Feature gate allocator_api

[agerasev]

Disable unstable feature allocator_api if crate feature allocator is disabled. This allows to use this crate with stable Rust.

[schteve]

This sounds like a great idea! I might be missing something because when I test it I can't get it to build with stable (1.66.0). I get the same error I would expect if I was trying to use a feature gate. Is this perhaps something I'm doing wrong?

> cargo +stable build --no-default-features
...
error[E0554]: `#![feature]` may not be used on the stable release channel
 --> freertos-rust\src/lib.rs:1:44
  |
1 | #![cfg_attr(feature = "allocator", feature(allocator_api))]
  |                                            ^^^^^^^^^^^^^

[agerasev]

I think I got it. You are probably running this command in the repository root, in which case cargo builds all workspace members including freertos-rust-examples which enables all freertos-rust default features even with --no-default-features.
To build only freertos-rust crate you need to go to its own directory and then run cargo:

cd freertos-rust
cargo +stable build --no-default-features --features=sync,time,hooks,interrupt

[schteve]

Ah, right! Forgot about the workspace. Thanks. All works as expected for me now so I'll go ahead and merge.