linux-kernel - Re: MIPS toolchain

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Message-ID: <20080716120224.GA6061@linux-mips.org>
Date:	Wed, 16 Jul 2008 13:02:24 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	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>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: MIPS toolchain

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
--
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