Extended reporting options (#16741)

Marlin/src/HAL/AVR/HAL.h

@@ -53,6 +53,9 @@
 // AVR PROGMEM extension for sprintf_P
 #define S_FMT "%S"
 
+// AVR PROGMEM extension for string define
+#define PGMSTR(NAM,STR) const char NAM[] PROGMEM = STR
+
 #ifndef CRITICAL_SECTION_START
   #define CRITICAL_SECTION_START()  unsigned char _sreg = SREG; cli()
   #define CRITICAL_SECTION_END()    SREG = _sreg

Marlin/src/HAL/HAL.h

@@ -36,6 +36,11 @@
   #define S_FMT "%s"
 #endif
 
+// String helper
+#ifndef PGMSTR
+  #define PGMSTR(NAM,STR) constexpr char NAM[] = STR
+#endif
+
 inline void watchdog_refresh() {
   TERN_(USE_WATCHDOG, HAL_watchdog_refresh());
 }