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

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Hayden602 wants to merge 1 commit into rust-lang:master

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

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When compiling with the flag RUSTFLAGS="-Zautodiff=Enable", lto = "fa...

Hayden602 Sep 3, 2025

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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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Original file line number	Diff line number	Diff line change
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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