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

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Date:	Tue, 5 Jan 2016 16:22:52 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Guenter Roeck <linux@...ck-us.net>
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 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.

> 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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