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Rollup merge of #135446 - klensy:panic_immediate_abort_ext, r=Mark-Simulacrum

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further improve panic_immediate_abort by removing rtprintpanic! messages

Reduces binary size using `panic_immediate_abort` by removing strings used by `rtprintpanic!`.

for `main.rs`
```rust
fn main() {
    println!("Hello, world!");
}
```
with `Cargo.toml`
```toml
[package]
name = "tst"
version = "0.1.0"
edition = "2024"

[dependencies]

[profile.release]
lto = true
codegen-units = 1
panic = "abort"

```

and build with `RUSTFLAGS="-Zlocation-detail=none -Zfmt-debug=none" cargo +stage-1 b -r -Z build-std=std,panic_abort -Z build-std-features=optimize_for_size,panic_immediate_abort` for `x86_64-unknown-linux-gnu`

This reduces size:
| before |  after | type |
| - | - | - |
| 25256 | 21880 | unstripped |
| 18072 | 15288 | stripped |
This commit is contained in:
许杰友 Jieyou Xu (Joe) 2025-01-20 12:38:32 +08:00 • committed by GitHub
commit e5b85035fe
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5
library/std/src/rt.rs
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@ -32,9 +32,14 @@ use crate::{mem, panic, sys};
// - nothing (so this macro is a no-op)
macro_rules! rtprintpanic {
($($t:tt)*) => {
#[cfg(not(feature = "panic_immediate_abort"))]
if let Some(mut out) = crate::sys::stdio::panic_output() {
let _ = crate::io::Write::write_fmt(&mut out, format_args!($($t)*));
}
#[cfg(feature = "panic_immediate_abort")]
{
let _ = format_args!($($t)*);
}
}
}