Can not disable sign-ext feature for wasm32 target #109807
Description
I tried to build a wasm binary with MVP opcode only, so I disabled the features:
RUSTFLAGS='-C link-arg=-zstack-size=32768 -C target-feature=-mutable-globals,-sign-ext,-multivalue,-simd128' cargo build --release --target=wasm32-unknown-unknownI expected to see no sign-extension opcode in the wasm binary.
Instead, this happened:
$ wasm-tools parse -t target/wasm32-unknown-unknown/release/output.wasm -o hello.wat $ cat hello.wat | grep i32.ext i32.extend8_sMeta
rustc --version --verbose:
rustc 1.70.0-nightly (ec2f40c6b 2023-03-30) binary: rustc commit-hash: ec2f40c6b04f0e9850dd1f454e8639d319f4ed9b commit-date: 2023-03-30 host: x86_64-unknown-linux-gnu release: 1.70.0-nightly LLVM version: 16.0.0 Backtrace
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