[PATCH] Allow compiling i386 with an x86-64 compiler

[H. Peter Anvin]

This patch adds -m32 if gcc supports it, thus making it easier to 
compile the i386 architecture with an x86-64 compiler.

Note that it adds the option to CC, since it also affects assembly code 
and linking.  The extra level of indirection is because $(call 
cc-option) itself uses $(CC), so just doing CC += ... would cause $(CC) 
to be recursively defined.

	-hpa


Signed-Off-By: H. Peter Anvin <hpa@xxxxxxxxx>
Index: linux-2.5/arch/i386/Makefile
===================================================================
RCS file: /home/hpa/kernel/bkcvs/linux-2.5/arch/i386/Makefile,v
retrieving revision 1.72
diff -u -r1.72 Makefile
--- linux-2.5/arch/i386/Makefile	27 Oct 2004 17:27:13 -0000	1.72
+++ linux-2.5/arch/i386/Makefile	23 Nov 2004 02:04:09 -0000
@@ -20,6 +20,10 @@
 LDFLAGS_vmlinux :=
 CHECKFLAGS	+= -D__i386__
 
+# This allows compilation with an x86-64 compiler
+CC_M32		:= $(call cc-option,-m32)
+CC 		+= $(CC_M32)
+
 CFLAGS += -pipe -msoft-float
 
 # prevent gcc from keeping the stack 16 byte aligned