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authorNikita Popov <npopov@redhat.com>2024-07-10 17:20:21 +0200
committerNikita Popov <npopov@redhat.com>2024-07-11 12:20:26 +0200
commit8a50bcbdceacca60126c085c7cad46aced589c87 (patch)
treead54c95ac9ab358576c4076337b9594fb8600649 /compiler/rustc_codegen_gcc/src/errors.rs
parent0fdfb61795b40037955154638fe35f20b16c8e55 (diff)
downloadrust-8a50bcbdceacca60126c085c7cad46aced589c87.tar.gz
rust-8a50bcbdceacca60126c085c7cad46aced589c87.zip
Remove extern "wasm" ABI
Remove the unstable `extern "wasm"` ABI (`wasm_abi` feature tracked
in #83788).

As discussed in https://github.com/rust-lang/rust/pull/127513#issuecomment-2220410679
and following, this ABI is a failed experiment that did not end
up being used for anything. Keeping support for this ABI in LLVM 19
would require us to switch wasm targets to the `experimental-mv`
ABI, which we do not want to do.

It should be noted that `Abi::Wasm` was internally used for two
things: The `-Z wasm-c-abi=legacy` ABI that is still used by
default on some wasm targets, and the `extern "wasm"` ABI. Despite
both being `Abi::Wasm` internally, they were not the same. An
explicit `extern "wasm"` additionally enabled the `+multivalue`
feature.

I've opted to remove `Abi::Wasm` in this patch entirely, instead
of keeping it as an ABI with only internal usage. Both
`-Z wasm-c-abi` variants are now treated as part of the normal
C ABI, just with different different treatment in
adjust_for_foreign_abi.
Diffstat (limited to 'compiler/rustc_codegen_gcc/src/errors.rs')
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