linux-kernel - Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires '-mfp32'

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Date:	Tue, 5 Jan 2016 06:02:47 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	kbuild-all@...org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires
 '-mfp32'

On 01/05/2016 12:22 AM, Fengguang Wu wrote:
> On Tue, Jan 05, 2016 at 12:09:14AM -0800, Guenter Roeck wrote:
>> On 01/04/2016 11:23 PM, kbuild test robot wrote:
>>> Hi Guenter,
>>>
>>> First bad commit (maybe != root cause):
>>>
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>> head:   168309855a7d1e16db751e9c647119fe2d2dc878
>>> commit: 398c7500a1f5f74e207bd2edca1b1721b3cc1f1e MIPS: VDSO: Fix build error with binutils 2.24 and earlier
>>> date:   6 days ago
>>> config: mips-jmr3927_defconfig (attached as .config)
>>> reproduce:
>>>          wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>>>          chmod +x ~/bin/make.cross
>>>          git checkout 398c7500a1f5f74e207bd2edca1b1721b3cc1f1e
>>>          # save the attached .config to linux build tree
>>>          make.cross ARCH=mips
>>>
>>> All errors (new ones prefixed by >>):
>>>
>>>>> arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires '-mfp32'
>>>      /*
>>>      ^
>>>
>> AFAICS this is using the mips cross compiler version 4.9.0 from kernel.org [1],
>> which in turn uses binutils 2.24. At least this is what make.cross tries to install.
>
> Oops, sorry. I'm now using the debian MIPS cross compiler 5.2.1 ...
> make.cross has not been updated yet.
>
No problem. FWIW, I tested my patch with the compiler from Yocto 2.0, which
uses gcc 5.2.0 and binutils 2.25.1, with no problem.

Do you have directions on how to install a debian cross compiler into a Ubuntu system ?
Alternatively, what version of binutils does the mips cross compiler use ?

Thanks,
Guenter

>> I downloaded it and used it to compile both the attached configuration as well
>> as jmr3927_defconfig. Both are building just fine for me. On top of that,
>> arch/mips/vdso/gettimeofday.c should not build in the first place with binutils 2.24
>> (and doesn't build for me).
>>
>> What am I missing ?
>>
>> Guenter
>>
>> ---
>> [1] https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.9.0/x86_64-gcc-4.9.0-nolibc_mips-linux.tar.xz
>

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