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Auto merge of #117919 - daxpedda:wasm-c-abi, r=wesleywiser

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Introduce perma-unstable `wasm-c-abi` flag

Now that `wasm-bindgen` v0.2.88 supports the spec-compliant C ABI, the idea is to switch to that in a future version of Rust. In the meantime it would be good to let people test and play around with it.

This PR introduces a new perma-unstable `-Zwasm-c-abi` compiler flag, which switches to the new spec-compliant C ABI when targeting `wasm32-unknown-unknown`.

Alternatively, we could also stabilize this and then deprecate it when we switch. I will leave this to the Rust maintainers to decide.

This is a companion PR to #117918, but they could be merged independently.
MCP: https://github.com/rust-lang/compiler-team/issues/703
Tracking issue: https://github.com/rust-lang/rust/issues/122532
This commit is contained in:
bors 2024-04-19 03:35:10 +00:00
commit 13e63f7490
11 changed files with 95 additions and 44 deletions
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compiler/rustc_ty_utils/src/abi.rs
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@ -322,7 +322,7 @@ fn fn_sig_for_fn_abi<'tcx>(
#[inline]
fn conv_from_spec_abi(tcx: TyCtxt<'_>, abi: SpecAbi, c_variadic: bool) -> Conv {
use rustc_target::spec::abi::Abi::*;
match tcx.sess.target.adjust_abi(abi, c_variadic) {
match tcx.sess.target.adjust_abi(&tcx, abi, c_variadic) {
RustIntrinsic | Rust | RustCall => Conv::Rust,
// This is intentionally not using `Conv::Cold`, as that has to preserve