Emit the emscripten entry point as `__main_argc_argv` by guybedford · Pull Request #158937 · rust-lang/rust

guybedford · 2026-07-08T01:33:05Z

Fixes support for building wasm32-unknown-emscripten under the -sPROXY_TO_PTHREAD linking option.

The wasm32-unknown-emscripten target uses the argc/argv form of main but emitted the entry point under the raw name main. That links on the default entry path (emscripten calls it via callMain), but fails on entry paths that reference the mangled symbol directly from wasm. In particular -sPROXY_TO_PTHREAD links crt1_proxy_main.o, whose call chain bottoms out at __main_argc_argv, so linking a Rust binary fails with:

    wasm-ld: error: crt1_proxy_main.o: undefined symbol: main

This sets entry_name = "__main_argc_argv" so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases.

The JS-visible name of the entry point stays _main, since emscripten bridges _main to the wasm __main_argc_argv export internally (whereas it wouldn't for ___main_argc_argv).

The `wasm32-unknown-emscripten` target uses the argc/argv form of main but emitted the entry point under the raw name `main`. That links on the default entry path (emscripten calls it via `callMain`), but fails on entry paths that reference the mangled symbol directly from wasm. In particular `-sPROXY_TO_PTHREAD` links `crt1_proxy_main.o`, whose call chain bottoms out at `__main_argc_argv`, so linking a Rust binary fails with: ``` wasm-ld: error: crt1_proxy_main.o: undefined symbol: main ``` This sets `entry_name = "__main_argc_argv"` so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases. The JS-visible name of the entry point stays `_main`, since emscripten bridges `_main` to the wasm `__main_argc_argv` export internally (whereas it wouldn't for `___main_argc_argv`).

rustbot · 2026-07-08T01:33:09Z

These commits modify compiler targets.
(See the Target Tier Policy.)

rustbot · 2026-07-08T01:33:11Z

r? @jieyouxu

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jieyouxu · 2026-07-08T11:45:26Z

Maybe r? @bjorn3 (since you are already looking at it and actually know stuff about wasm)

bjorn3

Makes sense. Code changes LGTM. And I will trust your judgement as someone with write permissions to Emscripten that this is a change that should be done.

r=me with or without the comment changed.

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bjorn3 · 2026-07-08T17:40:29Z

@bors r+

rust-bors · 2026-07-08T17:40:32Z

📌 Commit 15f9829 has been approved by bjorn3

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 10. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

…, r=bjorn3 Emit the emscripten entry point as `__main_argc_argv` Fixes support for building `wasm32-unknown-emscripten` under the `-sPROXY_TO_PTHREAD` linking option. The `wasm32-unknown-emscripten` target uses the argc/argv form of main but emitted the entry point under the raw name `main`. That links on the default entry path (emscripten calls it via `callMain`), but fails on entry paths that reference the mangled symbol directly from wasm. In particular `-sPROXY_TO_PTHREAD` links `crt1_proxy_main.o`, whose call chain bottoms out at `__main_argc_argv`, so linking a Rust binary fails with: ``` wasm-ld: error: crt1_proxy_main.o: undefined symbol: main ``` This sets `entry_name = "__main_argc_argv"` so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases. The JS-visible name of the entry point stays `_main`, since emscripten bridges `_main` to the wasm `__main_argc_argv` export internally (whereas it wouldn't for `___main_argc_argv`).

