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

From: Paolo 'Blaisorblade' Giarrusso
Date: Sun Aug 20 2006 - 10:29:36 EST

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>

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@xxxxxxxx>

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
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/