linux-kernel - Re: [PATCH 05/13] Rust: Compiler builtins crate

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Message-ID: <CAHk-=wgJvJJtd2mpYpx5+zn_hPrSOqGqi-Pxb7e+h+anhsLnQg@mail.gmail.com>
Date:   Wed, 14 Apr 2021 12:19:21 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     ojeda@...nel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Geoffrey Thomas <geofft@...reload.com>,
        Finn Behrens <me@...enk.de>,
        Adam Bratschi-Kaye <ark.email@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>
Subject: Re: [PATCH 05/13] Rust: Compiler builtins crate

On Wed, Apr 14, 2021 at 11:46 AM <ojeda@...nel.org> wrote:
>
> We also need a helpers C source file to contain some forwarders
> to C macros and inlined functions. For the moment, we only need it
> to call the `BUG()` macro, but we will be adding more later.

Not being a Rust person, I can only guess based on random pattern
matching, but this _looks_ like these "panicking intrinsics" panic at
run-time (by calling BUG()).

Is there some way these things could cause built-time link errors
instead, so that if somebody uses 128-bit shifts, or floating point
ops in the rust code, they show up as build failures, not as run-time
ones?

Hmm?

          Linus