…uwer Rollup of 25 pull requests Successful merges: - #158871 (add relnotes for 1.97.0) - #158968 (stdarch subtree update) - #154445 (rustdoc: Represent `--output-format=json` coverage and ir differently) - #156370 (Reject linked dylib EII default overrides) - #157153 (allow `Allocator`s to be used as `#[global_allocator]`s) - #158495 (Rename HAS_CT_PROJECTION to HAS_CONST_ALIAS) - #158617 (allow mGCA const arguments to fall back to anon consts) - #158645 (Fix splat ICEs and ban it in closures) - #158655 (Fix coroutine MIR saved local remapping) - #158666 (Carry the `b_offset` inside `BackendRepr::ScalarPair`) - #158912 (Introduce new bootstrap config section for PGO configuration) - #158920 (Update wasm-component-ld to 0.5.26) - #158926 (wrapping_sh* methods: clarify underspecified reference) - #158927 (add core test run with `-Zforce-intrinsic-fallback`) - #158932 (Do not build the compiler when invoking `x perf compare`) - #158937 (Emit the emscripten entry point as `__main_argc_argv`) - #151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - #156548 ( Library support for aarch64-unknown-linux-pauthtest target) - #158307 (CI job for parallel frontend ui tests) - #158347 (Improve generic parameters handling for #[diagnostic::on_const]) - #158722 (delegation: do not always inherit `ConstArgHasType` predicates) - #158741 (Simplify `Option::into_flat_iter` signature) - #158807 (Add regression test for CString::clone_into unwind safety) - #158862 (Fix the span for parameter suggestion ) - #158883 (tests: fix enum-match.rs to handle LLVM 23)

…, r=bjorn3 Emit the emscripten entry point as `__main_argc_argv` Fixes support for building `wasm32-unknown-emscripten` under the `-sPROXY_TO_PTHREAD` linking option. The `wasm32-unknown-emscripten` target uses the argc/argv form of main but emitted the entry point under the raw name `main`. That links on the default entry path (emscripten calls it via `callMain`), but fails on entry paths that reference the mangled symbol directly from wasm. In particular `-sPROXY_TO_PTHREAD` links `crt1_proxy_main.o`, whose call chain bottoms out at `__main_argc_argv`, so linking a Rust binary fails with: ``` wasm-ld: error: crt1_proxy_main.o: undefined symbol: main ``` This sets `entry_name = "__main_argc_argv"` so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases. The JS-visible name of the entry point stays `_main`, since emscripten bridges `_main` to the wasm `__main_argc_argv` export internally (whereas it wouldn't for `___main_argc_argv`).

Rollup of 25 pull requests Successful merges: - #158871 (add relnotes for 1.97.0) - #158968 (stdarch subtree update) - #157690 (codegen_ssa: pack small const aggregates into immediate stores) - #158541 (Move `std::io::Write` to `core::io`) - #154445 (rustdoc: Represent `--output-format=json` coverage and ir differently) - #156370 (Reject linked dylib EII default overrides) - #157153 (allow `Allocator`s to be used as `#[global_allocator]`s) - #158495 (Rename HAS_CT_PROJECTION to HAS_CONST_ALIAS) - #158617 (allow mGCA const arguments to fall back to anon consts) - #158645 (Fix splat ICEs and ban it in closures) - #158655 (Fix coroutine MIR saved local remapping) - #158666 (Carry the `b_offset` inside `BackendRepr::ScalarPair`) - #158870 (std: merge the unix-like io::error modules into one file) - #158920 (Update wasm-component-ld to 0.5.26) - #158926 (wrapping_sh* methods: clarify underspecified reference) - #158927 (add core test run with `-Zforce-intrinsic-fallback`) - #158932 (Do not build the compiler when invoking `x perf compare`) - #158937 (Emit the emscripten entry point as `__main_argc_argv`) - #151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - #156144 (Better docs for PartialEq (includes macro rename)) - #156548 ( Library support for aarch64-unknown-linux-pauthtest target) - #158307 (CI job for parallel frontend ui tests) - #158347 (Improve generic parameters handling for #[diagnostic::on_const]) - #158722 (delegation: do not always inherit `ConstArgHasType` predicates) - #158741 (Simplify `Option::into_flat_iter` signature)

