From af9a5b4fde5e4f1f340ac125e7536f4e28bbc412 Mon Sep 17 00:00:00 2001
From: Tristan Gingold <tgingold@free.fr>
Date: Thu, 9 Apr 2020 12:53:04 +0200
Subject: ghdl.cc: avoid duplicate blackboxes.

---
 src/ghdl.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ghdl.cc b/src/ghdl.cc
index d8b42af..a5d8ca0 100644
--- a/src/ghdl.cc
+++ b/src/ghdl.cc
@@ -493,7 +493,10 @@ static void import_module(RTLIL::Design *design, GhdlSynth::Module m)
 	std::string module_name = to_str(get_module_name(m));
 
 	if (design->has(module_name)) {
-		log_cmd_error("Re-definition of module `%s'.\n", module_name.c_str());
+		if (is_valid(self_inst)) {
+			//  Error message only for non-black-boxes.
+			log_cmd_error("Re-definition of module `%s'.\n", module_name.c_str());
+		}
 		return;
 	}
 
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