solved some compiler warnings that are now visible in arduino 1.0.

Found a couple of unused variables, that I commented.
Tried to solve the program memory warning message, and failed.

Marlin/Marlin.h

@@ -16,7 +16,6 @@
 #include "Configuration.h"
 #include "MarlinSerial.h"
 
-
 #define  FORCE_INLINE __attribute__((always_inline)) inline
 //#define SERIAL_ECHO(x) Serial << "echo: " << x;
 //#define SERIAL_ECHOLN(x) Serial << "echo: "<<x<<endl;
@@ -25,15 +24,25 @@
 //#define SERIAL_PROTOCOL(x) Serial << x;
 //#define SERIAL_PROTOCOLLN(x) Serial << x<<endl;
 
+//this is a unfinsihed attemp to removes a lot of warning messages, see:
+// http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=57011
+//typedef char prog_char PROGMEM; 
+// //#define PSTR    (s )        ((const PROGMEM char *)(s))
+// //# define MYPGM(s) (__extension__({static prog_char __c[] = (s); &__c[0];})) 
+// //#define MYPGM(s) ((const prog_char *g PROGMEM=s))
+// //#define MYPGM(s) PSTR(s)
+#define MYPGM(s)  (__extension__({static char __c[] __attribute__((__progmem__)) = (s); &__c[0];}))  //This is the normal behaviour
+//#define MYPGM(s)  (__extension__({static prog_char __c[]  = (s); &__c[0];})) //this does not work but hides the warnings
 
 
 #define SERIAL_PROTOCOL(x) MSerial.print(x);
-#define SERIAL_PROTOCOLPGM(x) serialprintPGM(PSTR(x));
+#define SERIAL_PROTOCOLPGM(x) serialprintPGM(MYPGM(x));
 #define SERIAL_PROTOCOLLN(x) {MSerial.print(x);MSerial.write('\n');}
-#define SERIAL_PROTOCOLLNPGM(x) {serialprintPGM(PSTR(x));MSerial.write('\n');}
+#define SERIAL_PROTOCOLLNPGM(x) {serialprintPGM(MYPGM(x));MSerial.write('\n');}
 
-const char errormagic[] PROGMEM ="Error:";
+
-const char echomagic[] PROGMEM ="echo:";
+const prog_char errormagic[] PROGMEM ="Error:";
+const prog_char echomagic[] PROGMEM ="echo:";
 #define SERIAL_ERROR_START serialprintPGM(errormagic);
 #define SERIAL_ERROR(x) SERIAL_PROTOCOL(x)
 #define SERIAL_ERRORPGM(x) SERIAL_PROTOCOLPGM(x)
@@ -50,7 +59,7 @@ const char echomagic[] PROGMEM ="echo:";
 
 
 //things to write to serial from Programmemory. saves 400 to 2k of RAM.
-#define SerialprintPGM(x) serialprintPGM(PSTR(x))
+#define SerialprintPGM(x) serialprintPGM(MYPGM(x))
 FORCE_INLINE void serialprintPGM(const char *str)
 {
   char ch=pgm_read_byte(str);

Marlin/Marlin.pde

@@ -167,7 +167,8 @@ static char *strchr_pointer; // just a pointer to find chars in the cmd string l
 
 const int sensitive_pins[] = SENSITIVE_PINS; // Sensitive pin list for M42
 
-static float tt = 0, bt = 0;
+//static float tt = 0;
+//static float bt = 0;
 
 //Inactivity shutdown variables
 static unsigned long previous_millis_cmd = 0;

Marlin/MarlinSerial.cpp

@@ -20,6 +20,7 @@
   Modified 28 September 2010 by Mark Sproul
 */
 
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

Marlin/MarlinSerial.h

@@ -120,7 +120,7 @@ class MarlinSerial //: public Stream
 
     FORCE_INLINE void print(const String &s)
     {
-      for (int i = 0; i < s.length(); i++) {
+      for (int i = 0; i < (int)s.length(); i++) {
         write(s[i]);
       }
     }

Marlin/cardreader.h

@@ -59,7 +59,7 @@ private:
   LsAction lsAction; //stored for recursion.
   int16_t nrFiles; //counter for the files in the current directory and recycled as position counter for getting the nrFiles'th name in the directory.
   char* diveDirName;
-  void lsDive(char *prepend,SdFile parent);
+  void lsDive(const char *prepend,SdFile parent);
 };
   
 

