Print a warning on unknown keyword arguments on build targets.

build.py

@@ -15,6 +15,7 @@
 import coredata
 import environment
 import dependencies
+import mlog
 import copy, os
 
 class InvalidArguments(coredata.MesonException):
@@ -117,6 +118,31 @@ class ExtractedObjects():
         self.srclist = srclist
 
 class BuildTarget():
+    # All keyword arguments that we know how to handle.
+    known_kwargs = {'ui_files': True,
+                    'moc_headers' : True,
+                    'qresources' : True,
+                    'moc_sources' : True,
+                    'install' : True,
+                    'c_pch' : True,
+                    'cpp_pch' : True,
+                    'c_args' : True,
+                    'cpp_args' : True,
+                    'cs_args' : True,
+                    'link_args' : True,
+                    'link_depends': True,
+                    'include_directories': True,
+                    'dependencies' : True,
+                    'install_dir' : True,
+                    'main_class' : True,
+                    'gui_app' : True,
+                    'extra_files' : True,
+                    'install_rpath' : True,
+                    'resources' : True,
+                    'sources' : True,
+                    'objects' : True,
+                    }
+
     def __init__(self, name, subdir, is_cross, sources, objects, environment, kwargs):
         self.name = name
         self.subdir = subdir
@@ -136,6 +162,13 @@ class BuildTarget():
         self.process_sourcelist(sources)
         self.process_objectlist(objects)
         self.process_kwargs(kwargs, environment)
+        unknowns = []
+        for k in kwargs:
+            if not k in BuildTarget.known_kwargs:
+                unknowns.append(k)
+        if len(unknowns) > 0:
+            mlog.log(mlog.bold('Warning:'), 'Unknown keyword argument(s) in target %s: %s.' %
+                     (self.name, ', '.join(unknowns)))
         if len(self.sources) == 0 and len(self.generated) == 0:
             raise InvalidArguments('Build target %s has no sources.' % name)
         self.validate_sources()