linux-kernel - Re: [PATCH 1/1] rust: macros: fix redefine const

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Date:   Wed, 2 Aug 2023 21:02:08 +0100
From:   Gary Guo <gary@...yguo.net>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     changxian.cqs@...group.com, alex.gaynor@...il.com,
        benno.lossin@...ton.me, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, linux-kernel@...r.kernel.org,
        ojeda@...nel.org, rust-for-linux@...r.kernel.org,
        sergio.collado@...il.com, tate.thl@...group.com, wedsonaf@...il.com
Subject: Re: [PATCH 1/1] rust: macros: fix redefine const_name in `vtable`

On Wed,  2 Aug 2023 19:50:20 +0000
Alice Ryhl <aliceryhl@...gle.com> wrote:

> Qingsong Chen <changxian.cqs@...group.com> writes:
> >      let mut body_it = body.stream().into_iter();
> > -    let mut functions = Vec::new();
> > +    let mut functions = HashSet::new();
> 
> Please use a `BTreeSet` instead of a `HashSet`. A `HashSet` has
> non-deterministic iteration order, so this will make the macro output
> different things each time you run it.
> 
> Alice
> 

Good point.

Another way is to just use the existing `consts` HashSet to avoid
duplication. Something like

	consts.insert(gen_const_name);

after emitting the const item would probably be sufficient.

Best,
Gary