[PATCH-for-5.2 v2 2/4] meson: Only build vhost-user when system or tools is enabled

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

It does not make sense to select vhost-user features
without system-mode or tools. Return an error when
this configuration is selected. Example:

  $ ../configure --disable-tools --disable-system --enable-vhost-user-blk-server

  ../meson.build:755:4: ERROR: Problem encountered: vhost-user does not make sense without system or tools support enabled

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 meson.build | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/meson.build b/meson.build
index 4b789f18c17..4fc58eb2c3d 100644
--- a/meson.build
+++ b/meson.build
@@ -751,6 +751,10 @@
 
 has_statx = cc.links(statx_test)
 
+if 'CONFIG_VHOST_USER' in config_host and not (have_system or have_tools)
+    error('vhost-user does not make sense without system or tools support enabled')
+endif
+
 have_vhost_user_blk_server = (targetos == 'linux')
 
 if get_option('vhost_user_blk_server').enabled()
-- 
2.26.2