Merge branch 'save_ext' into jgrpp

# Conflicts:
#	config.lib
#	src/saveload/extended_ver_sl.cpp
#	src/saveload/saveload.cpp

src/table/newgrf_debug_data.h

@@ -17,7 +17,7 @@
 #define NIP_END() { NULL, 0, 0, 0, 0 }
 
 /* Helper for filling callback tables */
-#define NIC(cb_id, base, variable, bit) { #cb_id, cpp_offsetof(base, variable), cpp_sizeof(base, variable), bit, cb_id }
+#define NIC(cb_id, base, variable, bit) { #cb_id, (ptrdiff_t)cpp_offsetof(base, variable), cpp_sizeof(base, variable), bit, cb_id }
 #define NIC_END() { NULL, 0, 0, 0, 0 }
 
 /* Helper for filling variable tables */

src/table/townname.h

@@ -11,6 +11,10 @@
 
 #include "../core/enum_type.hpp"
 
+#if defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#endif
+
 static const char * const _name_original_english_1[] = {
 	"Great ",
 	"Little ",