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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
no arguments or argc+argv doesn't work, because wasm requires caller and
callee signatures to match. WASI's current strategy is to have compilers
mangle main's name to indicate which signature they're using. Rust uses the
no-argument form, which should be mangled as `__main_void`.

This is needed on wasm32-wasi as of #105395.
This commit is contained in:
Dan Gohman 2022-12-08 10:35:46 -08:00
parent 7632db0e87
commit 98ae83daae
1 changed files with 4 additions and 0 deletions
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4
compiler/rustc_target/src/spec/wasm32_wasi.rs
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@ -104,6 +104,10 @@ pub fn target() -> Target {
// `args::args()` makes the WASI API calls itself. // `args::args()` makes the WASI API calls itself.
options.main_needs_argc_argv = false; options.main_needs_argc_argv = false;
// And, WASI mangles the name of "main" to distinguish between different
// signatures.
options.entry_name = "__main_void".into();
Target { Target {
llvm_target: "wasm32-wasi".into(), llvm_target: "wasm32-wasi".into(),
pointer_width: 32, pointer_width: 32,