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Date:   Sat, 23 Sep 2023 11:43:56 +0800
From:   Gary Guo <gary@garyguo.net>
To:     Andrea Righi <andrea.righi@canonical.com>
Cc:     Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        =?UTF-8?B?QmrDtnJu?= Roy Baron <bjorn3_gh@protonmail.com>,
        Benno Lossin <benno.lossin@proton.me>,
        "Gustavo A . R . Silva" <gustavoars@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rust: fix bindgen build error with fstrict-flex-arrays
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On Tue, 15 Aug 2023 08:53:46 +0200
Andrea Righi <andrea.righi@canonical.com> wrote:

> Commit df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3") enabled
> '-fstrict-flex-arrays=3' globally, but bindgen does not recognized this
> compiler option, triggering the following build error:
> 
>  error: unknown argument: '-fstrict-flex-arrays=3', err: true
> 
> Add '-fstrict-flex-arrays' to the list of cflags that should be ignored
> by bindgen.
> 
> Fixes: df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3")
> Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

Tested-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/Makefile | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/rust/Makefile b/rust/Makefile
> index 4124bfa01798..ae2f5421da25 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -258,6 +258,7 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
>  	-fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
>  	-fzero-call-used-regs=% -fno-stack-clash-protection \
>  	-fno-inline-functions-called-once -fsanitize=bounds-strict \
> +	-fstrict-flex-arrays=% \
>  	--param=% --param asan-%
>  
>  # Derived from `scripts/Makefile.clang`.