[PATCH] build: check drivers class dependencies early

[David Marchand <david.marchand@redhat.com>]

Drivers implementing a class of devices (for example, drivers/event)
depend on the associated abstraction library (lib/eventdev).
This dependency is expressed in the top level meson.build for this class
(drivers/event/meson.build).

As we are making more libraries optional, custom constructs referencing
the class dependencies in some drivers meson.build (event/dlb2) may break.

It would be possible to add more checks in those drivers meson.build but
it is more straightforward to not even consider a driver meson.build when
the class dependencies are not met.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 drivers/meson.build | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/meson.build b/drivers/meson.build
index 74ae8cb96b..c375352e77 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -70,6 +70,17 @@ foreach subpath:subdirs
     else
         class = subpath
         subdir(class)
+        skip_class = false
+        foreach d:std_deps
+            if not is_variable('shared_rte_' + d)
+                skip_class = true
+                message('Disabling all @1@ drivers: missing internal dependency "@0@"'
+                        .format(d, class))
+            endif
+        endforeach
+        if skip_class
+            continue
+        endif
     endif
 
     # save class name on first occurrence
-- 
2.41.0