From: Paul Menzel <pmenzel@molgen.mpg.de>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Cc: Derek Parker <parkerderek86@gmail.com>,
Dmitrii Okunev <xaionaro@gmail.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: clang/ld.lld build fails with `can't create dynamic relocation R_PPC64_ADDR64 against local symbol in readonly segment`
Date: Thu, 12 Aug 2021 01:09:31 +0200 [thread overview]
Message-ID: <a11ac72e-e46c-5867-1a2e-2bc538232e6f@molgen.mpg.de> (raw)
In-Reply-To: <886ac4a5-ad30-b27f-0b80-ec233c571e81@csgroup.eu>
Dear Christophe,
Am 11.08.21 um 16:10 schrieb Christophe Leroy:
> Le 10/08/2021 à 20:38, Paul Menzel a écrit :
>> Am 29.07.21 um 10:23 schrieb Paul Menzel:
>>
>>> I just wanted to make you aware that building Linux for ppc64le with
>>> clang/lld.ld fails with [1]:
>>>
>>> ld.lld: error: can't create dynamic relocation R_PPC64_ADDR64
>>> against symbol: empty_zero_page in readonly segment; recompile object
>>> files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in
>>> the output
>>> >>> defined in arch/powerpc/kernel/head_64.o
>>> >>> referenced by
>>> arch/powerpc/kernel/head_64.o:(___ksymtab+empty_zero_page+0x0)
>>>
>>> The patch below from one of the comments [2] fixes it.
>>>
>>> --- i/arch/powerpc/Makefile
>>> +++ w/arch/powerpc/Makefile
>>> @@ -122,7 +122,7 @@ cflags-$(CONFIG_STACKPROTECTOR) +=
>>> -mstack-protector-guard-reg=r2
>>> endif
>>>
>>> LDFLAGS_vmlinux-y := -Bstatic
>>> -LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
>>> +LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie -z notext
>>> LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
>>> LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)
>>
>> Any comments, if this is the right fix? Current Linux master branch
>> still fails to build with `LLVM=1` on Ubuntu 21.04 without this change.
>
> Which kernel version are you building ?
>
> Since
> https://github.com/linuxppc/linux/commit/45b30fafe528601f1a4449c9d68d8ebe7bbc39ad
> , empty_zero_page[] is in arch/powerpc/mm/mem.c not in
> arch/powerpc/kernel/head_64.o
>
> Do you still have the issue with kernel 5.14 ?
Yes, before sending the message, I reproduced it with
$ git describe
v5.14-rc5-2-g9a73fa375d58
containing the commit you mentioned.
Kind regards,
Paul
next prev parent reply other threads:[~2021-08-11 23:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 8:23 clang/ld.lld build fails with `can't create dynamic relocation R_PPC64_ADDR64 against local symbol in readonly segment` Paul Menzel
2021-08-10 18:38 ` Paul Menzel
2021-08-11 14:10 ` Christophe Leroy
2021-08-11 23:09 ` Paul Menzel [this message]
2021-08-12 5:46 ` Michael Ellerman
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