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

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Date:	Tue, 5 Jan 2016 00:09:14 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	kbuild-all@...org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires
 '-mfp32'

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.

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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