linux-kernel - Re: m68k allmodconfig build errors

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Message-ID: <8991ac62-0239-ddfd-6378-95c4ec2fe42b@infradead.org>
Date:   Mon, 23 Jul 2018 18:49:49 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org
Subject: Re: m68k allmodconfig build errors

On 07/19/2018 10:17 PM, Finn Thain wrote:
> On Thu, 19 Jul 2018, Randy Dunlap wrote:
> 
>> Hi Geert,
>>
>> I am seeing a few errors when cross-building m68k on x86_64, using the 
>> toolchain at https://mirrors.edge.kernel.org/pub/tools/crosstool/ 
>> (thanks, Arnd). (so this is gcc 8.1.0)
>>
>> block/partitions/ldm.o: In function `ldm_partition':
>> ldm.c:(.text+0x1900): undefined reference to `strcmp'
>> ldm.c:(.text+0x1964): undefined reference to `strcmp'
>> drivers/rtc/rtc-proc.o: In function `is_rtc_hctosys':
>> rtc-proc.c:(.text+0x290): undefined reference to `strcmp'
>> drivers/watchdog/watchdog_pretimeout.o: In function `watchdog_register_governor':
>> (.text+0x142): undefined reference to `strcmp'
>>
>>
>> Adding #include <linux/string.h> does not help.
>>
>> Is this a toolchain problem or drivers or something else?
>>
> 
> This gcc build was apparently configured like so:
> 
> /home/arnd/git/gcc/configure --target=m68k-linux --enable-targets=all 
> --prefix=/home/arnd/cross/x86_64/gcc-8.1.0-nolibc/m68k-linux 
> --enable-languages=c --without-headers --disable-bootstrap --disable-nls 
> --disable-threads --disable-shared --disable-libmudflap --disable-libssp 
> --disable-libgomp --disable-decimal-float --disable-libquadmath 
> --disable-libatomic --disable-libcc1 --disable-libmpx 
> --enable-checking=release
> 
> In my own cross toolchain builds strcmp comes from glibc but this 
> toolchain has no libc at all.
> 
>> help?
>>
> 
> Linux will use the strcmp in lib/string.c unless __HAVE_ARCH_STRCMP is 
> defined in the arch headers. Grep suggests that m68k, mips, x86, xtensa, 
> arc, sh, arm64, s390 all define that macro. But maybe you could just patch 
> out that definition for build testing.

Sure, that works.  Thanks.

-- 
~Randy