Marlin/cardreader.pde

@@ -40,7 +40,7 @@ char *createFilename(char *buffer,const dir_t &p) //buffer>12characters
 }
 
 
-void  CardReader::lsDive(char *prepend,SdFile parent)
+void  CardReader::lsDive(const char *prepend,SdFile parent)
 {
   dir_t p;
  uint8_t cnt=0;

Marlin/planner.cpp

@@ -107,10 +107,12 @@ volatile unsigned char block_buffer_tail;           // Index of the block to pro
 //=============================private variables ============================
 //===========================================================================
 
-// Used for the frequency limit
+#ifdef XY_FREQUENCY_LIMIT
-static unsigned char old_direction_bits = 0;               // Old direction bits. Used for speed calculations
+  // Used for the frequency limit
-static long x_segment_time[3]={0,0,0};                     // Segment times (in us). Used for speed calculations
+  static unsigned char old_direction_bits = 0;               // Old direction bits. Used for speed calculations
-static long y_segment_time[3]={0,0,0};
+  static long x_segment_time[3]={0,0,0};                     // Segment times (in us). Used for speed calculations
+  static long y_segment_time[3]={0,0,0};
+#endif
 
 // Returns the index of the next block in the ring buffer
 // NOTE: Removed modulo (%) operator, which uses an expensive divide and multiplication.
@@ -255,7 +257,7 @@ void planner_reverse_pass_kernel(block_t *previous, block_t *current, block_t *n
 // planner_recalculate() needs to go over the current plan twice. Once in reverse and once forward. This 
 // implements the reverse pass.
 void planner_reverse_pass() {
-  char block_index = block_buffer_head;
+  uint8_t block_index = block_buffer_head;
   if(((block_buffer_head-block_buffer_tail + BLOCK_BUFFER_SIZE) & (BLOCK_BUFFER_SIZE - 1)) > 3) {
     block_index = (block_buffer_head - 3) & (BLOCK_BUFFER_SIZE - 1);
     block_t *block[3] = { NULL, NULL, NULL };
@@ -294,7 +296,7 @@ void planner_forward_pass_kernel(block_t *previous, block_t *current, block_t *n
 // planner_recalculate() needs to go over the current plan twice. Once in reverse and once forward. This 
 // implements the forward pass.
 void planner_forward_pass() {
-  char block_index = block_buffer_tail;
+  uint8_t block_index = block_buffer_tail;
   block_t *block[3] = { NULL, NULL, NULL };
 
   while(block_index != block_buffer_head) {
@@ -384,7 +386,7 @@ void getHighESpeed()
     return; //do nothing
   
   float high=0;
-  char block_index = block_buffer_tail;
+  uint8_t block_index = block_buffer_tail;
   
   while(block_index != block_buffer_head) {
     float se=block_buffer[block_index].steps_e/float(block_buffer[block_index].step_event_count)*block_buffer[block_index].nominal_rate;
@@ -423,7 +425,7 @@ void check_axes_activity() {
   block_t *block;
 
   if(block_buffer_tail != block_buffer_head) {
-    char block_index = block_buffer_tail;
+    uint8_t block_index = block_buffer_tail;
     while(block_index != block_buffer_head) {
       block = &block_buffer[block_index];
       if(block->steps_x != 0) x_active++;
@@ -519,8 +521,7 @@ void plan_buffer_line(const float &x, const float &y, const float &z, const floa
   block->nominal_speed = block->millimeters * inverse_second; // (mm/sec) Always > 0
   block->nominal_rate = ceil(block->step_event_count * inverse_second); // (step/sec) Always > 0
 
-  //  segment time im micro seconds
+  
-  long segment_time = lround(1000000.0/inverse_second);
  
 
   if (block->steps_e == 0) {
@@ -538,6 +539,8 @@ void plan_buffer_line(const float &x, const float &y, const float &z, const floa
 #endif
 
 /*
+  //  segment time im micro seconds
+  long segment_time = lround(1000000.0/inverse_second);
   if ((blockcount>0) && (blockcount < (BLOCK_BUFFER_SIZE - 4))) {
     if (segment_time<minsegmenttime)  { // buffer is draining, add extra time.  The amount of time added increases if the buffer is still emptied more.
         segment_time=segment_time+lround(2*(minsegmenttime-segment_time)/blockcount);

Marlin/stepper.cpp

@@ -21,6 +21,7 @@
 /* The timer calculations of this module informed by the 'RepRap cartesian firmware' by Zack Smith
    and Philipp Tiefenbacher. */
 
