[PATCH v2 1/2] hw/display: Restrict virtio-gpu-udmabuf stubs to !Linux

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

When using qemu configured with --enabled-modules, the
generic stubs are used instead of the module symbols:

  qemu-system-x86_64: -device virtio-vga,blob=on: cannot enable blob resources without udmabuf

Restrict the stubs to Linux and only link them when
CONFIG_VIRTIO_GPU is disabled (only the modularized
version is available when it is enabled).

Reported-by: Maxim R. <mrom06@ya.ru>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/553
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 .../display/virtio-gpu-udmabuf-stubs.c                         | 0
 hw/display/meson.build                                         | 3 ++-
 stubs/meson.build                                              | 1 -
 3 files changed, 2 insertions(+), 2 deletions(-)
 rename stubs/virtio-gpu-udmabuf.c => hw/display/virtio-gpu-udmabuf-stubs.c (100%)

diff --git a/stubs/virtio-gpu-udmabuf.c b/hw/display/virtio-gpu-udmabuf-stubs.c
similarity index 100%
rename from stubs/virtio-gpu-udmabuf.c
rename to hw/display/virtio-gpu-udmabuf-stubs.c
diff --git a/hw/display/meson.build b/hw/display/meson.build
index 1e6b707d3c0..861c43ff984 100644
--- a/hw/display/meson.build
+++ b/hw/display/meson.build
@@ -56,7 +56,8 @@
   virtio_gpu_ss = ss.source_set()
   virtio_gpu_ss.add(when: 'CONFIG_VIRTIO_GPU',
                     if_true: [files('virtio-gpu-base.c', 'virtio-gpu.c'), pixman])
-  virtio_gpu_ss.add(when: 'CONFIG_LINUX', if_true: files('virtio-gpu-udmabuf.c'))
+  virtio_gpu_ss.add(when: 'CONFIG_LINUX', if_true: files('virtio-gpu-udmabuf.c'),
+                                          if_false: files('virtio-gpu-udmabuf-stubs.c'))
   virtio_gpu_ss.add(when: 'CONFIG_VHOST_USER_GPU', if_true: files('vhost-user-gpu.c'))
   hw_display_modules += {'virtio-gpu': virtio_gpu_ss}
 
diff --git a/stubs/meson.build b/stubs/meson.build
index d3fa8646b38..3d7cfac608e 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -53,7 +53,6 @@
   stub_ss.add(files('semihost.c'))
   stub_ss.add(files('usb-dev-stub.c'))
   stub_ss.add(files('xen-hw-stub.c'))
-  stub_ss.add(files('virtio-gpu-udmabuf.c'))
 else
   stub_ss.add(files('qdev.c'))
 endif
-- 
2.31.1