Regression when updating from version `1.1.31` to newer when compiling `ring` to `wasm32-unknown-unknown`

[matheus23]

Hi, when updating from cc version 1.1.31 to cc version 1.1.32, I fail to build ring for wasm32-unknown-unknown in github actions (see this PR with me testing different cc versions).

Specifically, ring generates "env" imports in its Wasm file:

  (import "env" "ring_core_0_17_8_x25519_fe_neg" (func $ring_core_0_17_8_x25519_fe_neg (;31;) (type 16)))
  (import "env" "ring_core_0_17_8_x25519_ge_scalarmult_base" (func $ring_core_0_17_8_x25519_ge_scalarmult_base (;32;) (type 3)))
  (import "env" "ring_core_0_17_8_x25519_ge_frombytes_vartime" (func $ring_core_0_17_8_x25519_ge_frombytes_vartime (;33;) (type 4)))
  (import "env" "ring_core_0_17_8_x25519_fe_invert" (func $ring_core_0_17_8_x25519_fe_invert (;34;) (type 2)))
  (import "env" "ring_core_0_17_8_x25519_fe_mul_ttt" (func $ring_core_0_17_8_x25519_fe_mul_ttt (;35;) (type 3)))

This indicates that there's some extern "C" in ring that didn't get picked up by wasm-bindgen for some reason and made it to the final .wasm.

I'd expect there to be no such imports at all. Having these imports means it's essentially not executable by Wasm hosts such as nodejs or browsers (because they don't provide an "env" module).

Downgrading cc from 1.1.32 to 1.1.31 fixes these issues.

Of course, this sounds a lot like a ring, issue, but given that this occurs when updating ccs patch version, I would've expected that ring doesn't need to change anything to keep working, right?

I'm also out of my depth here. I'd love to help debug this, but it works on my machine, just not on github actions.

[NobodyXu]

cc @madsmtm could that due to the wasm32-unknown-unknown change in the recent PR?

The one where we have to replace target.os with arch
#1225 (comment)

[madsmtm]

I don't know what's the correct thing to do, see #1126 (comment)