Created path_join function.

mesonbuild/interpreter.py

@@ -1196,6 +1196,7 @@ class Interpreter():
                       'declare_dependency': self.func_declare_dependency,
                       'assert': self.func_assert,
                       'environment' : self.func_environment,
+                      'path_join' : self.func_path_join,
                      }
 
     def parse_project(self):
@@ -2237,6 +2238,15 @@ class Interpreter():
     def func_environment(self, node, args, kwargs):
         return EnvironmentVariablesHolder()
 
+    @stringArgs
+    @noKwargs
+    def func_path_join(self, node, args, kwargs):
+        if isinstance(args, str):
+            st = (args,)
+        else:
+            st = tuple(args)
+        return os.path.join(*args).replace('\\', '/')
+
     def flatten(self, args):
         if isinstance(args, mparser.StringNode):
             return args.value

test cases/common/119 pathjoin/meson.build

@@ -0,0 +1,9 @@
+project('pathjoin', 'c')
+
+assert(path_join('foo') == 'foo', 'Single argument join is broken')
+assert(path_join('foo', 'bar') == 'foo/bar', 'Path joining is broken')
+assert(path_join('foo', 'bar', 'baz') == 'foo/bar/baz', 'Path joining is broken')
+assert(path_join('/foo', 'bar') == '/foo/bar', 'Path joining is broken')
+assert(path_join('foo', '/bar') == '/bar', 'Absolute path joining is broken')
+assert(path_join('/foo', '/bar') == '/bar', 'Absolute path joining is broken')
+