linux-kernel - Re: Compile issues with se7206

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Message-ID: <20140708193003.GA30984@roeck-us.net>
Date:	Tue, 8 Jul 2014 12:30:03 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Nick Krause <xerofoify@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Compile issues with se7206_defconfig

On Tue, Jul 08, 2014 at 09:24:49PM +0200, Geert Uytterhoeven wrote:
> On Tue, Jul 8, 2014 at 6:45 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> >> > net/built-in.o: In function `__sk_run_filter':
> >> > filter.c:(.text+0x3156c): undefined reference to `__fpscr_values'
> >> > filter.c:(.text+0x31760): undefined reference to `__fpscr_values'
> >> > filter.c:(.text+0x31c8c): undefined reference to `__fpscr_values'
> >> > filter.c:(.text+0x31f00): undefined reference to `__fpscr_values'
> >> > filter.c:(.text+0x323b0): undefined reference to `__fpscr_values'
> >>
> >> Toolchain issue: the compiler doesn't recognize the option to disable
> >> the FPU, so it isn't passed, cfr.
> >> www.spinics.net/lists/netdev/msg278300.html
> >
> > Seems that similar problems were fixed earlier without requiring a toolchain
> > change. What is different this time (besides the apparent difficulty to build a
> > new toolchain) ? Or am I missing something ?
> 
> sh4-linux-gcc doesn't recognize -m2a-nofpu, so that is not passed.
> It does recognize -m4a-nofpu, but when that's passed, it complains
> about opcode not valid for this cpu variant in inline asm/
> 
> Ah, it also recognizes -m4-nofpu. If I add that, se7206_defconfig builds.
> I assume a proper sh2a-linux toolchain will not recognize the -m4-nofpu,
> so it won't be passed due to $(call cc-option).
> 
> Does this sound like an acceptable solution? If yes, I'll send a patch.
> 
Sounds good to me.

Guenter
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