rustc 1.14.0 complains about "#![feature(path)]" error[E0554]: #[feature] may not be used on the stable release channel about pkg-config-rs HOT 6 CLOSED

Seems odd! This library doesn't use any features, though, so you may have been using an ancient historical version.

from pkg-config-rs.

It was 0.3.1.

from pkg-config-rs.

Ah ok, in that case if you update it should fix this issue

from pkg-config-rs.

Seems that pkg-config 0.3.9 depends on lazy_static, which depends on spin. spin 0.4.5 then fails.

6 | #![cfg_attr(feature = "asm", feature(asm))]
  |                              ^^^^^^^^^^^^

error[E0554]: #[feature] may not be used on the stable release channel
 --> src/lib.rs:7:42
  |
7 | #![cfg_attr(feature = "core_intrinsics", feature(core_intrinsics))]
  |                                          ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0554]: #[feature] may not be used on the stable release channel
 --> src/lib.rs:8:35
  |
8 | #![cfg_attr(feature = "const_fn", feature(const_fn))]
  |                                   ^^^^^^^^^^^^^^^^^

Furthermore, spin uses inline assembly so we get:

error: inline assembly is not stable enough for use and is subject to change (see issue #29722)

How do I use this stuff on rust stable?

It seems that lazy-static is supposed to optionally depend on spin. Therefore I took it out of the chroot. However lazy-static's cargo-build seems to always want to have it and it still fails.

from pkg-config-rs.

Some other crate is likely enabling the relevant feature in the lazy-static crate, which causes all crates to end up using it.

from pkg-config-rs.

Moved to rust-lang-nursery/lazy-static.rs#59 .

It seems that pkg-config only uses lazy_static for the tests.

from pkg-config-rs.