[Qemu-devel] qemu build fails on xen

["Michael S. Tsirkin" <mst@redhat.com>]

The following error triggers on Fedora 22:

In file included from /scm/qemu/include/hw/xen/xen_backend.h:4:0,
                 from hw/block/xen_disk.c:39:
/scm/qemu/include/hw/xen/xen_common.h:198:18: error: conflicting types for ‘ioservid_t’
 typedef uint32_t ioservid_t;
                  ^
In file included from /usr/include/xen/hvm/params.h:24:0,
                 from /usr/include/xenctrl.h:46,
                 from /scm/qemu/include/hw/xen/xen_common.h:9,
                 from /scm/qemu/include/hw/xen/xen_backend.h:4,
                 from hw/block/xen_disk.c:39:
/usr/include/xen/hvm/hvm_op.h:255:18: note: previous declaration of ‘ioservid_t’ was here
 typedef uint16_t ioservid_t;
                  ^
/scm/qemu/rules.mak:57: recipe for target 'hw/block/xen_disk.o' failed
make: *** [hw/block/xen_disk.o] Error 1
make: *** Waiting for unfinished jobs....

Reverting 3996e85c1822e05c50250f8d2d1e57b6bea1229d
Author: Paul Durrant <paul.durrant@citrix.com>
Date:   Tue Jan 20 11:06:19 2015 +0000

    Xen: Use the ioreq-server API when available


Looking at that header:

#ifndef HVM_PARAM_BUFIOREQ_EVTCHN
#define HVM_PARAM_BUFIOREQ_EVTCHN 26
#endif

#define IOREQ_TYPE_PCI_CONFIG 2


typedef uint32_t ioservid_t;


Are all polluting the global namespace, not to mention, violate the coding
style. Why not prefix them with Xen_, xen_ etc?


-- 
MST