostic)]
#[diag("using `fn main` requires the standard library")]
#[help(
"use `#![no_main]` to bypass the Rust generated entrypoint and declare a platform specific entrypoint yourself, usually with `#[no_mangle]`"
"use `#![no_main]` to bypass the Rust generated entrypoint and declare a platform specific entrypoint yourself, usually with `#[unsafe(no_mangle)]`"
)]
pub(crate) struct StartNotFound;

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2 changes: 1 addition & 1 deletion tests/ui/no_std/no-std-no-start-binary.stderr
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@@ -1,6 +1,6 @@
error: using `fn main` requires the standard library
|
= help: use `#![no_main]` to bypass the Rust generated entrypoint and declare a platform specific entrypoint yourself, usually with `#[no_mangle]`
= help: use `#![no_main]` to bypass the Rust generated entrypoint and declare a platform specific entrypoint yourself, usually with `#[unsafe(no_mangle)]`

error: aborting due to 1 previous error

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