[PATCH] Allow for Cross compile of user tools

[Jerone Young <jyoung5-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

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This is the first of many patches to begin to make kvm source a lot
better for compiling for other architecture support (that is not x86 or
x86-64).

This patch makes it possible so that someone on an x86 machine can cross
compile for an x86-64 machine and vice versa. So now you will have
config-$(arch).mak for each architecture, with specific architecture
rules. 

An example of this is for compiling x86-64 on an x86 machine is:
make KERNELDIR=~/tmp/kvm ARCH=x86_64

This allows for someone with an x86 machine to compile for x86_64. Later
patches that I will be submitting will be for ppc and will make a few
more changes.

What I would like though is comments on how everyone feels about this
approach. We are need of something like this to start ading ppc related
code.

Signed-off-by: Jerone Young <jyoung5-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

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diff --git a/user/Makefile b/user/Makefile
index 26eb530..aebba58 100644
--- a/user/Makefile
+++ b/user/Makefile
@@ -1,5 +1,12 @@
 
-include config.mak
+ARCH ?= $(shell uname -m | sed -e s/i.86/x86/)
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build/
+
+DESTDIR ?=
+
+#include architecure specific make rules
+include config-$(ARCH).mak
 
 # cc-option
 # Usage: OP_CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
@@ -7,8 +14,8 @@ include config.mak
 cc-option = $(shell if $(CC) $(1) -S -o /dev/null -xc /dev/null \
               > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 
-CFLAGS = -I $(KERNELDIR)/include $(autodepend-flags) -g -fomit-frame-pointer \
-	-Wall -m$(bits)
+CFLAGS += -I $(KERNELDIR)/include $(autodepend-flags) -g -fomit-frame-pointer \
+	-Wall
 CFLAGS += $(call cc-option, -fno-stack-protector, "")
 CFLAGS += $(call cc-option, -fno-stack-protector-all, "")
 
@@ -18,20 +25,6 @@ CXXFLAGS = $(autodepend-flags)
 
 autodepend-flags = -MMD -MF $(dir $*).$(notdir $*).d
 
-DESTDIR = 
-
-ifeq ($(shell uname -m), x86_64)
-LIBDIR = /lib64
-cstart.o = test/cstart64.o
-bits = 64
-ldarch = elf64-x86-64
-else
-LIBDIR = /lib
-cstart.o = test/cstart.o
-bits = 32
-ldarch = elf32-i386
-endif
-
 all: kvmctl libkvm.a flatfiles
 
 kvmctl: LDFLAGS += -pthread -lrt
@@ -45,11 +38,7 @@ libkvm.a: kvmctl.o
 
 flatfiles-common = test/bootstrap test/vmexit.flat test/smp.flat
 
-flatfiles-32 =
-
-flatfiles-64 = test/access.flat test/irq.flat test/sieve.flat test/simple.flat test/stringio.flat test/memtest1.flat
-
-flatfiles: $(flatfiles-common) $(flatfiles-$(bits))
+flatfiles: $(flatfiles-common) $(flatfiles)
 
 install:
 	install -D kvmctl.h $(DESTDIR)/$(PREFIX)/include/kvmctl.h
@@ -60,13 +49,13 @@ install:
 	install -D libkvm.a $(DESTDIR)/$(PREFIX)/$(LIBDIR)/libkvm.a
 
 %.flat: %.o
-	gcc $(CFLAGS) -nostdlib -o $@ -Wl,-T,flat.lds $^
+	$(CC) $(CFLAGS) -nostdlib -o $@ -Wl,-T,flat.lds $^
 
 test/bootstrap: test/bootstrap.o
-	gcc -nostdlib -o $@ -Wl,-T,bootstrap.lds $^
+	$(CC) -nostdlib -o $@ -Wl,-T,bootstrap.lds $^
 
 %.o: %.S
-	gcc $(CFLAGS) -c -nostdlib -o $@ $^
+	$(CC) $(CFLAGS) -c -nostdlib -o $@ $^
 
 test/irq.flat: test/print.o
 
diff --git a/user/config-x86.mak b/user/config-x86.mak
new file mode 100644
index 0000000..d2d181b
--- /dev/null
+++ b/user/config-x86.mak
@@ -0,0 +1,7 @@
+LIBDIR = /lib
+cstart.o = test/cstart.o
+bits = 32
+ldarch = elf32-i386
+CFLAGS += -m32
+
+flatfiles=
diff --git a/user/config-x86_64.mak b/user/config-x86_64.mak
new file mode 100644
index 0000000..19ebc46
--- /dev/null
+++ b/user/config-x86_64.mak
@@ -0,0 +1,7 @@
+LIBDIR = /lib64
+cstart.o = test/cstart64.o
+bits = 64
+ldarch = elf64-x86-64
+CFLAGS += -m64
+
+flatfiles = test/access.flat test/irq.flat test/sieve.flat test/simple.flat test/stringio.flat test/memtest1.flat

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