Re: [next] mips: clang-14-defconfig build regression

[Nathan Chancellor <nathan@kernel.org>]

Hi Naresh,

On Thu, Mar 03, 2022 at 09:09:56AM +0530, Naresh Kamboju wrote:
> [Please ignore this email if it is already reported]
> 
> Linux next-20220302 mips builds failed [1] & [2].
> 
> Regressions found on mips:
> 
>   - mips-clang-12-defconfig
>   - mips-clang-13-allnoconfig
>   - mips-clang-12-allnoconfig
>   - mips-clang-12-tinyconfig
>   - mips-clang-13-defconfig
>   - mips-clang-11-tinyconfig
>   - mips-clang-11-defconfig
>   - mips-clang-nightly-allnoconfig
>   - mips-clang-14-tinyconfig
>   - mips-clang-14-defconfig
>   - mips-clang-11-allnoconfig
>   - mips-clang-nightly-tinyconfig
>   - mips-clang-13-tinyconfig
>   - mips-clang-nightly-defconfig
>   - mips-clang-14-allnoconfig
> 
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/1/build LLVM=1 LLVM_IAS=1
> ARCH=mips CROSS_COMPILE=mips-linux-gnu- 'HOSTCC=sccache clang'
> 'CC=sccache clang' defconfig

<snip>

> fatal error: error in backend: Invalid register name global variable

Thanks a lot for the report! Our CI caught this as well, I have filed an
issue on our tracker and the upstream LLVM one:

https://github.com/ClangBuiltLinux/linux/issues/1608
https://github.com/llvm/llvm-project/issues/54174

CC Kees, just as an FYI because of commit 200ed341b864 ("mips: Implement
"current_stack_pointer"").

Cheers,
Nathan