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

From	Guenter Roeck <linux@roeck-us.net>
Newsgroups	linux.kernel
Subject	Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires '-mfp32'
Date	2016-01-05 15:10 +0100
Message-ID	<qNAtd-3SF-15@gated-at.bofh.it> (permalink)
References	<qNue6-77C-3@gated-at.bofh.it> <qNuQO-7Jz-3@gated-at.bofh.it> <qNvaa-7RZ-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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
>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires  '-mfp32' kbuild test robot <fengguang.wu@intel.com> - 2016-01-05 08:30 +0100
  Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires  '-mfp32' Guenter Roeck <linux@roeck-us.net> - 2016-01-05 09:10 +0100
    Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900'  requires '-mfp32' Fengguang Wu <fengguang.wu@intel.com> - 2016-01-05 09:30 +0100
      Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires  '-mfp32' Guenter Roeck <linux@roeck-us.net> - 2016-01-05 15:10 +0100
        Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900'  requires '-mfp32' Fengguang Wu <fengguang.wu@intel.com> - 2016-01-05 15:40 +0100
          Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires  '-mfp32' Guenter Roeck <linux@roeck-us.net> - 2016-01-05 16:20 +0100
          Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900'  requires '-mfp32' Fengguang Wu <fengguang.wu@intel.com> - 2016-01-06 13:00 +0100
            Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900'  requires '-mfp32' Fengguang Wu <fengguang.wu@intel.com> - 2016-01-06 13:10 +0100
              Re: [kbuild-all] arch/mips/vdso/gettimeofday.c:1:0: error:  '-march=r3900' requires '-mfp32' Fengguang Wu <fengguang.wu@intel.com> - 2016-01-06 13:10 +0100
        Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900'  requires '-mfp32' Ralf Baechle <ralf@linux-mips.org> - 2016-01-05 15:40 +0100

csiph-web