…, r=bjorn3 Emit the emscripten entry point as `__main_argc_argv` Fixes support for building `wasm32-unknown-emscripten` under the `-sPROXY_TO_PTHREAD` linking option. The `wasm32-unknown-emscripten` target uses the argc/argv form of main but emitted the entry point under the raw name `main`. That links on the default entry path (emscripten calls it via `callMain`), but fails on entry paths that reference the mangled symbol directly from wasm. In particular `-sPROXY_TO_PTHREAD` links `crt1_proxy_main.o`, whose call chain bottoms out at `__main_argc_argv`, so linking a Rust binary fails with: ``` wasm-ld: error: crt1_proxy_main.o: undefined symbol: main ``` This sets `entry_name = "__main_argc_argv"` so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases. The JS-visible name of the entry point stays `_main`, since emscripten bridges `_main` to the wasm `__main_argc_argv` export internally (whereas it wouldn't for `___main_argc_argv`).

Rollup of 23 pull requests Successful merges: - #158968 (stdarch subtree update) - #154445 (rustdoc: Represent `--output-format=json` coverage and ir differently) - #158495 (Rename HAS_CT_PROJECTION to HAS_CONST_ALIAS) - #158666 (Carry the `b_offset` inside `BackendRepr::ScalarPair`) - #158870 (std: merge the unix-like io::error modules into one file) - #158920 (Update wasm-component-ld to 0.5.26) - #158926 (wrapping_sh* methods: clarify underspecified reference) - #158927 (add core test run with `-Zforce-intrinsic-fallback`) - #158932 (Do not build the compiler when invoking `x perf compare`) - #158937 (Emit the emscripten entry point as `__main_argc_argv`) - #151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - #156144 (Better docs for PartialEq (includes macro rename)) - #156548 ( Library support for aarch64-unknown-linux-pauthtest target) - #157995 (`Vec::dedup_by` docs explicit function argument order) - #158307 (CI job for parallel frontend ui tests) - #158741 (Simplify `Option::into_flat_iter` signature) - #158807 (Add regression test for CString::clone_into unwind safety) - #158862 (Fix the span for parameter suggestion ) - #158894 (Make the ordering of non-terminal binds in ambiguity error messages deterministic) - #158902 (add codegen test for range length bound propagation) - #158913 (Update `browser-ui-test` version to `0.24.1`) - #158935 (std: support real fd methods on Emscripten) - #158978 (Add regression test for too-big by-value ABI args)

Rollup merge of #158937 - guybedford:emscripten-pthread-main, r=bjorn3 Emit the emscripten entry point as `__main_argc_argv` Fixes support for building `wasm32-unknown-emscripten` under the `-sPROXY_TO_PTHREAD` linking option. The `wasm32-unknown-emscripten` target uses the argc/argv form of main but emitted the entry point under the raw name `main`. That links on the default entry path (emscripten calls it via `callMain`), but fails on entry paths that reference the mangled symbol directly from wasm. In particular `-sPROXY_TO_PTHREAD` links `crt1_proxy_main.o`, whose call chain bottoms out at `__main_argc_argv`, so linking a Rust binary fails with: ``` wasm-ld: error: crt1_proxy_main.o: undefined symbol: main ``` This sets `entry_name = "__main_argc_argv"` so the entry point is emitted under the C-ABI name emscripten's crt/libc expects, and then works in both cases. The JS-visible name of the entry point stays `_main`, since emscripten bridges `_main` to the wasm `__main_argc_argv` export internally (whereas it wouldn't for `___main_argc_argv`).

