enable stdsimd

[MarcAntoine-Arnaud]

I try to launch: cargo +nightly clippy on my project and I get this error:

error[E0658]: macro is_x86_feature_detected! is unstable (see issue #0)
  --> /Users/marco/.cargo/registry/src/github.com-1ecc6299db9ec823/httparse-1.3.2/src/simd/mod.rs:72:48
   |
72 |             if cfg!(target_arch = "x86_64") && is_x86_feature_detected!("avx2") {
   |                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(stdsimd)] to the crate attributes to enable

error[E0658]: macro is_x86_feature_detected! is unstable (see issue #0)
  --> /Users/marco/.cargo/registry/src/github.com-1ecc6299db9ec823/httparse-1.3.2/src/simd/mod.rs:75:23
   |
75 |             } else if is_x86_feature_detected!("sse4.2") {
   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(stdsimd)] to the crate attributes to enable

error: aborting due to 2 previous errors

I have tried to add httparse in my dependencies with:

#![feature(stdsimd)]
extern crate httparse;

but it stay similar.

Is it possible to have some help on it ? Thanks, Marc-Antoine

[seanmonstar]

What version of rustc is used when you use +nightly? Specifically, the output of rustc +nightly -V.

[MarcAntoine-Arnaud]

it's the latest one: rustc 1.27.0-nightly (ad610bed8 2018-04-11)

[MarcAntoine-Arnaud]

You can found project here: https://github.com/media-io/phoenix-rs With the travis error: https://travis-ci.org/media-io/phoenix-rs/jobs/404466234

[seanmonstar]

That version is actually several months old. For instance, I see the output rustc 1.29.0-nightly (254f8796b 2018-07-13).

httparse uses a build script to detect if the version is at least 1.27, before enabling SIMD support. The problem is that when the nightly version of 1.27 is run, SIMD wasn't yet stable, and so requires the #![feature(...)] flag. If compiling with any stable version of the compiler, you shouldn't see an issue.