+
 #include "stepper.h"
 #include "Configuration.h"
 #include "Marlin.h"
@@ -444,7 +445,7 @@ ISR(TIMER1_COMPA_vect)
     // Calculare new timer value
     unsigned short timer;
     unsigned short step_rate;
-    if (step_events_completed <= current_block->accelerate_until) {
+    if (step_events_completed <= (unsigned long int)current_block->accelerate_until) {
       
       MultiU24X24toH16(acc_step_rate, acceleration_time, current_block->acceleration_rate);
       acc_step_rate += current_block->initial_rate;
@@ -463,7 +464,7 @@ ISR(TIMER1_COMPA_vect)
         }
       #endif
     } 
-    else if (step_events_completed > current_block->decelerate_after) {   
+    else if (step_events_completed > (unsigned long int)current_block->decelerate_after) {   
       MultiU24X24toH16(step_rate, deceleration_time, current_block->acceleration_rate);
       
       if(step_rate > acc_step_rate) { // Check step_rate stays positive
@@ -678,7 +679,7 @@ void st_set_e_position(const long &e)
   CRITICAL_SECTION_END;
 }
 
-long st_get_position(char axis)
+long st_get_position(uint8_t axis)
 {
   long count_pos;
   CRITICAL_SECTION_START;

Marlin/stepper.h

@@ -34,7 +34,7 @@ void st_set_position(const long &x, const long &y, const long &z, const long &e)
 void st_set_e_position(const long &e);
 
 // Get current position in steps
-long st_get_position(char axis);
+long st_get_position(uint8_t axis);
 
 // The stepper subsystem goes to sleep when it runs out of things to execute. Call this
 // to notify the subsystem that it is time to go to work.

Marlin/temperature.cpp

@@ -67,7 +67,8 @@ int heatingtarget_raw[3]= {0, 0, 0};
 //===========================================================================
 static bool temp_meas_ready = false;
 
-static unsigned long previous_millis_heater, previous_millis_bed_heater;
+static unsigned long  previous_millis_bed_heater;
+//static unsigned long previous_millis_heater;
 
 #ifdef PIDTEMP
   //static cannot be external:
@@ -80,8 +81,8 @@ static unsigned long previous_millis_heater, previous_millis_bed_heater;
   static float pid_error;
   static float temp_iState_min;
   static float temp_iState_max;
-  static float pid_input;
+ // static float pid_input; 
-  static float pid_output;
+ // static float pid_output;
   static bool pid_reset;
  
 #endif //PIDTEMP
@@ -94,8 +95,8 @@ static unsigned long previous_millis_heater, previous_millis_bed_heater;
 // Init min and max temp with extreme values to prevent false errors during startup
   static int minttemp_0   = 0;
   static int maxttemp_0   = 16383;
-  static int minttemp_1   = 0;
+  //static int minttemp_1   = 0;
-  static int maxttemp_1   = 16383;
+  //static int maxttemp_1   = 16383;
   static int bed_minttemp = 0;
   static int bed_maxttemp = 16383;
 
@@ -268,7 +269,10 @@ int temp2analogBed(int celsius) {
     return (1023 * OVERSAMPLENR) - raw;
   #elif defined BED_USES_AD595
     return lround(celsius * (1024.0 * OVERSAMPLENR/ (5.0 * 100.0) ) );
+  #else
+    #warning No heater-type defined for the bed.
   #endif
+  return 0;
 }
 
 // Derived from RepRap FiveD extruder::getTemperature()
@@ -296,6 +300,8 @@ float analog2temp(int raw) {
     return celsius;
   #elif defined HEATER_0_USES_AD595
     return raw * ((5.0 * 100.0) / 1024.0) / OVERSAMPLENR;
+  #else
+    #error PLEASE DEFINE HEATER TYPE 
   #endif
 }
 
@@ -328,7 +334,10 @@ float analog2tempBed(int raw) {
     
   #elif defined BED_USES_AD595
     return raw * ((5.0 * 100.0) / 1024.0) / OVERSAMPLENR;
+  #else
+    #warning No heater-type defined for the bed.
   #endif
+  return 0;
 }
 
 void tp_init()

