Add -CFLAGS, -LDFLAGS, <file>.a, <file>.o, and <file>.so options.

test_regress/t/t_flag_ldflags_so.cpp

@@ -0,0 +1,18 @@
+// -*- C++ -*-
+//*************************************************************************
+//
+// Copyright 2010-2010 by Wilson Snyder. This program is free software; you can
+// redistribute it and/or modify it under the terms of either the GNU
+// Lesser General Public License Version 3 or the Perl Artistic License.
+// Version 2.0.
+//
+// Verilator is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+//*************************************************************************
+
+extern "C" {
+    void dpii_so_library() {}
+};