Restructure the src directory

It is split into
- /libgnucash (for the non-gui bits)
- /gnucash (for the gui)
- /common (misc source files used by both)
- /bindings (currently only holds python bindings)

This is the first step in restructuring the code. It will need much
more fine tuning later on.

common/platform.h

@@ -0,0 +1,69 @@
+/********************************************************************\
+ * 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, contact:                        *
+ *                                                                  *
+ * Free Software Foundation           Voice:  +1-617-542-5942       *
+ * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652       *
+ * Boston, MA  02110-1301,  USA       gnu@gnu.org                   *
+ *                                                                  *
+\********************************************************************/
+
+#ifndef GNC_PLATFORM_H
+#define GNC_PLATFORM_H
+
+#include "config.h"
+
+/* PLATFORM handles OS, operating environment, graphics API, and CPU */
+#define PLATFORM(GNC_FEATURE) (defined( GNC_PLATFORM_##GNC_FEATURE ) && GNC_PLATFORM_##GNC_FEATURE)
+#define COMPILER(GNC_FEATURE) (defined( GNC_COMPILER_##GNC_FEATURE ) && GNC_COMPILER_##GNC_FEATURE)
+#define HAVE(GNC_FEATURE) (defined( HAVE_##GNC_FEATURE ) && HAVE_##GNC_FEATURE)
+#define USE(GNC_FEATURE) (defined( GNC_USE_##GNC_FEATURE ) && GNC_USE_##GNC_FEATURE)
+#define ENABLE(GNC_FEATURE) (defined( ENABLE_##GNC_FEATURE ) && ENABLE_##GNC_FEATURE)
+
+/* Operating systems - low-level dependencies */
+
+/* Operating environments */
+
+/* Graphics engines */
+
+/* CPU */
+
+/* Compiler */
+
+/* COMPILER(MSVC) */
+#if defined(_MSC_VER)
+#define GNC_COMPILER_MSVC 1
+#if _MSC_VER < 1400
+#define GNC_COMPILER_MSVC7 1
+#endif
+#endif
+
+/* COMPILER(RVCT) */
+#if defined(__CC_ARM) || defined(__ARMCC__)
+#define GNC_COMPILER_RVCT 1
+#endif
+
+/* COMPILER(GCC) */
+/* --gnu option of the RVCT compiler also defines __GNUC__ */
+#if defined(__GNUC__) && !COMPILER(RVCT)
+#define GNC_COMPILER_GCC 1
+#endif
+
+/* COMPILER(MINGW) */
+#if defined(MINGW) || defined(__MINGW32__)
+#define GNC_COMPILER_MINGW 1
+#endif
+
+/* ENABLE macro defaults */
+
+#endif /* GNC_PLATFORM_H */