use of unstable library feature 'stdsimd'

[ous51m1]

how can i move on with my life

error[E0658]: use of unstable library feature 'stdsimd'
   --> /home/oussama/.cargo/registry/src/github.com-1ecc6299db9ec823/blake3-0.1.4/src/platform.rs:266:12
    |
266 |         if is_x86_feature_detected!("avx512f") && is_x86_feature_detected!("avx512vl") {
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: for more information, see https://github.com/rust-lang/rust/issues/27731
    = help: add `#![feature(stdsimd)]` to the crate attributes to enable
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
error: could not compile `blake3`.

[oconnor663]

This is a bug in nightly. See #56 and rust-lang/rust#68905.

Until this is fixed, if you have to use nightly, you will need to use a nightly version from before this bug was introduced. I don't know exactly when that was yet, but probably a couple weeks ago would be fine?

[ous51m1]

thanks @oconnor663 i switched to stable and my problem is now resolved :)

[oconnor663]

It looks like nightly-2020-02-06 is the first compiler version with this issue. Anything prior to that should work.

[oconnor663]

I've released version 0.1.5, which is a backport of af2e791. This should unbreak nightly builds of the blake3 crate with the default feature set. Only callers who enable the c_avx512 feature (which includes b3sum) will remain broken on nightly.

EDIT: The c_avx512 feature has been replaced with the c feature in version 0.2.0, but the situation is the same otherwise.

[zaynetro]

Can confirm that stable compiler can compile b3sum.

$ rustc --version
rustc 1.41.1 (f3e1a954d 2020-02-24)

[oconnor663]

This is fixed as of rustc 1.44.0-nightly (38114ff16 2020-03-21) and rustc 1.43.0-beta.596 (1eaaee956 2020-03-22).

[OfekShochat]

I get this problem with the fully updated nightly stable and beta now (1.54.0-nightly (5dc8789e3 2021-05-21), rustc 1.53.0-beta.2 (4bac69dd2 2021-05-07), rustc 1.51.0 (2fd73fabe 2021-03-23))

[oconnor663]

@OfekShochat are you saying that b3sum fails to build for you on all three toolchains? With an error message about stdsimd? I need you to give a lot more detail about what platform you're on and what commands you're running to have any chance of understanding the problem. Could you please file a new issue, with as much detail as possible?

[jianshu93]

I still have this error on 1.57. it is really strange. Any idea how to fix?

Jianshu

[ChaseLewis]

Yeah i'm getting this with avx instructions on nightly like _mm_maskz_div_ps in 1.69.0 - nightly