Re: [Qemu-devel] [PATCH 1.0 v2] configure: fix detection for xattr.h on modern distributions

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

On Wed,  9 Nov 2011 12:33:58 +0200, Avi Kivity <avi@redhat.com> wrote:
> Modern distributions place xattr.h in /usr/include/sys, and fold
> libattr.so into libc.  They also don't have an ENOATTR.
> 
> Make configure detect this, and add a qemu-xattr.h file that
> directs the #include to the right place.
> 
> Signed-off-by: Avi Kivity <avi@redhat.com>
> ---
> 
> v2: try for libc first, libattr second
> 
>  configure                     |   12 ++++++++++--
>  hw/9pfs/virtio-9p-handle.c    |    2 +-
>  hw/9pfs/virtio-9p-local.c     |    2 +-
>  hw/9pfs/virtio-9p-posix-acl.c |    2 +-
>  hw/9pfs/virtio-9p-xattr.h     |    2 +-
>  linux-user/syscall.c          |    2 +-
>  qemu-xattr.h                  |   30 ++++++++++++++++++++++++++++++
>  7 files changed, 45 insertions(+), 7 deletions(-)
>  create mode 100644 qemu-xattr.h
> 
> diff --git a/configure b/configure
> index 9e5da44..401d9a6 100755
> --- a/configure
> +++ b/configure
> @@ -129,6 +129,7 @@ xen=""
>  xen_ctrl_version=""
>  linux_aio=""
>  attr=""
> +libattr=""
>  xfs=""
> 
>  vhost_net="no"
> @@ -1961,12 +1962,16 @@ if test "$attr" != "no" ; then
>    cat > $TMPC <<EOF
>  #include <stdio.h>
>  #include <sys/types.h>
> -#include <attr/xattr.h>
> +#include <sys/xattr.h>
>  int main(void) { getxattr(NULL, NULL, NULL, 0); setxattr(NULL, NULL, NULL, 0, 0); return 0; }
>  EOF
> -  if compile_prog "" "-lattr" ; then
> +  if compile_prog "" "" ; then
> +    attr=yes
> +  # Older distros have <attr/xattr.h>, and need -lattr:
> +  elif sed -i s,sys/xattr,attr/xattr, $TMPC && compile_prog "" "-lattr" ; then
>      attr=yes
>      LIBS="-lattr $LIBS"
> +    libattr=yes
>    else
>      if test "$attr" = "yes" ; then
>        feature_not_found "ATTR"
> @@ -3032,6 +3037,9 @@ fi
>  if test "$attr" = "yes" ; then
>    echo "CONFIG_ATTR=y" >> $config_host_mak
>  fi
> +if test "$libattr" = "yes" ; then
> +  echo "CONFIG_LIBATTR=y" >> $config_host_mak
> +fi

Is this needed ? We are adding -lattr to LIBS if needed. What will
CONFIG_LIBATTR helps us to achieve ?

>  if test "$linux" = "yes" ; then
>    if test "$attr" = "yes" ; then
>      echo "CONFIG_VIRTFS=y" >> $config_host_mak
> diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c
> index c38e0e7..8d53cf0 100644
> --- a/hw/9pfs/virtio-9p-handle.c
> +++ b/hw/9pfs/virtio-9p-handle.c
> @@ -19,7 +19,7 @@
>  #include <grp.h>
>  #include <sys/socket.h>
>  #include <sys/un.h>
> -#include <attr/xattr.h>
> +#include <qemu-xattr.h>

Should this be 

#include "qemu-xattr.h"


>  #include <unistd.h>
>  #include <linux/fs.h>
>  #ifdef CONFIG_LINUX_MAGIC_H
> diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
> index 782dc0a..740f4e6 100644
> --- a/hw/9pfs/virtio-9p-local.c
> +++ b/hw/9pfs/virtio-9p-local.c
> @@ -19,7 +19,7 @@
>  #include <grp.h>
>  #include <sys/socket.h>
>  #include <sys/un.h>
> -#include <attr/xattr.h>
> +#include <qemu-xattr.h>
>  #include <linux/fs.h>
>  #ifdef CONFIG_LINUX_MAGIC_H
>  #include <linux/magic.h>
> diff --git a/hw/9pfs/virtio-9p-posix-acl.c b/hw/9pfs/virtio-9p-posix-acl.c
> index f5b392e..ff82cf0 100644
> --- a/hw/9pfs/virtio-9p-posix-acl.c
> +++ b/hw/9pfs/virtio-9p-posix-acl.c
> @@ -12,7 +12,7 @@
>   */
> 
>  #include <sys/types.h>
> -#include <attr/xattr.h>
> +#include <qemu-xattr.h>
>  #include "hw/virtio.h"
>  #include "virtio-9p.h"
>  #include "fsdev/file-op-9p.h"
> diff --git a/hw/9pfs/virtio-9p-xattr.h b/hw/9pfs/virtio-9p-xattr.h
> index 247e414..9437280 100644
> --- a/hw/9pfs/virtio-9p-xattr.h
> +++ b/hw/9pfs/virtio-9p-xattr.h
> @@ -13,7 +13,7 @@
>  #ifndef _QEMU_VIRTIO_9P_XATTR_H
>  #define _QEMU_VIRTIO_9P_XATTR_H
> 
> -#include <attr/xattr.h>
> +#include "qemu-xattr.h"
> 
>  typedef struct xattr_operations
>  {
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 9f5da36..e9c0566 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -71,7 +71,7 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
>  #include <sys/epoll.h>
>  #endif
>  #ifdef CONFIG_ATTR
> -#include <attr/xattr.h>
> +#include <qemu-xattr.h>

Should this be 

#include "qemu-xattr.h"


>  #endif
> 
>  #define termios host_termios
> diff --git a/qemu-xattr.h b/qemu-xattr.h
> new file mode 100644
> index 0000000..f910d96
> --- /dev/null
> +++ b/qemu-xattr.h
> @@ -0,0 +1,30 @@
> +/*
> + * Host xattr.h abstraction
> + *
> + * Copyright 2011 Red Hat Inc. and/or its affiliates
> + *
> + * Authors:
> + *  Avi Kivity <avi@redhat.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2, or any
> + * later version.  See the COPYING file in the top-level directory.
> + *
> + */
> +#ifndef QEMU_XATTR_H
> +#define QEMU_XATTR_H
> +
> +/*
> + * Modern distributions (e.g. Fedora 15, have no libattr.so, place attr.h
> + * in /usr/include/sys, and don't have ENOATTR.
> + */
> +
> +#include "config-host.h"
> +
> +#ifdef CONFIG_LIBATTR
> +#  include <attr/xattr.h>
> +#else
> +#  define ENOATTR ENODATA
> +#  include <sys/xattr.h>
> +#endif
> +
> +#endif

-aneesh