Support multiple args to message() and warning()

docs/markdown/Reference-manual.md

@@ -1195,6 +1195,9 @@ them for the default behaviour for each platform.
 
 This function prints its argument to stdout.
 
+**Since 0.54.0** Can take more more than one argument that will be separated by
+space.
+
 ### warning()
 
 ``` meson
@@ -1205,6 +1208,9 @@ This function prints its argument to stdout prefixed with WARNING:.
 
 *Added 0.44.0*
 
+**Since 0.54.0** Can take more more than one argument that will be separated by
+space.
+
 ### summary()
 
 ``` meson

docs/markdown/snippets/message_warning_concat.md

@@ -0,0 +1,4 @@
+## More than one argument to `message()` and `warning()`
+
+Arguments passed to `message()` and `warning()` will be printed separated by
+space.

mesonbuild/interpreter.py

@@ -2858,13 +2858,7 @@ external dependencies (including libraries) must go to "dependencies".''')
             return False
         return self.add_languages(args, required)
 
-    def get_message_string_arg(self, node):
+    def get_message_string_arg(self, arg):
-        # reduce arguments again to avoid flattening posargs
-        (posargs, _) = self.reduce_arguments(node.args)
-        if len(posargs) != 1:
-            raise InvalidArguments('Expected 1 argument, got %d' % len(posargs))
-
-        arg = posargs[0]
         if isinstance(arg, list):
             argstr = stringifyUserArguments(arg)
         elif isinstance(arg, dict):
@@ -2878,13 +2872,16 @@ external dependencies (including libraries) must go to "dependencies".''')
 
         return argstr
 
+    @noArgsFlattening
     @noKwargs
     def func_message(self, node, args, kwargs):
-        argstr = self.get_message_string_arg(node)
+        if len(args) > 1:
-        self.message_impl(argstr)
+            FeatureNew('message with more than one argument', '0.54.0').use(self.subproject)
+        args_str = [self.get_message_string_arg(i) for i in args]
+        self.message_impl(args_str)
 
-    def message_impl(self, argstr):
+    def message_impl(self, args):
-        mlog.log(mlog.bold('Message:'), argstr)
+        mlog.log(mlog.bold('Message:'), *args)
 
     @noArgsFlattening
     @permittedKwargs({'section', 'bool_yn'})
@@ -2928,11 +2925,14 @@ external dependencies (including libraries) must go to "dependencies".''')
         if main_summary:
             main_summary.dump()
 
+    @noArgsFlattening
     @FeatureNew('warning', '0.44.0')
     @noKwargs
     def func_warning(self, node, args, kwargs):
-        argstr = self.get_message_string_arg(node)
+        if len(args) > 1:
-        mlog.warning(argstr, location=node)
+            FeatureNew('warning with more than one argument', '0.54.0').use(self.subproject)
+        args_str = [self.get_message_string_arg(i) for i in args]
+        mlog.warning(*args_str, location=node)
 
     @noKwargs
     def func_error(self, node, args, kwargs):
@@ -3234,10 +3234,10 @@ external dependencies (including libraries) must go to "dependencies".''')
             d = self.dependency_impl(name, display_name, kwargs)
         except Exception:
             if not_found_message:
-                self.message_impl(not_found_message)
+                self.message_impl([not_found_message])
             raise
         if not d.found() and not_found_message:
-            self.message_impl(not_found_message)
+            self.message_impl([not_found_message])
         return d
 
     def dependency_impl(self, name, display_name, kwargs):

run_unittests.py

@@ -4534,6 +4534,14 @@ class FailureTests(BasePlatformTests):
                                r"Dependency \'notfound\' not found and fallback is disabled",
                                extra_args=['--wrap-mode=nofallback'])
 
+    def test_message(self):
+        self.assertMesonOutputs("message('Array:', ['a', 'b'])",
+                                r"Message:.* Array: \['a', 'b'\]")
+
+    def test_warning(self):
+        self.assertMesonOutputs("warning('Array:', ['a', 'b'])",
+                                r"WARNING:.* Array: \['a', 'b'\]")
+
 @unittest.skipUnless(is_windows() or is_cygwin(), "requires Windows (or Windows via Cygwin)")
 class WindowsTests(BasePlatformTests):
     '''