linux-kernel - Re: arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC

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Date:   Sat, 29 Jan 2022 13:22:57 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     "Justin M. Forbes" <jforbes@...oraproject.org>,
        llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Jason A. Donenfeld" <zx2c4@...nel.org>
Subject: Re: arch/arm/lib/xor-neon.c:30:2: warning: This code requires at
 least version 4.6 of GCC

On Sat, Jan 29, 2022 at 03:02:58PM +0800, kernel test robot wrote:
> Hi Justin,
> 
> First bad commit (maybe != root cause):

Yeah, this commit definitely does not introduce this warning, it has
been one of our longest tracked warnings.

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   169387e2aa291a4e3cb856053730fe99d6cec06f
> commit: e56e18985596617ae426ed5997fb2e737cffb58b lib/crypto: add prompts back to crypto libraries
> date:   11 days ago
> config: arm-randconfig-r004-20220128 (https://download.01.org/0day-ci/archive/20220129/202201291408.Pkylyt75-lkp@intel.com/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm cross compiling tool for clang build
>         # apt-get install binutils-arm-linux-gnueabi
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e56e18985596617ae426ed5997fb2e737cffb58b
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout e56e18985596617ae426ed5997fb2e737cffb58b
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings]
>    #warning This code requires at least version 4.6 of GCC
>     ^
>    1 warning generated.

https://github.com/ClangBuiltLinux/linux/issues/496

https://lore.kernel.org/r/20220127081227.2430-3-ardb@kernel.org/

Cheers,
Nathan