libero: add dummy Makefile

fusesoc relies on the Makefile timestamp to know if it should rerun the
setup stage. Add a dummy file so that one can launch build and run
stages without having to destroy and regenerate a project.

This should be removed when updating libero to the flow api.

Signed-off-by: Liam Beguin <[email protected]>

Author: liambeguin

edalize/libero.py

@@ -200,6 +200,10 @@ def configure_main(self):
         escaped_name = self.name.replace(".", "_")
         self._run_libero(script=escaped_name + "-project.tcl")
 
+        # FIXME: fusesoc relies on the Makefile timestamp
+        makefile = os.path.join(self.work_root, 'Makefile')
+        open(makefile, 'a').close()
+
     def src_file_filter(self, f):
         file_types = {
             "verilogSource": "-hdl_source {",