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concurrency: add note about const-fn feature in cortex-m crate

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At the moment cortex-m crate hides const versions of some functions,
including Mutex::new(), behind the const-fn feature. So this feature
needs to be enabled to cortex-m in Cargo.toml for shared resource
examples.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
This commit is contained in:
Sergey Matyukevich
2019-07-09 23:15:49 +03:00
parent a0f62dd355
commit 18557e7486
1 changed files with 17 additions and 0 deletions
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17
src/concurrency/index.md
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@@ -555,6 +555,23 @@ fn timer() {
```
> **NOTE**
>
> At the moment `cortex-m` crate hides const versions of some functions
> (including `Mutex::new()`) behind the `const-fn` feature. So you need to add
> the `const-fn` feature to dependency on cortex-m in Cargo.toml to make
> the above examples work:
>
> ``` toml
> [dependencies.cortex-m]
> version="0.6.0"
> features=["const-fn"]
> ```
> Meanwhile `const-fn` has been working on stable Rust for some time now.
> So this additional switch in Cargo.toml will not be needed as soon as
> it is enabled in `cortex-m` by defauilt.
>
Whew! This is safe, but it is also a little unwieldy. Is there anything else
we can do?