linux-kernel - [PATCH] x86_64: fix linking on 32-bit system

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Message-Id: <20060820143117.6622.22777.stgit@memento.home.lan>
Date:	Sun, 20 Aug 2006 16:31:17 +0200
From:	Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
To:	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86_64: fix linking on 32-bit system

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>

When compiling a 64-bit kernel on an Ubuntu 6.06 32bit system (whose GCC is also
a cross-compiler for x86_64) I've seen that head.o is compiled as a 64-bit file
(while it should not) and ld complaining about this during linking:

ld: warning: i386:x86-64 architecture of input file
`arch/x86_64/boot/compressed/head.o' is incompatible with i386 output

I've verified that removing -m64 from compilation flags to turn
"-m64 -traditional -m32" into "-traditional -m32" fixes the issue.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
---

 arch/x86_64/boot/compressed/Makefile |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86_64/boot/compressed/Makefile b/arch/x86_64/boot/compressed/Makefile
index f89d96f..c6bfd23 100644
--- a/arch/x86_64/boot/compressed/Makefile
+++ b/arch/x86_64/boot/compressed/Makefile
@@ -7,7 +7,9 @@ # Note all the files here are compiled/l
 #
 
 targets		:= vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o
-EXTRA_AFLAGS	:= -traditional -m32
+EXTRA_AFLAGS	:= -traditional
+#Gcc on Ubuntu 6.06 does not cope well with -m64 -m32 - it uses -m64.
+AFLAGS		:= $(subst -m64,-m32,$(AFLAGS))
 
 # cannot use EXTRA_CFLAGS because base CFLAGS contains -mkernel which conflicts with
 # -m32
-
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