Only emit warning about "native:" on projects with minimum required version

'native:' keyword was only added in 0.54. For projects declaring
meson_version >= 0.54, warn, because those projects can and should set
the keyword. For older projects declaring support for older versions,
don't warn and use the default implicitly.

Fixes https://github.com/mesonbuild/meson/issues/6849.

mesonbuild/interpreter.py

@@ -3122,8 +3122,11 @@ external dependencies (including libraries) must go to "dependencies".''')
             return self.add_languages(args, required, self.machine_from_native_kwarg(kwargs))
         else:
             # absent 'native' means 'both' for backwards compatibility
-            mlog.warning('add_languages is missing native:, assuming languages are wanted for both host and build.',
-                         location=self.current_node)
+            tv = FeatureNew.get_target_version(self.subproject)
+            if FeatureNew.check_version(tv, '0.54.0'):
+                mlog.warning('add_languages is missing native:, assuming languages are wanted for both host and build.',
+                             location=self.current_node)
+
             success = self.add_languages(args, False, MachineChoice.BUILD)
             success &= self.add_languages(args, required, MachineChoice.HOST)
             return success

test cases/warning/2 languages missing native/meson.build

@@ -1,2 +1,3 @@
-project('languages missing native')
+project('languages missing native',
+        meson_version : '>= 0.54')
 add_languages('c')

test cases/warning/2 languages missing native/test.json

@@ -1,7 +1,7 @@
 {
   "stdout": [
     {
-      "line": "test cases/warning/2 languages missing native/meson.build:2: WARNING: add_languages is missing native:, assuming languages are wanted for both host and build."
+      "line": "test cases/warning/2 languages missing native/meson.build:3: WARNING: add_languages is missing native:, assuming languages are wanted for both host and build."
     }
   ]
 }