[PATCH] configure: define CONFIG_XEN when Xen is enabled

[Paul Durrant <paul@xxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

The recent commit da278d58a092 "accel: Move Xen accelerator code under
accel/xen/" introduced a subtle semantic change, making xen_enabled() always
return false unless CONFIG_XEN is defined prior to inclusion of sysemu/xen.h,
which appears to be the normal case. This causes various use-cases of QEMU
with Xen to break.

This patch makes sure that CONFIG_XEN is defined if --enable-xen is passed
to configure.

Fixes: da278d58a092 ("accel: Move Xen accelerator code under accel/xen/")
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: "Philippe Mathieu-Daudé" <philmd@xxxxxxxxxx>
Cc: Laurent Vivier <laurent@xxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>
---
 configure | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure b/configure
index 2acc4d1465..f1b9d129fd 100755
--- a/configure
+++ b/configure
@@ -7434,6 +7434,7 @@ if test "$virglrenderer" = "yes" ; then
   echo "VIRGL_LIBS=$virgl_libs" >> $config_host_mak
 fi
 if test "$xen" = "yes" ; then
+  echo "CONFIG_XEN=y" >> $config_host_mak
   echo "CONFIG_XEN_BACKEND=y" >> $config_host_mak
   echo "CONFIG_XEN_CTRL_INTERFACE_VERSION=$xen_ctrl_version" >> 
$config_host_mak
 fi
-- 
2.20.1