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Recommend -Zshare-generics=false with opt-level=z #81

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Recommend -Zshare-generics=false with opt-level=z #81

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18 changes: 17 additions & 1 deletion README.md
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Expand Up @@ -122,6 +122,22 @@ Enable this in `Cargo.toml`:
panic = "abort"
```

# (Un)Share Generics

![Minimum Rust: Nightly](https://img.shields.io/badge/Minimum%20Rust%20Version-nightly-orange.svg)

Currently Rust enables `-Zshare-generics` implicitly for opt-level `"s"` and `"z"`.
Just like `"s"` vs `"z"`, this can sometimes be helpful and sometimes cause larger binaries.

To avoid sharing generics, use the unstable
`rustc` `-Zshare-generics` flag:
flag:

```bash
$ RUSTFLAGS="-Zshare-generics=false" cargo +nightly build --release
```


# Remove Location Details

![Minimum Rust: Nightly](https://img.shields.io/badge/Minimum%20Rust%20Version-nightly-orange.svg)
Expand Down Expand Up @@ -438,4 +454,4 @@ use std::alloc::System;

#[global_allocator]
static A: System = System;
```
```
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@Noratrieb Noratrieb Jun 7, 2025 •
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Looks like there was no trailing newline and my editor added it automatically, which seems fine to me