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Implement set_output_kind for Emscripten linker #98358

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Implement set_output_kind for Emscripten linker #98358

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bb977cf
Implement set_output_kind for emscripten linker
hoodmane Jun 21, 2022
1304f17
Set crt_static_respected to true for the Emscripten target
hoodmane Jul 14, 2022
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27 changes: 26 additions & 1 deletion compiler/rustc_codegen_ssa/src/back/linker.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1041,7 +1041,32 @@ impl<'a> Linker for EmLinker<'a> {
&mut self.cmd
}

fn set_output_kind(&mut self, _output_kind: LinkOutputKind, _out_filename: &Path) {}
fn set_output_kind(&mut self, output_kind: LinkOutputKind, _out_filename: &Path) {
match output_kind {
LinkOutputKind::DynamicNoPicExe | LinkOutputKind::DynamicPicExe => {
// "-sMAIN_MODULE=1" breaks
// https://github.com/rust-lang/rust/issues/92738
self.cmd.arg("-sMAIN_MODULE=2");
}
LinkOutputKind::DynamicDylib | LinkOutputKind::StaticDylib => {
// -sSIDE_MODULE=1 breaks
// https://github.com/rust-lang/rust/issues/92738
// In any case, -sSIDE_MODULE=2 is better because Rust is good at
// calculating exports.
self.cmd.arg("-sSIDE_MODULE=2");
// Without -sWASM_BIGINT there are issues with dynamic Rust libraries. There
// are no plans to fix this in Emscripten AFAIK. See
// https://github.com/emscripten-core/emscripten/pull/16693 This could also
// be fixed with panic=abort.
self.cmd.arg("-sWASM_BIGINT");
Comment on lines +1057 to +1061
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This problem is fixed now:
emscripten-core/emscripten#17328
so I should remove it.

}
// -fno-pie is the default on Emscripten.
LinkOutputKind::StaticNoPicExe | LinkOutputKind::StaticPicExe => {}
LinkOutputKind::WasiReactorExe => {
unreachable!();
}
}
}

fn include_path(&mut self, path: &Path) {
self.cmd.arg("-L").arg(path);
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2 changes: 2 additions & 0 deletions compiler/rustc_target/src/spec/wasm32_unknown_emscripten.rs
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Expand Up @@ -27,6 +27,8 @@ pub fn target() -> Target {
exe_suffix: ".js".into(),
linker: None,
relocation_model: RelocModel::Pic,
crt_static_respected: true,
crt_static_default: true,
panic_strategy: PanicStrategy::Unwind,
no_default_libraries: false,
post_link_args,
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