Added (or, rather, brought back) the add_languages function.

interpreter.py

@@ -832,6 +832,7 @@ class Interpreter():
                       'configure_file' : self.func_configure_file,
                       'include_directories' : self.func_include_directories,
                       'add_global_arguments' : self.func_add_global_arguments,
+                      'add_languages' : self.func_add_languages,
                       'find_program' : self.func_find_program,
                       'find_library' : self.func_find_library,
                       'configuration_data' : self.func_configuration_data,
@@ -1174,6 +1175,11 @@ class Interpreter():
             if not 'c' in langs:
                 raise InterpreterException('Compiling Vala requires a C compiler')
 
+    @noKwargs
+    @stringArgs
+    def func_add_languages(self, node, args, kwargs):
+        self.add_languages(node, args)
+
     @noKwargs
     def func_message(self, node, args, kwargs):
         # reduce arguments again to avoid flattening posargs

test cases/common/89 add language/meson.build

@@ -0,0 +1,7 @@
+project('add language', 'c')
+
+test('C', executable('cprog', 'prog.c'))
+
+add_languages('cpp')
+
+test('C++', executable('cppprog', 'prog.cc'))

test cases/common/89 add language/prog.c

@@ -0,0 +1,6 @@
+#include<stdio.h>
+
+int main(int argc, char **argv) {
+    printf("I am plain C.\n");
+    return 0;
+}

test cases/common/89 add language/prog.cc

@@ -0,0 +1,6 @@
+#include<iostream>
+
+int main(int, char**) {
+    std::cout << "I am C++.\n";
+    return 0;
+}