From 5033c906fdedd2c8d11e3c89aad76964191cbb8e Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 30 Sep 2020 16:55:26 -0400
Subject: [PATCH] Commentary (#2577)

---
 include/verilated_threads.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/verilated_threads.h b/include/verilated_threads.h
index 56ed7499b..baa8dcb5b 100644
--- a/include/verilated_threads.h
+++ b/include/verilated_threads.h
@@ -22,6 +22,15 @@
 #include "verilatedos.h"
 #include "verilated.h"  // for VerilatedMutex and clang annotations
 
+#ifndef VL_THREADED
+// Hitting this likely means verilated_threads.cpp is being compiled when
+// 'verilator --threads' was not used.  'verilator --threads' sets
+// VL_THREADED.
+// Alternatively it is always safe but may harm performance to always
+// define VL_THREADED for all compiles.
+# error "verilated_threads.h/cpp expected VL_THREADED (from verilator --threads)"
+#endif
+
 #include <condition_variable>
 #include <set>
 #include <vector>