Filter simv command-line args starting with -cm

These confuse HTIF, so don't pass them through.

Contributed by @scottj97.

csrc/SimDTM.cc

@@ -6,6 +6,27 @@
 
 dtm_t* dtm;
 
+
+namespace {
+
+  // Remove args that will confuse dtm, such as those that require two tokens, like VCS code coverage "-cm line+cond"
+std::vector<std::string> filter_argv_for_dtm(int argc, char** argv)
+{
+  std::vector<std::string> out;
+  for (int i = 1; i < argc; ++i) { // start with 1 to skip my executable name
+    if (!strncmp(argv[i], "-cm", 3)) {
+      ++i; // skip this one and the next one
+    }
+    else {
+      out.push_back(argv[i]);
+    }
+  }
+  return out;
+}
+
+}
+
+
 extern "C" int debug_tick
 (
   unsigned char* debug_req_valid,
@@ -23,7 +44,7 @@ extern "C" int debug_tick
     s_vpi_vlog_info info;
     if (!vpi_get_vlog_info(&info))
       abort();
-    dtm = new dtm_t(std::vector<std::string>(info.argv + 1, info.argv + info.argc));
+      dtm = new dtm_t(filter_argv_for_dtm(info.argc, info.argv));
   }
 
   dtm_t::resp resp_bits;