Adapt http://xenbits.xen.org/linux-2.6.18-xen.hg?rev/efae51e0fa91
to solve error
variably modified 'tx_freelist' at file scope
with gcc 4.5
--- xen-4.0.1/extras/mini-os/netfront.c.orig	2010-05-22 14:39:10.000000000 +0100
+++ xen-4.0.1/extras/mini-os/netfront.c	2010-07-24 21:54:55.000000000 +0100
@@ -25,8 +25,8 @@
 
 
 
-#define NET_TX_RING_SIZE __RING_SIZE((struct netif_tx_sring *)0, PAGE_SIZE)
-#define NET_RX_RING_SIZE __RING_SIZE((struct netif_rx_sring *)0, PAGE_SIZE)
+#define NET_TX_RING_SIZE __CONST_RING_SIZE(netif_tx, PAGE_SIZE)
+#define NET_RX_RING_SIZE __CONST_RING_SIZE(netif_rx, PAGE_SIZE)
 #define GRANT_INVALID_REF 0
 
 
xen-4.0.1/extras/mini-os/lib/math.c generates the warning
'tmp.ul[1]' may be used uninitialized in this function
under gcc 4.5 which I think is incorrect
--- xen-4.0.1/extras/mini-os/minios.mk.orig	2010-02-02 20:43:00.000000000 +0000
+++ xen-4.0.1/extras/mini-os/minios.mk	2010-07-24 22:56:27.000000000 +0100
@@ -10,6 +10,7 @@
 DEF_CFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
 DEF_CFLAGS += $(call cc-option,$(CC),-fgnu89-inline)
 DEF_CFLAGS += -Wstrict-prototypes -Wnested-externs -Wpointer-arith -Winline
+DEF_CFLAGS += -Wno-uninitialized
 DEF_CPPFLAGS += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION)
 
 DEF_ASFLAGS += -D__ASSEMBLY__
gcc 4.5 complains
mm.c:321:46: error: taking address of expression of type 'void'
so make it consistent with the definition in setup.c
--- xen-4.0.1/extras/mini-os/arch/x86/mm.c.orig	2010-02-02 20:43:00.000000000 +0000
+++ xen-4.0.1/extras/mini-os/arch/x86/mm.c	2010-07-25 09:29:49.000000000 +0100
@@ -281,7 +281,7 @@
 /*
  * Mark portion of the address space read only.
  */
-extern void shared_info;
+extern char shared_info[PAGE_SIZE];
 static void set_readonly(void *text, void *etext)
 {
     unsigned long start_address =