configure, meson: convert liburing detection to meson

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -315,7 +315,7 @@ xen="$default_feature"
 xen_ctrl_version="$default_feature"
 xen_pci_passthrough="auto"
 linux_aio="$default_feature"
-linux_io_uring="$default_feature"
+linux_io_uring="auto"
 cap_ng="auto"
 attr="auto"
 xfs="$default_feature"
@@ -1205,9 +1205,9 @@ for opt do
   ;;
   --enable-linux-aio) linux_aio="yes"
   ;;
-  --disable-linux-io-uring) linux_io_uring="no"
+  --disable-linux-io-uring) linux_io_uring="disabled"
   ;;
-  --enable-linux-io-uring) linux_io_uring="yes"
+  --enable-linux-io-uring) linux_io_uring="enabled"
   ;;
   --disable-attr) attr="disabled"
   ;;
@@ -3334,21 +3334,6 @@ EOF
     linux_aio=no
   fi
 fi
-##########################################
-# linux-io-uring probe
-
-if test "$linux_io_uring" != "no" ; then
-  if $pkg_config liburing; then
-    linux_io_uring_cflags=$($pkg_config --cflags liburing)
-    linux_io_uring_libs=$($pkg_config --libs liburing)
-    linux_io_uring=yes
-  else
-    if test "$linux_io_uring" = "yes" ; then
-      feature_not_found "linux io_uring" "Install liburing devel"
-    fi
-    linux_io_uring=no
-  fi
-fi
 
 ##########################################
 # TPM emulation is only on POSIX
@@ -5421,11 +5406,6 @@ fi
 if test "$linux_aio" = "yes" ; then
   echo "CONFIG_LINUX_AIO=y" >> $config_host_mak
 fi
-if test "$linux_io_uring" = "yes" ; then
-  echo "CONFIG_LINUX_IO_URING=y" >> $config_host_mak
-  echo "LINUX_IO_URING_CFLAGS=$linux_io_uring_cflags" >> $config_host_mak
-  echo "LINUX_IO_URING_LIBS=$linux_io_uring_libs" >> $config_host_mak
-fi
 if test "$vhost_scsi" = "yes" ; then
   echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
 fi
@@ -6071,7 +6051,7 @@ if test "$skip_meson" = no; then
         -Dcurl=$curl -Dglusterfs=$glusterfs -Dbzip2=$bzip2 -Dlibiscsi=$libiscsi \
         -Dlibnfs=$libnfs -Diconv=$iconv -Dcurses=$curses -Dlibudev=$libudev\
         -Drbd=$rbd -Dlzo=$lzo -Dsnappy=$snappy -Dlzfse=$lzfse \
-        -Dlibdaxctl=$libdaxctl -Dlibpmem=$libpmem \
+        -Dlibdaxctl=$libdaxctl -Dlibpmem=$libpmem -Dlinux_io_uring=$linux_io_uring \
         -Dgnutls=$gnutls -Dnettle=$nettle -Dgcrypt=$gcrypt -Dauth_pam=$auth_pam \
         -Dzstd=$zstd -Dseccomp=$seccomp -Dvirtfs=$virtfs -Dcap_ng=$cap_ng \
         -Dattr=$attr -Ddefault_devices=$default_devices -Dvirglrenderer=$virglrenderer \

meson.build

@@ -327,10 +327,11 @@ if have_system or have_tools
 endif
 libaio = cc.find_library('aio', required: false)
 zlib = dependency('zlib', required: true, kwargs: static_kwargs)
+
 linux_io_uring = not_found
-if 'CONFIG_LINUX_IO_URING' in config_host
-  linux_io_uring = declare_dependency(compile_args: config_host['LINUX_IO_URING_CFLAGS'].split(),
-                                      link_args: config_host['LINUX_IO_URING_LIBS'].split())
+if not get_option('linux_io_uring').auto() or have_block
+  linux_io_uring = dependency('liburing', required: get_option('linux_io_uring'),
+                              method: 'pkg-config', kwargs: static_kwargs)
 endif
 libxml2 = not_found
 if 'CONFIG_LIBXML2' in config_host
@@ -2785,7 +2786,7 @@ summary_info += {'brlapi support':    brlapi.found()}
 summary_info += {'vde support':       config_host.has_key('CONFIG_VDE')}
 summary_info += {'netmap support':    config_host.has_key('CONFIG_NETMAP')}
 summary_info += {'Linux AIO support': config_host.has_key('CONFIG_LINUX_AIO')}
-summary_info += {'Linux io_uring support': config_host.has_key('CONFIG_LINUX_IO_URING')}
+summary_info += {'Linux io_uring support': linux_io_uring.found()}
 summary_info += {'ATTR/XATTR support': libattr.found()}
 summary_info += {'RDMA support':      config_host.has_key('CONFIG_RDMA')}
 summary_info += {'PVRDMA support':    config_host.has_key('CONFIG_PVRDMA')}

meson_options.txt

@@ -92,6 +92,8 @@ option('libudev', type : 'feature', value : 'auto',
        description: 'Use libudev to enumerate host devices')
 option('libusb', type : 'feature', value : 'auto',
        description: 'libusb support for USB passthrough')
+option('linux_io_uring', type : 'feature', value : 'auto',
+       description: 'Linux io_uring support')
 option('lzfse', type : 'feature', value : 'auto',
        description: 'lzfse support for DMG images')
 option('lzo', type : 'feature', value : 'auto',