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Improve default target options for x86_64-unknown-linux-none #134765

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Dec 29, 2024
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Improve default target options for x86_64-unknown-linux-none #134765

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e5bf8b0
Make x86_64-unknown-linux-gno panic=abort and mark as no_std
Noratrieb Dec 25, 2024
b235cc9
Document x86_64-unknown-linux-none is PIE by default
Noratrieb Dec 25, 2024
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5 changes: 3 additions & 2 deletions compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_none.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
use crate::spec::{Cc, LinkerFlavor, Lld, StackProbeType, Target, base};
use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, StackProbeType, Target, base};

pub(crate) fn target() -> Target {
let mut base = base::linux::opts();
Expand All @@ -7,14 +7,15 @@ pub(crate) fn target() -> Target {
base.stack_probes = StackProbeType::Inline;
base.linker_flavor = LinkerFlavor::Gnu(Cc::No, Lld::Yes);
base.linker = Some("rust-lld".into());
base.panic_strategy = PanicStrategy::Abort;

Target {
llvm_target: "x86_64-unknown-linux-none".into(),
metadata: crate::spec::TargetMetadata {
description: None,
tier: None,
host_tools: None,
std: Some(true),
std: Some(false),
},
pointer_width: 64,
data_layout:
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5 changes: 5 additions & 0 deletions src/doc/rustc/src/platform-support/x86_64-unknown-linux-none.md
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Expand Up @@ -14,6 +14,11 @@ This target is cross compiled and can be built from any host.

This target has no support for host tools, std, or alloc.

One of the primary motivations of the target is to write a dynamic linker and libc in Rust.
For that, the target defaults to position-independent code and position-independent executables (PIE) by default.
PIE binaries need relocation at runtime. This is usually done by the dynamic linker or libc.
You can use `-Crelocation-model=static` to create a position-dependent binary that does not need relocation at runtime.

## Building the target

The target can be built by enabling it for a `rustc` build:
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