Adds wasm32-unknown-emscripten as a target for nix, plus a temporary harness to run the full test suite under Node. Source changes to compile on emscripten (which behaves like a Linux/musl libc): * ioctl: use the Linux ioctl module and a c_int ioctl_num_type on emscripten (src/sys/ioctl, src/sys/mod.rs). * resource: enable getrlimit/setrlimit and the Resource enum via libc::rlimit. * socket: include emscripten in the SockaddrStorage AF_UNIX (pathname/unnamed) decode arms. * unistd: sethostname is unavailable on emscripten, so gate it out. Test harness (temporary, documented in .cargo/config.toml): * em-proxy.json is a wasm32-unknown-emscripten spec with entry-name overridden to __main_argc_argv, reproducing rust-lang/rust#158937 without a patched toolchain. * JSPI + pthread-proxy build (-sPROXY_TO_PTHREAD -sJSPI) with NODERAWFS/ NODERAWSOCKETS, -Zbuild-std, and a local libc patch (Cargo.toml) carrying the emscripten externs. * Requires nightly + rust-src, emcc on PATH, and a JSPI-capable Node (26+). Genuinely-unsupported operations are gated with #[cfg_attr(target_os = "emscripten", ignore = "...")] rather than cfg'd out, covering fork/wait, pty/termios, mkfifo, getpwnam/setgroups/acct, flock, if_nametoindex, pipe2, AF_UNIX SCM_RIGHTS/datagram, and thread signal swap. Suite result: 146 passed, 34 ignored, and 4 failing only as host artifacts (chown/fchown/fchownat need root; linkat_no_follow_symlink differs on macOS) - all green on Linux CI.

Rollup of 23 pull requests Successful merges: - rust-lang/rust#158968 (stdarch subtree update) - rust-lang/rust#154445 (rustdoc: Represent `--output-format=json` coverage and ir differently) - rust-lang/rust#158495 (Rename HAS_CT_PROJECTION to HAS_CONST_ALIAS) - rust-lang/rust#158666 (Carry the `b_offset` inside `BackendRepr::ScalarPair`) - rust-lang/rust#158870 (std: merge the unix-like io::error modules into one file) - rust-lang/rust#158920 (Update wasm-component-ld to 0.5.26) - rust-lang/rust#158926 (wrapping_sh* methods: clarify underspecified reference) - rust-lang/rust#158927 (add core test run with `-Zforce-intrinsic-fallback`) - rust-lang/rust#158932 (Do not build the compiler when invoking `x perf compare`) - rust-lang/rust#158937 (Emit the emscripten entry point as `__main_argc_argv`) - rust-lang/rust#151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - rust-lang/rust#156144 (Better docs for PartialEq (includes macro rename)) - rust-lang/rust#156548 ( Library support for aarch64-unknown-linux-pauthtest target) - rust-lang/rust#157995 (`Vec::dedup_by` docs explicit function argument order) - rust-lang/rust#158307 (CI job for parallel frontend ui tests) - rust-lang/rust#158741 (Simplify `Option::into_flat_iter` signature) - rust-lang/rust#158807 (Add regression test for CString::clone_into unwind safety) - rust-lang/rust#158862 (Fix the span for parameter suggestion ) - rust-lang/rust#158894 (Make the ordering of non-terminal binds in ambiguity error messages deterministic) - rust-lang/rust#158902 (add codegen test for range length bound propagation) - rust-lang/rust#158913 (Update `browser-ui-test` version to `0.24.1`) - rust-lang/rust#158935 (std: support real fd methods on Emscripten) - rust-lang/rust#158978 (Add regression test for too-big by-value ABI args)

Adds wasm32-unknown-emscripten as a target for nix, plus a CI job that runs the full test suite under Node. Source changes to compile on emscripten (which behaves like a Linux/musl libc): * ioctl: use the Linux ioctl module and a c_int ioctl_num_type on emscripten (src/sys/ioctl, src/sys/mod.rs). * resource: enable getrlimit/setrlimit and the Resource enum via libc::rlimit. * socket: include emscripten in the SockaddrStorage AF_UNIX (pathname/unnamed) decode arms. * unistd: sethostname is unavailable on emscripten, so gate it out. The suite spawns OS threads (signal and socket-peer tests), so std is rebuilt with atomics via -Zbuild-std and linked -pthread with -sPROXY_TO_PTHREAD so the main thread can block; JSPI (-sJSPI) provides the return-to-host suspension for blocking reads/writes, and NODERAWFS/NODERAWSOCKETS back the filesystem and sockets with node's. This needs nightly + rust-src and a JSPI-capable Node (26+, or 22 with --experimental-wasm-jspi). No custom target spec is required: nightly now emits the __main_argc_argv entry point (rust-lang/rust#158937). Genuinely-unsupported operations are ignored with #[cfg_attr(target_os = "emscripten", ignore)] rather than cfg'd out, covering fork/wait, pty/termios, mkfifo, getpwnam/setgroups/acct, flock, if_nametoindex, pipe2 FD_CLOEXEC, AF_UNIX SCM_RIGHTS/datagram, thread signal masking, and setrlimit; a few tests are cfg'd out where the feature is entirely absent (raw signal actions, socketpair) or the host differs (linkat symlink follow). Temporary, until the dependencies land upstream: * Cargo.toml patches libc to guybedford/libc#libc-0.2-emscripten for the emscripten externs (rust-lang/libc#5270). * the CI job builds against the guybedford/emscripten `cf` fork, which carries the NODEFS/socket/blocking patches this target depends on (emscripten-core/emscripten#27305, #27306). Suite result: 148 passed, 0 failed, 35 ignored under Node - green on Linux CI.

