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Only export __tls_* on wasm32-unknown-unknown. #102440

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Oct 5, 2022
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Only export __tls_* on wasm32-unknown-unknown. #102440

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15 changes: 9 additions & 6 deletions compiler/rustc_codegen_ssa/src/back/linker.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1180,16 +1180,19 @@ impl<'a> WasmLd<'a> {
// sharing memory and instantiating the module multiple times. As a
// result if it were exported then we'd just have no sharing.
//
// * `--export=*tls*` - when `#[thread_local]` symbols are used these
// symbols are how the TLS segments are initialized and configured.
// On wasm32-unknown-unknown, we also export symbols for glue code to use:
// * `--export=*tls*` - when `#[thread_local]` symbols are used these
// symbols are how the TLS segments are initialized and configured.
if sess.target_features.contains(&sym::atomics) {
cmd.arg("--shared-memory");
cmd.arg("--max-memory=1073741824");
cmd.arg("--import-memory");
cmd.arg("--export=__wasm_init_tls");
cmd.arg("--export=__tls_size");
cmd.arg("--export=__tls_align");
cmd.arg("--export=__tls_base");
if sess.target.os == "unknown" {
cmd.arg("--export=__wasm_init_tls");
cmd.arg("--export=__tls_size");
cmd.arg("--export=__tls_align");
cmd.arg("--export=__tls_base");
}
}
WasmLd { cmd, sess }
}
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