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Automatically switch to lto-fat when flag RUSTFLAGS="- Zautodiff=Enable" is set #146229

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Automatically switch to lto-fat when flag RUSTFLAGS="- Zautodiff=Enable" is set #146229

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5 changes: 5 additions & 0 deletions compiler/rustc_session/src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1507,6 +1507,11 @@ impl Options {
pub fn get_symbol_mangling_version(&self) -> SymbolManglingVersion {
self.cg.symbol_mangling_version.unwrap_or(SymbolManglingVersion::Legacy)
}

#[inline]
pub fn autodiff_enabled(&self) -> bool {
self.unstable_opts.autodiff.contains(&AutoDiff::Enable)
}
}

impl UnstableOptions {
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5 changes: 5 additions & 0 deletions compiler/rustc_session/src/session.rs
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Expand Up @@ -658,6 +658,11 @@ impl Session {

/// Calculates the flavor of LTO to use for this compilation.
pub fn lto(&self) -> config::Lto {
// if autodiff is enabled, use fat lto
if self.opts.autodiff_enabled() {
return config::Lto::Fat;
}

// If our target has codegen requirements ignore the command line
if self.target.requires_lto {
return config::Lto::Fat;
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