[llvmlinux] [arch/x86/kernel/head64.c] In function `early_make_pgtable': undefined reference to `mcount'

[Sedat Dilek]

On Tue, Jul 9, 2013 at 11:43 PM, Sedat Dilek <sedat.dilek at gmail.com> wrote:
> On Tue, Jul 9, 2013 at 11:22 PM, Jan-Simon Möller
> <jsmoeller at linuxfoundation.org> wrote:
>> Good, now compare the provided config with yours and find the option(s) which
>> differ and provoke this.
>
> That's not a good advice - as both differ a lot.
> A list of Kconfig-options which are known to be problematic (BROKEN)
> would be helpful.
>
> I think I take llvmlinux's kernel-config with CONFIG_INTEL_MEI*
> enabled and see if this boots.
>

NOPE, that did not work.
Enough testing for today.

- Sedat -

>> Then compare a gcc build with a clang build of that same file.
>>
>
> Did you look into the disassembled objdump?
> Or any other advice how to see why mcount is not referenced?
>
> - Sedat -
>
>> Best,
>> JS
>> --
>>
>> Sincerely yours,
>>
>> Jan-Simon Möller
>>
>> jsmoeller at linuxfoundation.org
>> On Tuesday 09 July 2013 23:15:20 Sedat Dilek wrote:
>>> From my build-log:
>>> [...]
>>>   LINK    vmlinux
>>>   LD      vmlinux.o
>>>   MODPOST vmlinux.o
>>>   GEN     .version
>>>   CHK     include/generated/compile.h
>>>   UPD     include/generated/compile.h
>>>   CC      init/version.o
>>>   LD      init/built-in.o
>>> arch/x86/kernel/head64.o: In function `early_make_pgtable':
>>> arch/x86/kernel/head64.c:(.init.text+0x2a): undefined reference to `mcount'
>>> arch/x86/kernel/head64.c:(.init.text+0x3e): undefined reference to `mcount'
>>> arch/x86/kernel/head64.c:(.init.text+0x4d): undefined reference to `mcount'
>>> arch/x86/kernel/head64.c:(.init.text+0xb1): undefined reference to `mcount'
>>> arch/x86/kernel/head64.c:(.init.text+0xd4): undefined reference to `mcount'
>>> arch/x86/kernel/head64.o:arch/x86/kernel/head64.c:(.init.text+0x106):
>>> more undefined references to `mcount' follow
>>> make[2]: *** [vmlinux] Error 1
>>> make[1]: *** [deb-pkg] Error 2
>>>
>>> - Sedat -