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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Sat, 14 Jan 2023 18:44:20 +0900
Message-ID: <CAK7LNAS-5UaBX4CYrt_VFZrfHxLy=M=CpT8Hb-LpH4EAntRRSw@mail.gmail.com>
Subject: Re: [PATCH 3/6] kbuild: rust_is_available: add check for `bindgen` invocation
To:     Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc:     Miguel Ojeda <ojeda@kernel.org>, linux-kbuild@vger.kernel.org,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        patches@lists.linux.dev, Alexandru Radovici <msg4alex@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>
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On Sat, Jan 14, 2023 at 8:10 AM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Thu, Jan 12, 2023 at 5:35 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
> >
> > I meant this:
> >
> > if ! bindgen_libclang_output=$(LC_ALL=C "$BINDGEN" $(dirname
> > $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null); then
> >        [snip]
> > fi
> >
> > (">/dev/null" was lost in the previous email)
>
> I used the error code in the message below. I am happy either way.
>
> Cheers,
> Miguel


Ah, I see.


How about this?


bindgen_libclang_output=$(LC_ALL=C "$BINDGEN" $(dirname
$0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null) \
         || bindgen_libclang_code=$?

if [ -n "$bindgen_libclang_code" ]; then
       echo >&2 "***"
       echo >&2 "*** Running '$BINDGEN' to check the libclang version
(used by the Rust"
       echo >&2 "*** bindings generator) failed with code
$bindgen_libclang_code. This may be caused by"
       echo >&2 "*** a failure to locate libclang. See output and docs
below for details:"
       echo >&2 "***"
       echo >&2 "$bindgen_libclang_output"
       echo >&2 "***"
       exit 1
fi


You can get the error code of bindgen without toggling -e.


-- 
Best Regards
Masahiro Yamada