[Qemu-devel] [Bug 1014823] Re: qemu-kvm-1.0.1 compilation error on Ubuntu 12.04

[Serge Hallyn]

The bug is actually in libc (see bug 1010069).  You can work around it
using the same patch we are using in the ubuntu package,
define_AT_EMPTY_PATH.patch.  It probably won't apply cleanly upstream,
but just make sure to add

#ifndef AT_REMOVEDIR
#define AT_REMOVEDIR    0x200
#endif
#ifndef AT_EMPTY_PATH
#define AT_EMPTY_PATH   0x1000  /* Allow empty relative pathname */
#endif
#ifndef O_PATH
#define O_PATH    010000000
#endif

near the top of hw/9pfs/virtio-9p-handle.c

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https://bugs.launchpad.net/bugs/1014823

Title:
  qemu-kvm-1.0.1 compilation error on Ubuntu 12.04

Status in QEMU:
  Confirmed

Bug description:
    CC    libhw64/9pfs/virtio-9p-handle.o
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c: In function 
‘handle_update_file_cred’:
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:70:58: error: 
‘AT_EMPTY_PATH’ undeclared (first use in this function)
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:70:58: note: each 
undeclared identifier is reported only once for each function it appears in
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c: In function 
‘handle_lstat’:
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:87:34: error: 
‘AT_EMPTY_PATH’ undeclared (first use in this function)
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c: In function 
‘handle_symlink’:
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:314:62: error: 
‘AT_EMPTY_PATH’ undeclared (first use in this function)
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c: In function ‘handle_link’:
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:337:45: error: 
‘AT_EMPTY_PATH’ undeclared (first use in this function)
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c: In function 
‘handle_chown’:
  /usr/src/qemu-kvm-1.0.1/hw/9pfs/virtio-9p-handle.c:373:58: error: 
‘AT_EMPTY_PATH’ undeclared (first use in this function)
  make[1]: *** [9pfs/virtio-9p-handle.o] Error 1
  make: *** [subdir-libhw64] Error 2

  It compiled okay on 11.04.

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