Cross Compile fails for target i586-unknown-linux-musl

[guenhter]

Hi,

I believe this cross compile should work but I make something wrong.

Here the steps I do:

docker container run -it --rm rust:1.80 bash

apt-get update

# Install and configure clang
apt-get install -y software-properties-common lsb-release
curl -sSL https://apt.llvm.org/llvm.sh | bash

export CARGO_TARGET_I586_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-Clink-self-contained=yes -Clinker=rust-lld"
export CC_i586_unknown_linux_musl="clang-18"

# Install musl
rustup target add i586-unknown-linux-musl
apt update && apt install -y musl-tools

# Create the project
cargo new foo
cd foo
cargo add ring

# build now
cargo build --release --target i586-unknown-linux-musl

I get the error:

root@4fca3feaf339:/foo# cargo build --release --target i586-unknown-linux-musl
   Compiling ring v0.17.8
error[E0080]: evaluation of constant value failed
  --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/ring-0.17.8/src/cpu/intel.rs:28:9
   |
28 |         assert!(cfg!(target_feature = "sse") && cfg!(target_feature = "sse2"));
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'assertion failed: cfg!(target_feature = "sse") && cfg!(target_feature = "sse2")', /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/ring-0.17.8/src/cpu/intel.rs:28:9
   |
   = note: this error originates in the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0080`.
error: could not compile `ring` (lib) due to 1 previous error

What am I doing wrong?

[guenhter]

This should be enough as answer #1999