(svn r7759) -Merge: makefile rewrite. This merge features:

- A proper ./configure, so everything needs to be configured only once, not for every make.
 - Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
 - A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
 - Proper support for OSX universal binaries.
 - Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
 - Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.

src/os/macosx/macos.h

@@ -0,0 +1,30 @@
+/* $Id$ */
+
+#ifndef MACOS_H
+#define MACOS_H
+
+/*
+ * Functions to show the popup window
+ * use ShowMacDialog when you want to control title, message and text on the button
+ * ShowMacAssertDialog is used by assert
+ * ShowMacErrorDialog should be used when an unrecoverable error shows up. It only contains the title, which will should tell what went wrong
+ * the function then adds text that tells the user to update and then report the bug if it's present in the newest version
+ * It also quits in a nice way since we call it when we know something happened that will crash OpenTTD (like a needed pointer turns out to be NULL or similar)
+ */
+void ShowMacDialog ( const char *title, const char *message, const char *buttonLabel );
+void ShowMacAssertDialog ( const char *function, const char *file, const int line, const char *expression );
+void ShowMacErrorDialog(const char *error);
+
+// Since MacOS X users will never see an assert unless they started the game from a terminal
+// we're using a custom assert(e) macro.
+#undef assert
+
+#ifdef NDEBUG
+#define assert(e)       ((void)0)
+#else
+
+#define assert(e) \
+		(__builtin_expect(!(e), 0) ? ShowMacAssertDialog ( __func__, __FILE__, __LINE__, #e ): (void)0 )
+#endif
+
+#endif /* MACOS_H */