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Fallback to fat LTO for -Clto=thin in cg_gcc #153503

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Merged
rust-bors merged 1 commit into from
Mar 7, 2026
+3 −3
Merged

Fallback to fat LTO for -Clto=thin in cg_gcc #153503

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2 changes: 1 addition & 1 deletion compiler/rustc_session/src/errors.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -539,5 +539,5 @@ pub(crate) struct UnexpectedBuiltinCfg {
}

#[derive(Diagnostic)]
#[diag("ThinLTO is not supported by the codegen backend")]
#[diag("ThinLTO is not supported by the codegen backend, using fat LTO instead")]
pub(crate) struct ThinLtoNotSupportedByBackend;
4 changes: 2 additions & 2 deletions compiler/rustc_session/src/session.rs
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Expand Up @@ -620,9 +620,9 @@ impl Session {
config::LtoCli::Thin => {
// The user explicitly asked for ThinLTO
if !self.thin_lto_supported {
// Backend doesn't support ThinLTO, disable LTO.
// Backend doesn't support ThinLTO, fallback to fat LTO.
self.dcx().emit_warn(errors::ThinLtoNotSupportedByBackend);
return config::Lto::No;
return config::Lto::Fat;
}
return config::Lto::Thin;
}
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