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Rollup merge of #105405 - sunfishcode:sunfishcode/export-dynamic, r=T…
…aKO8Ki Stop passing -export-dynamic to wasm-ld. -export-dynamic was a temporary hack added in the early days of the Rust wasm32 target when Rust didn't have a way to specify wasm exports in the source code. This flag causes all global symbols, and some compiler-internal symbols, to be exported, which is often more than needed. Rust now does have a way to specify exports in the source code: `#[export_name = "..."]`. So as the original comment suggests, -export-dynamic can now be removed, allowing users to have smaller binaries and better encapsulation in their wasm32-unknown-unknown modules. It's possible that this change will require existing wasm32-unknown-unknown users will to add explicit `#[export_name = "..."]` directives to exporrt the symbols that their programs depend on having exported.
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