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Fix TLS model on bootstrap for cygwin #141846

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Jun 1, 2025
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Fix TLS model on bootstrap for cygwin #141846

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7 changes: 6 additions & 1 deletion src/bootstrap/src/core/builder/cargo.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1004,7 +1004,12 @@ impl Builder<'_> {
// efficient initial-exec TLS model. This doesn't work with `dlopen`,
// so we can't use it by default in general, but we can use it for tools
// and our own internal libraries.
if !mode.must_support_dlopen() && !target.triple.starts_with("powerpc-") {
//
// Cygwin only supports emutls.
if !mode.must_support_dlopen()
&& !target.triple.starts_with("powerpc-")
&& !target.triple.contains("cygwin")
{
cargo.env("RUSTC_TLS_MODEL_INITIAL_EXEC", "1");
}

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