[PATCH 7 of 7] user: define and use AR in configure scripts and Makefiles

[Hollis Blanchard <hollisb@us.ibm.com>]

libkvm/Makefile uses $(AR), but it's not defined by the top-level configure.
The problem is that when cross-compiling for a 64-bit target on a 32-bit host,
32-bit ar will be used and the 64-bit code will fail to link.

user/Makefile has the same problem, and even uses plain "ar".

Add AR to configure and user/configure, and use it in the Makefiles.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -6,6 +6,7 @@ cc=gcc
 cc=gcc
 ld=ld
 objcopy=objcopy
+ar=ar
 want_module=1
 qemu_cflags=
 qemu_ldflags=
@@ -141,6 +142,7 @@ CC=$cross_prefix$cc
 CC=$cross_prefix$cc
 LD=$cross_prefix$ld
 OBJCOPY=$cross_prefix$objcopy
+AR=$cross_prefix$ar
 EOF
 
 cat <<EOF > kernel/config.kbuild
diff --git a/user/Makefile b/user/Makefile
--- a/user/Makefile
+++ b/user/Makefile
@@ -48,7 +48,7 @@ kvmtrace: $(kvmtrace_objs)
 	$(CC) $(LDFLAGS) $^ -o $@
 
 $(libcflat): $(cflatobjs)
-	ar rcs $@ $^
+	$(AR) rcs $@ $^
 
 %.o: %.S
 	$(CC) $(CFLAGS) -c -nostdlib -o $@ $^
diff --git a/user/configure b/user/configure
--- a/user/configure
+++ b/user/configure
@@ -5,6 +5,7 @@ cc=gcc
 cc=gcc
 ld=ld
 objcopy=objcopy
+ar=ar
 arch=`uname -m | sed -e s/i.86/i386/`
 processor="$arch"
 cross_prefix=
@@ -70,4 +71,5 @@ CC=$cross_prefix$cc
 CC=$cross_prefix$cc
 LD=$cross_prefix$ld
 OBJCOPY=$cross_prefix$objcopy
+AR=$cross_prefix$ar
 EOF