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Subject: Re: Build failure in -next due to 'sh: thin archives fix linking'
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <77ef6224-28f6-d71d-29d8-74b41fa26f0b@roeck-us.net>
 <20170628225837.25abba1e@roar.ozlabs.ibm.com>
From: Guenter Roeck <linux@roeck-us.net>
Message-ID: <4a610d3a-76de-7fec-40dc-61ec5ef175ee@roeck-us.net>
Date: Wed, 28 Jun 2017 07:02:02 -0700
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On 06/28/2017 05:58 AM, Nicholas Piggin wrote:
> On Wed, 28 Jun 2017 05:38:50 -0700
> Guenter Roeck <linux@roeck-us.net> wrote:
> 
>> Hi,
>>
>> I see the following build error in -next when building sh:rts7751r2dplus_defconfig.
>>
>> sh4-linux-ld: arch/sh/kernel/vsyscall/vsyscall-dummy.o: compiled for a big endian system and target is little endian
>> sh4-linux-ld: arch/sh/kernel/vsyscall/vsyscall-dummy.o: uses instructions which are incompatible with instructions used in previous modules
>> sh4-linux-ld: failed to merge target specific data of file arch/sh/kernel/vsyscall/vsyscall-dummy.o
>> make[2]: *** [arch/sh/kernel/vsyscall/vsyscall-syms.o] Error 1
>>
>> Bisect points to 'sh: thin archives fix linking' as the culprit. Bisect log is attached.
>> I tried with gcc 4.8.3 and 6.3.0, both built with buildroot for sh4eb.
> 
> Thanks for the report. In arch/sh/kernel/vsyscall/Makefile, the line:
> 
>   cmd_syscall_syms = $(LD) -r -o $@ -R $<
> 
> Can you try adding $(LDFLAGS), e.g. change it to:
> 
>   cmd_syscall_syms = $(LD) $(LDFLAGS) -r -o $@ -R $<
> 

That fixes the problem (including the missing symbols seen after reverting the offending patch).

Thanks,
Guenter