hw/usb: Include USB files only if necessary
Boards that do not include an USB controller should not provide
USB devices. However, when running "qemu-system-s390x -device help"
for example, there's still a usb-hub, usb-kbd, usb-mouse and
usb-tablet in the list of "supported" devices. Let's fix that
by compiling and linking the USB files only if it is really
necessary.
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/default-configs/usb.mak b/default-configs/usb.mak
index 73d8489..f4b8568 100644
--- a/default-configs/usb.mak
+++ b/default-configs/usb.mak
@@ -1,3 +1,4 @@
+CONFIG_USB=y
CONFIG_USB_TABLET_WACOM=y
CONFIG_USB_STORAGE_BOT=y
CONFIG_USB_STORAGE_UAS=y
