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sylvestre merged 2 commits into from
Oct 17, 2026
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docs: document id rustix LD_PRELOAD compatibility #15261

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docs: document id rustix LD_PRELOAD compatibility
mvanhorn Oct 12, 2026
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docs: keep the rustix libc backend note only in packaging.md
mvanhorn Oct 15, 2026
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11 changes: 10 additions & 1 deletion docs/src/packaging.md
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@@ -1,6 +1,6 @@
# Packaging coreutils

<!-- spell-checker:ignore debuginfo manpages backtraces profdata profraw sysroot rustlib msvc Cprofile DESTDIR -->
<!-- spell-checker:ignore debuginfo manpages backtraces profdata profraw sysroot rustlib msvc Cprofile DESTDIR fakeroot -->

> **Note**: This page is intended as a guide for packaging the uutils coreutils
> for package maintainers. Normal users probably do not need to read this. If you
Expand Down Expand Up @@ -72,6 +72,15 @@ It is also possible to split the debuginfo into a separate package. See the
[`split-debuginfo`](https://doc.rust-lang.org/cargo/reference/profiles.html#split-debuginfo)
option in `cargo`.

On Linux, rustix's raw syscall backend bypasses libc function interposition.
An `LD_PRELOAD` interceptor such as `fakeroot` cannot override affected calls

@sylvestre sylvestre Oct 12, 2026

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only id? if other utils are affected, please list them, otherwise say just id

@oech3 oech3 Oct 12, 2026

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It is probably difficult to list all utils. Add "for example" to somewhere.

in some utilities. For example, under `fakeroot`, `id -u` still reports the
real UID. To ship the multicall binary with rustix's libc wrappers, build with:

```bash
cargo build --release --features unix,rustix/use-libc
```

## Profile-Guided Optimization (PGO)

The release binaries we publish are built with [Profile-Guided
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