building workspaces can't use --features flag

i define feature in some sub-create
```
    [features]
    default=["product","dangerous_configuration"]
    dangerous_configuration=[]
    develop=[]
    product=[]
```
then,execute cargo `cargo build --features="develop"`

it can't work,only work in sub-create `default` features selectors.

`cargo build --no-default-features --all` not work too

Is it a Bug? 
