linux-kernel - Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e

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Date:   Tue, 15 Sep 2020 10:40:19 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Rong Chen <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>,
        "Li, Philip" <philip.li@...el.com>, x86-ml <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        kernel-dynamic-tools <kernel-dynamic-tools@...gle.com>,
        Marco Elver <elver@...gle.com>
Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e

On Tue, Sep 15, 2020 at 10:21 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Tue, Sep 15, 2020 at 12:02:48PM -0500, Josh Poimboeuf wrote:
> > If somebody can share the .o file, I can take a look.
>
> If only I could reproduce...
>
> So I built:
>
> /home/share/src/llvm/tc-build/install/bin/clang-12 --version
> ClangBuiltLinux clang version 12.0.0 (https://github.com/llvm/llvm-project 74a9c6d7e1c49cd0e3a8e8072b8aa03f7a84caff)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/share/src/llvm/tc-build/install/bin
>
> and I don't trigger that warning even with that compiler.
>
> What I do get is a lot of those pairs:
>
> init/calibrate.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> init/calibrate.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup
> init/version.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> init/version.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup
> certs/system_keyring.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> certs/system_keyring.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup

+ Kernel-dynamic-tools

> ...
>
> and a link fail at the end.
>
> ld: arch/x86/events/core.o: in function `events_sysfs_show':
> core.c:(.text+0x469b): undefined reference to `stpcpy'
> ld: arch/x86/events/core.o: in function `events_ht_sysfs_show':
> core.c:(.text+0x46f7): undefined reference to `stpcpy'
> ld: drivers/tty/tty_io.o: in function `alloc_tty_struct':
> tty_io.c:(.text+0x2da5): undefined reference to `stpcpy'
> ld: drivers/tty/tty_io.o: in function `tty_register_device_attr':
> tty_io.c:(.text+0x6a09): undefined reference to `stpcpy'
> ld: drivers/tty/tty_io.o: in function `show_cons_active':
> tty_io.c:(.text+0xa819): undefined reference to `stpcpy'
> ld: drivers/scsi/scsi_transport_sas.o:scsi_transport_sas.c:(.text+0x6139): more undefined references to `stpcpy' follow
> make: *** [Makefile:1166: vmlinux] Error 1

b4 am https://lore.kernel.org/lkml/20200914161643.938408-1-ndesaulniers@google.com/
-o | git am

>
>
> I'm thinking clang12 is too unstable to take it seriously...

-- 
Thanks,
~Nick Desaulniers