allow dependency checks to bubble up feature warnings to the interpreter

It would be too difficult and probably a layering violation to give an
interpreter handle to the inner guts of every dependency. What we can do
instead is let every dependency track:

- the Feature checks it can produce,
- the version attribute for when it was implemented

while leaving the interpreter in charge of actually emitting them.

1 files changed, 5 insertions, 0 deletions

diff --git a/mesonbuild/interpreter/interpreter.py b/mesonbuild/interpreter/interpreter.py
index 380cc1d..2d891d9 100644
--- a/mesonbuild/interpreter/interpreter.py
+++ b/mesonbuild/interpreter/interpreter.py
@@ -1601,6 +1601,11 @@ external dependencies (including libraries) must go to "dependencies".''')
             if wanted != actual:
                 mlog.debug(f'Current include type of {args[0]} is {actual}. Converting to requested {wanted}')
                 d = d.generate_system_dependency(wanted)
+        if d.feature_since is not None:
+            version, extra_msg = d.feature_since
+            FeatureNew.single_use(f'dep {d.name!r} custom lookup', version, self.subproject, extra_msg, node)
+        for f in d.featurechecks:
+            f.use(self.subproject, node)
         return d
 
     @FeatureNew('disabler', '0.44.0')