Add a unittest using the Vala and C warnings test

This actually tests that -Wall, -Werror, and -w are set in the right
targets.

run_unittests.py

@@ -45,6 +45,7 @@ class LinuxlikeTests(unittest.TestCase):
         self.mconf_command = [sys.executable, os.path.join(src_root, 'mesonconf.py')]
         self.ninja_command = [detect_ninja(), '-C', self.builddir]
         self.common_test_dir = os.path.join(src_root, 'test cases/common')
+        self.vala_test_dir = os.path.join(src_root, 'test cases/vala')
         self.output = b''
         self.orig_env = os.environ.copy()
 
@@ -108,5 +109,32 @@ class LinuxlikeTests(unittest.TestCase):
         self.assertEqual(simple_dep.get_version(), '1.0')
         self.assertTrue('-lfoo' in simple_dep.get_link_args())
 
+    def test_vala_c_warnings(self):
+        testdir = os.path.join(self.vala_test_dir, '5 target glib')
+        self.init(testdir)
+        compdb = self.get_compdb()
+        vala_command = None
+        c_command = None
+        for each in compdb:
+            if each['file'].endswith('GLib.Thread.c'):
+                vala_command = each['command']
+            elif each['file'].endswith('retcode.c'):
+                c_command = each['command']
+            else:
+                m = 'Unknown file {!r} in vala_c_warnings test'.format(each['file'])
+                raise AssertionError(m)
+        self.assertIsNotNone(vala_command)
+        self.assertIsNotNone(c_command)
+        # -w suppresses all warnings, should be there in Vala but not in C
+        self.assertTrue('-w' in vala_command)
+        self.assertFalse('-w' in c_command)
+        # -Wall enables all warnings, should be there in C but not in Vala
+        self.assertFalse('-Wall' in vala_command)
+        self.assertTrue('-Wall' in c_command)
+        # -Werror converts warnings to errors, should always be there since it's
+        # injected by an unrelated piece of code and the project has werror=true
+        self.assertTrue('-Werror' in vala_command)
+        self.assertTrue('-Werror' in c_command)
+
 if __name__ == '__main__':
     unittest.main()

test cases/vala/5 target glib/GLib.Thread.vala

@@ -1,3 +1,5 @@
+extern int get_ret_code ();
+
 public class MyThread : Object {
 	public int x_times { get; private set; }
 
@@ -12,7 +14,7 @@ public class MyThread : Object {
 		}
 
 		// return & exit have the same effect
-		Thread.exit (42);
+		Thread.exit (get_ret_code ());
 		return 43;
 	}
 }

test cases/vala/5 target glib/meson.build

@@ -2,5 +2,5 @@ project('valatest', 'vala', 'c', default_options : ['werror=true'])
 
 valadeps = [dependency('glib-2.0', version : '>=2.32'), dependency('gobject-2.0')]
 
-e = executable('valaprog', 'GLib.Thread.vala', dependencies : valadeps)
+e = executable('valaprog', 'GLib.Thread.vala', 'retcode.c', dependencies : valadeps)
 test('valatest', e)

test cases/vala/5 target glib/retcode.c

@@ -0,0 +1,5 @@
+int
+get_ret_code (void)
+{
+  return 42;
+}