linux-kernel - Getting Rust to work

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Message-ID: <20210321193705.GA13699@duo.ucw.cz>
Date:   Sun, 21 Mar 2021 20:37:05 +0100
From:   Pavel Machek <pavel@....cz>
To:     ojeda@...nel.org, alex.gaynor@...il.com,
        rust-for-linux@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Getting Rust to work

Hi!

First try was on x86-32. It took me a whlie to figure out the problem,
hence the diff below.

Next I was not sure what to do with rustup. I'm not sure if advice
below is good.

Then I got failure because libclang (?) was not installed. I installed
it. But I guess that should be mentioned in docs as dependency.

With CONFIG_RUST unset, kernel builds for me. With CONFIG_RUST=y +
RUST_EXAMPLE=y... I get errors:

  RUSTC L rust/core.o
  BINDGEN rust/bindings_generated.rs
error: unknown argument: '-fmacro-prefix-map=./='
error: unknown warning option '-Wno-frame-address'; did you mean '-Wno-address'? [-Wunknown-warning-option]
./arch/x86/include/asm/bitops.h:138:9: error: 'asm goto' constructs are not supported yet
./arch/x86/include/asm/bitops.h:162:9: error: 'asm goto' constructs are not supported yet
./arch/x86/include/asm/bitops.h:201:9: error: 'asm goto' constructs are not supported yet
./include/linux/list.h:282:9: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
./include/linux/list.h:318:27: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
./include/linux/list.h:821:10: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
./include/linux/list.h:830:10: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
./arch/x86/include/asm/atomic.h:83:9: error: 'asm goto' constructs are not supported yet
./arch/x86/include/asm/atomic.h:123:9: error: 'asm goto' constructs are not supported yet
./arch/x86/include/asm/atomic.h:137:9: error: 'asm goto' constructs are not supported yet
./arch/x86/include/asm/atomic.h:152:9: error: 'asm goto' constructs are not supported yet

$ gcc --version
gcc (Debian 8.3.0-6) 8.3.0
$ rustc --version
rustc 1.52.0-nightly (61edfd591 2021-03-20)

Ideas?

Best regards,
								Pavel

diff --git a/Documentation/rust/quick-start.rst b/Documentation/rust/quick-start.rst
index 33b5cd33ecc5..d034369b3d43 100644
--- a/Documentation/rust/quick-start.rst
+++ b/Documentation/rust/quick-start.rst
@@ -16,6 +16,8 @@ Some of these requirements might be available from your Linux distribution
 under names like ``rustc``, ``rust-src``, ``rust-bindgen``, etc. However,
 at the time of writing, they are likely to not be recent enough.

+You need to have x86-64 or arm64 system.
+

 rustc
 *****
@@ -32,6 +34,8 @@ Otherwise, fetch a standalone installer or install ``rustup`` from:

     https://www.rust-lang.org

+    (if you have multiple toolchains, do rustup default nightly-i686-unknown-linux-gnu )
+

 Rust standard library source
 ****************************

-- 
http://www.livejournal.com/~pavelmachek

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