Can not build RustPython to wasm32-wasip2

miraclejzd

Summary

I am trying to build RustPython into .wasm file which can run Python program with ssl as dependency. I found that wasm32-wasip2 supports std fully, which means it supports socket proposal that wasm32-wasip1 does not.

But I failed.

Details

rustc version:

$ rustc --version
rustc 1.88.0-nightly (38c560ae6 2025-04-15)

I also add #![feature(wasip2)] to the crate attributes and here is the diff:

diff --git a/common/src/lib.rs b/common/src/lib.rs
index 25501e4f5..2ee3a78b5 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -1,5 +1,5 @@
 //! A crate to hold types and functions common to all rustpython components.
-
+#![feature(wasip2)]
 #![cfg_attr(target_os = "redox", feature(byte_slice_trim_ascii))]
 
 #[macro_use]
diff --git a/stdlib/src/lib.rs b/stdlib/src/lib.rs
index a910c5854..8da304ac6 100644
--- a/stdlib/src/lib.rs
+++ b/stdlib/src/lib.rs
@@ -1,5 +1,6 @@
 // to allow `mod foo {}` in foo.rs; clippy thinks this is a mistake/misunderstanding of
 // how `mod` works, but we want this sometimes for pymodule declarations
+#![feature(wasip2)]
 #![allow(clippy::module_inception)]
 
 #[macro_use]

Then I run the command below:

export RUSTFLAGS="-C linker=wasm-ld"
cargo build --release --target wasm32-wasip2 --features "freeze-stdlib,ssl"

It fails with the log:

warning: unused import: `utils::ToCString`
   --> vm/src/stdlib/os.rs:145:9
    |
145 |         utils::ToCString,
    |         ^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(unused_imports)]` on by default

warning: unused imports: `IntoPyException`, `Py`, and `TryFromBorrowedObject`
  --> vm/src/stdlib/signal.rs:15:19
   |
15 |         convert::{IntoPyException, TryFromBorrowedObject},
   |                   ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^
16 |         signal, Py, PyObjectRef, PyResult, VirtualMachine,
   |                 ^^

warning: `rustpython-vm` (lib) generated 2 warnings (run `cargo fix --lib -p rustpython-vm` to apply 2 suggestions)
   Compiling rustpython-stdlib v0.4.0 (/home/jzd/projects/RustPython/stdlib)
error[E0433]: failed to resolve: use of unresolved module or unlinked crate `ssl`
   --> stdlib/src/lib.rs:154:23
    |
154 |             "_ssl" => ssl::make_module,
    |                       ^^^ use of unresolved module or unlinked crate `ssl`
    |
    = help: if you wanted to use a crate named `ssl`, use `cargo add ssl` to add it to your `Cargo.toml`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `rustpython-stdlib` (lib) due to 1 previous error

What can I do to make it work? I need the feature ssl to enable python library couchdb and redis.