linux-kernel - Re: [PATCH v2] rust: Respect HOSTCC when linking for host

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Message-ID: <80964285-ec54-434e-8c36-9efaa363f126@gmail.com>
Date:   Tue, 19 Sep 2023 16:18:09 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Matthew Maurer <mmaurer@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        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,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v2] rust: Respect HOSTCC when linking for host

On 9/18/23 20:43, Matthew Maurer wrote:
> Currently, rustc defaults to invoking `cc`, even if `HOSTCC` is defined,
> resulting in build failures in hermetic environments where `cc` does not
> exist. This includes both hostprogs and proc-macros.
> 
> Since we are setting the linker to `HOSTCC`, we set the linker flavor to
> `gcc` explicitly.
> 
> Signed-off-by: Matthew Maurer <mmaurer@...gle.com>
> ---
> 
> Updated the patch to reflect Nick's comment that KBUILD_HOSTLDFLAGS
> should be respected as well.
> 
> I did not switch it to use HOSTLD for two reasons:
> * That variable is not globally defined - it is only available in two
>    subdirectories of tools/
> * C host scripts are linked by HOSTCC as well, even when linking a
>    collection of object files. It *prints* HOSTLD, but invokes HOSTCC.
>    See scripts/Makefile.host cmd_host-cmulti for an example.
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>