Makefile.am: generate static library from plugins

src/dummy.cxx

+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Just a dummy C++ file that is linked to work around an automake
+ * bug: automake uses CXXLD when at least one source is C++, but when
+ * you link a static library with a C++ source, it uses CCLD.  This
+ * causes linker problems (undefined reference to 'operator
+ * delete(void*)'), because CCLD does not link with libstdc++.
+ *
+ * By linking with this empty C++ source, automake decides to use
+ * CXXLD.
+ *
+ */