Marlin/temperature.h

@@ -86,7 +86,7 @@ FORCE_INLINE void setTargetHotend0(const float &celsius)
   #endif //PIDTEMP
 };
 FORCE_INLINE void setTargetHotend1(const float &celsius) {  target_raw[TEMPSENSOR_HOTEND_1]=temp2analog(celsius);};
-FORCE_INLINE float setTargetHotend(const float &celcius, uint8_t extruder){  
+FORCE_INLINE void setTargetHotend(const float &celcius, uint8_t extruder){  
   if(extruder == 0) setTargetHotend0(celcius);
   if(extruder == 1) setTargetHotend1(celcius);
 };
@@ -94,17 +94,19 @@ FORCE_INLINE void setTargetBed(const float &celsius)     {  target_raw[TEMPSENSO
 
 FORCE_INLINE bool isHeatingHotend0() {return heatingtarget_raw[TEMPSENSOR_HOTEND_0] > current_raw[TEMPSENSOR_HOTEND_0];};
 FORCE_INLINE bool isHeatingHotend1() {return target_raw[TEMPSENSOR_HOTEND_1] > current_raw[TEMPSENSOR_HOTEND_1];};
-FORCE_INLINE float isHeatingHotend(uint8_t extruder){  
+FORCE_INLINE bool isHeatingHotend(uint8_t extruder){  
   if(extruder == 0) return heatingtarget_raw[TEMPSENSOR_HOTEND_0] > current_raw[TEMPSENSOR_HOTEND_0];
   if(extruder == 1) return target_raw[TEMPSENSOR_HOTEND_1] > current_raw[TEMPSENSOR_HOTEND_1];
+  return false; 
 };
 FORCE_INLINE bool isHeatingBed() {return target_raw[TEMPSENSOR_BED] > current_raw[TEMPSENSOR_BED];};
 
 FORCE_INLINE bool isCoolingHotend0() {return target_raw[TEMPSENSOR_HOTEND_0] < current_raw[TEMPSENSOR_HOTEND_0];};
 FORCE_INLINE bool isCoolingHotend1() {return target_raw[TEMPSENSOR_HOTEND_1] < current_raw[TEMPSENSOR_HOTEND_1];};
-FORCE_INLINE float isCoolingHotend(uint8_t extruder){  
+FORCE_INLINE bool isCoolingHotend(uint8_t extruder){  
   if(extruder == 0) return target_raw[TEMPSENSOR_HOTEND_0] < current_raw[TEMPSENSOR_HOTEND_0];
   if(extruder == 1) return target_raw[TEMPSENSOR_HOTEND_1] < current_raw[TEMPSENSOR_HOTEND_1];
+  return false; 
 };
 FORCE_INLINE bool isCoolingBed() {return target_raw[TEMPSENSOR_BED] < current_raw[TEMPSENSOR_BED];};
 

Marlin/ultralcd.h

@@ -1,7 +1,7 @@
 #ifndef __ULTRALCDH
 #define __ULTRALCDH
 #include "Configuration.h"
-
+#include "Marlin.h"
 #ifdef ULTRA_LCD
 
   void lcd_status();
@@ -104,7 +104,6 @@
             curencoderpos=maxlines*lcdslow; 
         } 
         lastencoderpos=encoderpos=curencoderpos;
-        int lastactiveline=activeline;
         activeline=curencoderpos/lcdslow;
         if(activeline<0) activeline=0;
         if(activeline>LCD_HEIGHT-1) activeline=LCD_HEIGHT-1;
@@ -137,7 +136,7 @@
 
 
   #define LCD_MESSAGE(x) lcd_status(x);
-  #define LCD_MESSAGEPGM(x) lcd_statuspgm(PSTR(x));
+  #define LCD_MESSAGEPGM(x) lcd_statuspgm(MYPGM(x));
   #define LCD_STATUS lcd_status()
 #else //no lcd
   #define LCD_STATUS

Marlin/ultralcd.pde

@@ -53,7 +53,7 @@ void lcdProgMemprint(const char *str)
     ch=pgm_read_byte(++str);
   }
 }
-#define lcdprintPGM(x) lcdProgMemprint(PSTR(x))
+#define lcdprintPGM(x) lcdProgMemprint(MYPGM(x))
 
 
 //===========================================================================
@@ -159,8 +159,8 @@ void lcd_status()
 {
   #ifdef ULTIPANEL
     static uint8_t oldbuttons=0;
-    static long previous_millis_buttons=0;
+    //static long previous_millis_buttons=0;
-    static long previous_lcdinit=0;
+    //static long previous_lcdinit=0;
   //  buttons_check(); // Done in temperature interrupt
     //previous_millis_buttons=millis();