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Date:   Tue, 28 Nov 2023 13:14:41 -0800
From:   Boqun Feng <boqun.feng@gmail.com>
To:     Matthew Maurer <mmaurer@google.com>
Cc:     Jamie.Cunliffe@arm.com, Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Masahiro Yamada <masahiroy@kernel.org>, will@kernel.org,
        Gary Guo <gary@garyguo.net>,
        =?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
        Benno Lossin <benno.lossin@proton.me>,
        Andreas Hindborg <a.hindborg@samsung.com>,
        Alice Ryhl <aliceryhl@google.com>,
        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,
        linux-kbuild@vger.kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH] rust: Suppress searching builtin sysroot
Message-ID: <ZWZYQbxWmLdwAska@boqun-archlinux>
References: <20231031201752.1189213-1-mmaurer@google.com>
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[Cc Catalin as well]

On Tue, Oct 31, 2023 at 08:10:14PM +0000, Matthew Maurer wrote:
> By default, if Rust is passed `--target=foo` rather than a target.json
> file, it will infer a default sysroot if that component is installed. As
> the proposed aarch64 support uses `aarch64-unknown-none` rather than a
> target.json file, this is needed to prevent rustc from being confused
> between the custom kernel sysroot and the pre-installed one.
> 
> Signed-off-by: Matthew Maurer <mmaurer@google.com>
> ---
> 
> This patch is prompted by the issue I encountered at
> https://lore.kernel.org/all/CAGSQo01pOixiPXkW867h4vPUaAjtKtHGKhkV-rpifJvKxAf4Ww@mail.gmail.com/
> but should be generically more hermetic even if we don't end up landing
> that patch.
> 

I'm able to reproduce the issue you mentioned here after
`rustup target add aarch64-unknown-none`, and your patch fixed that.

Tested-by: Boqun Feng <boqun.feng@gmail.com>

Regards,
Boqun

>  rust/Makefile          | 1 +
>  scripts/Makefile.build | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/rust/Makefile b/rust/Makefile
> index a27f35f924ec..0403e88e19fd 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -400,6 +400,7 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
>  		--emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
>  		--crate-type rlib -L$(objtree)/$(obj) \
>  		--crate-name $(patsubst %.o,%,$(notdir $@)) $< \
> +		--sysroot=/dev/null \
>  	$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
>  
>  rust-analyzer:
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 82e3fb19fdaf..6e4ee513cc3c 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -275,6 +275,7 @@ rust_common_cmd = \
>  	--extern alloc --extern kernel \
>  	--crate-type rlib -L $(objtree)/rust/ \
>  	--crate-name $(basename $(notdir $@)) \
> +	--sysroot=/dev/null \
>  	--out-dir $(dir $@) --emit=dep-info=$(depfile)
>  
>  # `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
> -- 
> 2.42.0.820.g83a721a137-goog
>