Adds wasm32-unknown-emscripten as a target for nix, plus a CI job that runs the full test suite under Node. Source changes to compile on emscripten (which behaves like a Linux/musl libc): * ioctl: use the Linux ioctl module and a c_int ioctl_num_type on emscripten (src/sys/ioctl, src/sys/mod.rs). * resource: enable getrlimit/setrlimit and the Resource enum via libc::rlimit. * socket: include emscripten in the SockaddrStorage AF_UNIX (pathname/unnamed) decode arms. * unistd: sethostname is unavailable on emscripten, so gate it out. The suite spawns OS threads (signal and socket-peer tests), so std is rebuilt with atomics via -Zbuild-std and linked -pthread with -sPROXY_TO_PTHREAD so the main thread can block; JSPI (-sJSPI) provides the return-to-host suspension for blocking reads/writes, and NODERAWFS/NODERAWSOCKETS back the filesystem and sockets with node's. This needs nightly + rust-src and a JSPI-capable Node (26+, or 22 with --experimental-wasm-jspi). No custom target spec is required: nightly now emits the __main_argc_argv entry point (rust-lang/rust#158937). Genuinely-unsupported operations are ignored with fork/wait, pty/termios, mkfifo, getpwnam/setgroups/acct, flock, if_nametoindex, pipe2 FD_CLOEXEC, AF_UNIX SCM_RIGHTS/datagram, thread signal masking, and setrlimit; a few tests are cfg'd out where the feature is entirely absent (raw signal actions, socketpair) or the host differs (linkat symlink follow). Temporary, until the dependencies land upstream: * Cargo.toml patches libc to guybedford/libc#libc-0.2-emscripten for the emscripten externs (rust-lang/libc#5270). * the CI job builds against the guybedford/emscripten `cf` fork, which carries the NODEFS/socket/blocking patches this target depends on (emscripten-core/emscripten#27305, #27306). Suite result: 148 passed, 0 failed, 35 ignored under Node - green on Linux CI.

