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Message-ID: <e7c6b538-fc98-c9e2-dd15-3961aa441302@gmail.com>
Date:   Fri, 16 Jun 2023 11:14:39 -0300
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Subject: Re: [PATCH v2 09/11] kbuild: rust_is_available: handle failures
 calling `$RUSTC`/`$BINDGEN`
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To:     Miguel Ojeda <ojeda@kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>
Cc:     Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=c3=b6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Benno Lossin <benno.lossin@proton.me>,
        Alice Ryhl <aliceryhl@google.com>,
        Andreas Hindborg <nmi@metaspace.dk>,
        linux-kbuild@vger.kernel.org, rust-for-linux@vger.kernel.org,
        linux-kernel@vger.kernel.org, patches@lists.linux.dev
References: <20230616001631.463536-1-ojeda@kernel.org>
 <20230616001631.463536-10-ojeda@kernel.org>
From:   Martin Rodriguez Reboredo <yakoyoku@gmail.com>
In-Reply-To: <20230616001631.463536-10-ojeda@kernel.org>
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On 6/15/23 21:16, Miguel Ojeda wrote:
> The script already checks if `$RUSTC` and `$BINDGEN` exists via
> `command`, but the environment variables may point to a
> non-executable file, or the programs may fail for some other reason.
> While the script successfully exits with a failure as it should,
> the error given can be quite confusing depending on the shell and
> the behavior of its `command`. For instance, with `dash`:
> 
>      $ RUSTC=./mm BINDGEN=bindgen CC=clang scripts/rust_is_available.sh
>      scripts/rust_is_available.sh: 19: arithmetic expression: expecting primary: "100000 *  + 100 *  + "
> 
> Thus detect failure exit codes when calling `$RUSTC` and `$BINDGEN` and
> print a better message, in a similar way to what we do when extracting
> the `libclang` version found by `bindgen`.
> 
> Link: https://lore.kernel.org/rust-for-linux/CAK7LNAQYk6s11MASRHW6oxtkqF00EJVqhHOP=5rynWt-QDUsXw@mail.gmail.com/
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> [...]

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>