Merge pull request #1350 from odewdney/Development

Reduce PROGMEM warnings

Marlin/Marlin.h

@@ -41,6 +41,25 @@
 #include "HardwareSerial.h"
 #endif
 
+
+#ifdef __GNUC__
+#ifndef GCC_VERSION2
+#define GCC_VERSION2 (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#endif
+
+#if GCC_VERSION2 < 40602 // Test for GCC < 4.6.2
+#ifdef PROGMEM
+#define MARLIN_PROGMEM __attribute__((section(".progmem.data")))
+#ifdef PSTR
+#undef PSTR
+#define PSTR(s) (__extension__({static const prog_char __c[] MARLIN_PROGMEM = (s); &__c[0];})) // Copied from pgmspace.h in avr-libc source
+#endif
+#endif
+#endif
+#endif
+
+
+
 #include "MarlinSerial.h"
 
 #ifndef cbi