include: add convenience header "nm-default.h"

This internal header file should be included by our internal source
code files and header files. It includes in one place other headers
that constitute to a minimal set of required headers. Most notably
this is <glib.h> and our "nm-glib.h" header.

Note that public header files and example source code cannot include
this file as "nm-default.h" is internal only.

include/nm-default.h

@@ -0,0 +1,59 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* NetworkManager -- Network link manager
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ * (C) Copyright 2015 Red Hat, Inc.
+ */
+
+#ifndef __NM_DEFAULT_H__
+#define __NM_DEFAULT_H__
+
+/* makefiles define NETWORKMANAGER_COMPILATION for compiling NetworkManager.
+ * Depending on which parts are compiled, different values are set. */
+#define NM_NETWORKMANAGER_COMPILATION_DEFAULT             0x0001
+#define NM_NETWORKMANAGER_COMPILATION_INSIDE_DAEMON       0x0002
+
+#ifndef NETWORKMANAGER_COMPILATION
+/* For convenience, we don't require our Makefile.am to define
+ * -DNETWORKMANAGER_COMPILATION. As we now include this internal header,
+ *  we know we do a NETWORKMANAGER_COMPILATION. */
+#define NETWORKMANAGER_COMPILATION NM_NETWORKMANAGER_COMPILATION_DEFAULT
+#endif
+
+/*****************************************************************************/
+
+/* always include these headers for our internal source files. */
+
+#include "nm-glib.h"
+#include "nm-version.h"
+#include "gsystem-local-alloc.h"
+
+/*****************************************************************************/
+
+#if (NETWORKMANAGER_COMPILATION) == NM_NETWORKMANAGER_COMPILATION_INSIDE_DAEMON
+
+/* the header is used inside src/, where additional
+ * headers are available. */
+
+#include "nm-types.h"
+#include "nm-logging.h"
+
+#endif /* NM_NETWORKMANAGER_COMPILATION_INSIDE_DAEMON */
+
+/*****************************************************************************/
+
+#endif /* __NM_DEFAULT_H__ */