linux-kernel - Re: [PATCH] mips: vdso: fix DWARF2 warning

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Date:   Fri, 15 Jan 2021 12:28:03 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     tsbogend@...ha.franken.de, ndesaulniers@...gle.com,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, stable@...r.kernel.org
Subject: Re: [PATCH] mips: vdso: fix DWARF2 warning

On Fri, Jan 15, 2021 at 08:13:30PM +0100, Anders Roxell wrote:
> When building mips tinyconifg the following warning show up
> 
> make --silent --keep-going --jobs=8 O=/home/anders/src/kernel/next/out/builddir ARCH=mips CROSS_COMPILE=mips-linux-gnu- HOSTCC=clang CC=clang
> /srv/src/kernel/next/arch/mips/vdso/elf.S:14:1: warning: DWARF2 only supports one section per compilation unit
> .pushsection .note.Linux, "a",@note ; .balign 4 ; .long 2f - 1f ; .long 4484f - 3f ; .long 0 ; 1:.asciz "Linux" ; 2:.balign 4 ; 3:
> ^
> /srv/src/kernel/next/arch/mips/vdso/elf.S:34:2: warning: DWARF2 only supports one section per compilation unit
>  .section .mips_abiflags, "a"
>  ^
> 
> Rework so the mips vdso Makefile adds flag '-no-integrated-as' unless
> LLVM_IAS is defined.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/1256
> Cc: stable@...r.kernel.org # v4.19+
> Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>

I believe this is the better solution:

https://lore.kernel.org/r/20210115192622.3828545-1-natechancellor@gmail.com/

Cheers,
Nathan