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From 98ae83daae67e9e7663b8345eced1de8c667271f Mon Sep 17 00:00:00 2001
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From: Dan Gohman <dev@sunfishcode.online>
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Date: Thu, 8 Dec 2022 10:35:46 -0800
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Subject: [PATCH] Mangle "main" as "__main_void" on wasm32-wasi
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On wasm, the age-old C trick of having a main function which can either have
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no arguments or argc+argv doesn't work, because wasm requires caller and
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callee signatures to match. WASI's current strategy is to have compilers
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mangle main's name to indicate which signature they're using. Rust uses the
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no-argument form, which should be mangled as `__main_void`.
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This is needed on wasm32-wasi as of #105395.
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---
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compiler/rustc_target/src/spec/wasm32_wasi.rs | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/compiler/rustc_target/src/spec/wasm32_wasi.rs b/compiler/rustc_target/src/spec/wasm32_wasi.rs
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index 6f0bbf0672d4..a0476d542e64 100644
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--- a/compiler/rustc_target/src/spec/wasm32_wasi.rs
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+++ b/compiler/rustc_target/src/spec/wasm32_wasi.rs
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@@ -104,6 +104,10 @@ pub fn target() -> Target {
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// `args::args()` makes the WASI API calls itself.
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options.main_needs_argc_argv = false;
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+ // And, WASI mangles the name of "main" to distinguish between different
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+ // signatures.
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+ options.entry_name = "__main_void".into();
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+
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Target {
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llvm_target: "wasm32-wasi".into(),
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pointer_width: 32,
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--
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2.38.1
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