linux-kernel - Re: [PATCH 5/6] kbuild: rust_is_available: fix confusion when a version appears in the path

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Message-ID: <CANiq72=MsV8EXV9cib+GJd0AXbpF8YSGdDd723m7=ON4jhjXxQ@mail.gmail.com>
Date:   Sat, 14 Jan 2023 00:12:54 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Miguel Ojeda <ojeda@...nel.org>, linux-kbuild@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Subject: Re: [PATCH 5/6] kbuild: rust_is_available: fix confusion when a
 version appears in the path

On Thu, Jan 12, 2023 at 6:32 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> +set -- ${bindgen_libclang_output#**clang version}
> +bindgen_libclang_cversion=$(get_canonical_version $1)
>  bindgen_libclang_min_version=$($min_tool_version llvm)
> -bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)

Nice trick :) To be honest, I am not really fond of `set`, and in this
case it means the command is not symmetric (we remove the prefix using
parameter expansion, and the suffix via positional argument
selection), but if you prefer it that way, I think it would be fine.

However, why the double asterisk? One already matches any string,
including spaces, no?

Cheers,
Miguel