ghdl_interface: with ghdl_e, save runtime args to JSON file

vunit/sim_if/ghdl.py

@@ -13,6 +13,7 @@
 import logging
 import subprocess
 import shlex
+from json import dump
 from sys import stdout  # To avoid output catched in non-verbose mode
 from ..exceptions import CompileError
 from ..ostools import Process
@@ -260,6 +261,13 @@ def _get_command(self, config, output_path, elaborate_only, ghdl_e, wave_file):
             cmd += sim
             if elaborate_only:
                 cmd += ["--no-run"]
+        else:
+            try:
+                os.makedirs(output_path, mode=0o777)
+            except OSError:
+                pass
+            with open(join(output_path, "args.json"), "w") as fname:
+                dump([bin_path] + sim, fname)
 
         return cmd