linux-kernel - Re: ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected

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Message-ID: <CAKwvOdmaD1c94WFK_GTfm0Egt6=Ck8JcwqnYR2ibsxpvG+o2mw@mail.gmail.com>
Date:   Wed, 1 Apr 2020 10:56:35 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     clang-built-linux <clang-built-linux@...glegroups.com>
Cc:     Dirk Mueller <dmueller@...e.com>, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Philip Li <philip.li@...el.com>,
        kbuild test robot <lkp@...el.com>
Subject: Re: ld.lld: warning: lld uses blx instruction, no object with
 architecture supporting feature detected

On Tue, Mar 31, 2020 at 2:20 PM kbuild test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   42595ce90b9d4a6b9d8c5a1ea78da4eeaf7e086a
> commit: e33a814e772cdc36436c8c188d8c42d019fda639 scripts/dtc: Remove redundant YYLOC global declaration
> date:   4 days ago
> config: arm-randconfig-a001-20200401 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 5227fa0c72ce55927cf4849160acb00442489937)
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout e33a814e772cdc36436c8c188d8c42d019fda639
>         # save the attached .config to linux build tree
>         COMPILER=clang make.cross ARCH=arm
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> ld.lld: warning: lld uses blx instruction, no object with architecture supporting feature detected

Apologies that the bot is repeatedly converging on this patch; it's an
artifact of us turning on LLD for the first time.  This error looks
new to me, seems it's a randconfig.  I've filed
https://github.com/ClangBuiltLinux/linux/issues/964 to follow up on
it.
-- 
Thanks,
~Nick Desaulniers