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Update documentation for fn target_config #140432

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Apr 29, 2025
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Update documentation for fn target_config #140432

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9 changes: 4 additions & 5 deletions compiler/rustc_codegen_ssa/src/traits/backend.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,15 +45,14 @@ pub trait CodegenBackend {

fn print(&self, _req: &PrintRequest, _out: &mut String, _sess: &Session) {}

/// Returns two feature sets:
/// - The first has the features that should be set in `cfg(target_features)`.
/// - The second is like the first, but also includes unstable features.
///
/// RUSTC_SPECIFIC_FEATURES should be skipped here, those are handled outside codegen.
/// Collect target-specific options that should be set in `cfg(...)`, including
/// `target_feature` and support for unstable float types.
fn target_config(&self, _sess: &Session) -> TargetConfig {
TargetConfig {
target_features: vec![],
unstable_target_features: vec![],
// `true` is used as a default so backends need to acknowledge when they do not
// support the float types, rather than accidentally quietly skipping all tests.
has_reliable_f16: true,
has_reliable_f16_math: true,
has_reliable_f128: true,
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