Fix wasm32-unknown-unknown target build (RustPython#6278)

Author: moreal

Cargo.toml

@@ -162,7 +162,7 @@ ascii = "1.1"
 bitflags = "2.9.4"
 bstr = "1"
 cfg-if = "1.0"
-chrono = "0.4.42"
+chrono = { version = "0.4.42", default-features = false, features = ["clock", "oldtime", "std"] }
 constant_time_eq = "0.4"
 criterion = { version = "0.7", features = ["html_reports"] }
 crossbeam-utils = "0.8.21"

crates/vm/Cargo.toml

@@ -46,7 +46,7 @@ bitflags = { workspace = true }
 bstr = { workspace = true }
 cfg-if = { workspace = true }
 crossbeam-utils = { workspace = true }
-chrono = { workspace = true, features = ["wasmbind"] }
+chrono = { workspace = true }
 constant_time_eq = { workspace = true }
 flame = { workspace = true, optional = true }
 getrandom = { workspace = true }
@@ -150,7 +150,6 @@ features = [
 
 [target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]
 wasm-bindgen = { workspace = true, optional = true }
-getrandom = { workspace = true }
 
 [build-dependencies]
 glob = { workspace = true }

wasm/wasm-unknown-test/src/lib.rs

@@ -1,5 +1,6 @@
 use rustpython_vm::{Interpreter, eval};
 
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn eval(s: *const u8, l: usize) -> u32 {
     let src = std::slice::from_raw_parts(s, l);
     let src = std::str::from_utf8(src).unwrap();