linux-kernel - Re: MIPS toolchain

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Message-ID: <Pine.LNX.4.64.0807161716290.7399@anakin>
Date:	Wed, 16 Jul 2008 17:19:11 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Schmitz <schmitz@...kon.biophys.uni-duesseldorf.de>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-stable@...ux-mips.org,
	Dmitri Vorobiev <dmitri.vorobiev@...ial.fi>,
	Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux/MIPS Development <linux-mips@...ux-mips.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: MIPS toolchain

On Wed, 16 Jul 2008, Ralf Baechle wrote:
> Crosscompiling on a Fedora 9 machine running gcc 4.3.0 as its host compiler
> and gcc 3.4.6 for the mips-linux target results in the following build
> error:
> 
> $ make malta_defconfig
> $ make
> cc1: error: unrecognized command line option "-fno-stack-protector"
> scripts/kconfig/conf -s arch/mips/Kconfig
> cc1: error: unrecognized command line option "-fno-stack-protector"
> 
> The arch Makefile is included too late so the host compiler is feature
> tested, not the crosscompiler as intended and thus the Makefile applies
> adds -fno-stack-protector to crosscompiler's flags which fails for gcc
> 3.4.6.  The bug was introduced by e06b8b98da071f7dd78fb7822991694288047df0
> in 2.6.25; 35bb5b1e0e84cfa1a8906f7e6a77f391ff315791 did add more flags
> testing before the arch Makefile inclusion.
> 
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> 
> diff --git a/Makefile b/Makefile
> index bfde079..312fcaa 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -509,6 +509,8 @@ else
>  KBUILD_CFLAGS	+= -O2
>  endif
>  
> +include $(srctree)/arch/$(SRCARCH)/Makefile
> +
>  ifneq (CONFIG_FRAME_WARN,0)
>  KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
>  endif
> @@ -517,8 +519,6 @@ endif
>  # Arch Makefiles may override this setting
>  KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
>  
> -include $(srctree)/arch/$(SRCARCH)/Makefile
> -
>  ifdef CONFIG_FRAME_POINTER
>  KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
>  else

Thank you!

Michael Schmitz also saw this problem, but we never found what caused
it...

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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