Adds wasm32-unknown-emscripten as a target for nix, plus a CI job that runs the full test suite under Node. Source changes to compile on emscripten (which behaves like a Linux/musl libc): * ioctl: use the Linux ioctl module and a c_int ioctl_num_type on emscripten (src/sys/ioctl, src/sys/mod.rs). * resource: enable getrlimit/setrlimit and the Resource enum via libc::rlimit. * socket: include emscripten in the SockaddrStorage AF_UNIX (pathname/unnamed) decode arms. * unistd: sethostname is unavailable on emscripten, so gate it out. The suite spawns OS threads (signal and socket-peer tests), so std is rebuilt with atomics via -Zbuild-std and linked -pthread with -sPROXY_TO_PTHREAD so the main thread can block; JSPI (-sJSPI) provides the return-to-host suspension for blocking reads/writes, and NODERAWFS/NODERAWSOCKETS back the filesystem and sockets with node's. This needs nightly + rust-src and a JSPI-capable Node (26+, or 22 with --experimental-wasm-jspi). No custom target spec is required: nightly now emits the __main_argc_argv entry point (rust-lang/rust#158937). Unsupported operations are ignored with #[cfg_attr(target_os = "emscripten", ignore)] rather than cfg'd out wherever they still compile, covering fork/wait, pty/termios, mkfifo, getpwnam/setgroups/acct, flock, if_nametoindex, pipe2 FD_CLOEXEC, AF_UNIX SCM_RIGHTS/datagram, getsockname, socketpair, setrlimit, and the linkat symlink-follow host check. The signal-delivery tests (signal, killpg, thread mask) and the AF_ROUTE test are cfg'd out instead: compiling their extern "C" handlers in perturbs the wasm indirect function table and aborts the runtime. Temporary, until the dependencies land upstream: * the emscripten CI job injects a libc patch (guybedford/libc#libc-0.2-emscripten, rust-lang/libc#5270) via `cargo --config`, so other targets and CI jobs are unaffected. * it also builds against the guybedford/emscripten `cf` fork, which carries the NODEFS/socket/blocking patches this target depends on (emscripten-core/emscripten#27305, #27306). Suite result: 148 passed, 0 failed, 38 ignored under Node - green on Linux CI.

Adds `wasm32-unknown-emscripten` as a target for mio, plus a CI job that runs the suite under Node. Resolves tokio-rs#642. Emscripten exposes a real epoll backed by its runtime event loop, so the existing Linux epoll selector is reused rather than adding a new backend. The wasm `compile_error!` guard is relaxed to let emscripten through, and the `epoll`/`eventfd`/pipe-waker cfg lists gain emscripten. Because emscripten cannot block in `epoll_wait` without JSPI/ASYNCIFY, two non-blocking readiness paths are added alongside the normal `Poll::poll`: * `Poll::new_with_callback` arms a persistent callback on the epoll fd via the runtime's `emscripten_epoll_set_callback`, delivering ready events on a fresh host tick whenever the set makes progress. The callback state is boxed, owned by the arming selector, and disarmed on drop; it may freely re-enter mio to (de)register sources. * `Registry::poll_ready` does a zero-timeout drain of the same epoll set as a readiness probe where a blocking wait is impossible. AF_UNIX support is stream-only: emscripten's node-backed sockets have no datagram primitive, so `UnixDatagram` and the `socketpair`-based helpers are not compiled there. Sockets set `O_NONBLOCK` via `fcntl` since emscripten's `socket(2)` silently strips `SOCK_NONBLOCK`/`SOCK_CLOEXEC`. The suite spawns OS threads (socket-peer test harnesses), so std is rebuilt with atomics via -Zbuild-std and linked -pthread with -sPROXY_TO_PTHREAD so the main thread can block; JSPI (-sJSPI) provides the return-to-host suspension for blocking reads/writes, and NODERAWFS/NODERAWSOCKETS back the filesystem and sockets with node's. This needs nightly + rust-src and a JSPI-capable Node (26+, or 22 with --experimental-wasm-jspi). No custom target spec is required: nightly now emits the __main_argc_argv entry point (rust-lang/rust#158937). Doctests are skipped on this target: rustdoc does not apply the emcc link args, so the examples cannot be linked with the socket/thread runtime. Temporary, until the dependencies land upstream: * Cargo.toml patches libc to guybedford/libc#emscripten for the emscripten epoll/pthread externs (rust-lang/libc#5270). * the CI job builds against the guybedford/emscripten `cf` fork, which carries the epoll callback (emscripten-core/emscripten#27207), AF_UNIX pathname stream sockets, and multicast getsockopt patches this target depends on. Suite result: 148 passed, 0 failed, 3 ignored under Node - green on CI.

rustbot added A-run-make Area: port run-make Makefiles to rmake.rs S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 8, 2026

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Add wasm32-unknown-emscripten target support nix-rust/nix#2805

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Emit the emscripten entry point as `__main_argc_argv`#158937

Emit the emscripten entry point as `__main_argc_argv`#158937
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