Error building ring - target_feature = "sse" not found

[guenhter]

Hi,

when I run this:

cargo new foo
cd foo
cargo add ring

cross build --release --target i586-unknown-linux-musl

I get this error:

cross build --release --target i586-unknown-linux-musl
   Compiling shlex v1.3.0
   Compiling libc v0.2.158
   Compiling cfg-if v1.0.0
   Compiling spin v0.9.8
   Compiling untrusted v0.9.0
   Compiling cc v1.1.13
   Compiling getrandom v0.2.15
   Compiling ring v0.17.8
error[E0080]: evaluation of constant value failed
  --> /home/foo/.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")', /home/foo/.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

Any Idea what goes wrong here?

[Emilgardis]

this is a ring issue, you'd get the same behaviour using only a properly setup environment for cargo.

ring is doing some assumption which is not held

[Emilgardis]

briansmith/ring#1999

[Emilgardis]

so, you'll need to do RUSTFLAGS="-C target-feature=+sse2", but seems that that target doesn't support sse