Make arc support (G2/G3) configurable

Saves about 2669 bytes when deactivated. (About 1% for a AT2560, about __4%__ for a AT644!)

Marlin/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/Marlin_main.cpp

@@ -506,7 +506,9 @@ void stop();
 void get_available_commands();
 void process_next_command();
 
-void plan_arc(float target[NUM_AXIS], float* offset, uint8_t clockwise);
+#if ENABLED(ARC_SUPPORT)
+  void plan_arc(float target[NUM_AXIS], float* offset, uint8_t clockwise);
+#endif
 
 void serial_echopair_P(const char* s_P, int v)           { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_P(const char* s_P, long v)          { serialprintPGM(s_P); SERIAL_ECHO(v); }
@@ -2461,7 +2463,8 @@ inline void gcode_G0_G1() {
  * G2: Clockwise Arc
  * G3: Counterclockwise Arc
  */
-inline void gcode_G2_G3(bool clockwise) {
+#if ENABLED(ARC_SUPPORT)
+  inline void gcode_G2_G3(bool clockwise) {
     if (IsRunning()) {
 
       #if ENABLED(SF_ARC_FIX)
@@ -2486,7 +2489,8 @@ inline void gcode_G2_G3(bool clockwise) {
 
       refresh_cmd_timeout();
     }
-}
+  }
+#endif
 
 /**
  * G4: Dwell S<seconds> or P<milliseconds>
@@ -6484,7 +6488,7 @@ void process_next_command() {
         break;
 
       // G2, G3
-      #if DISABLED(SCARA)
+      #if ENABLED(ARC_SUPPORT) & DISABLED(SCARA)
         case 2: // G2  - CW ARC
         case 3: // G3  - CCW ARC
           gcode_G2_G3(codenum == 2);
@@ -7423,7 +7427,8 @@ void prepare_move() {
   set_current_to_destination();
 }
 
-/**
+#if ENABLED(ARC_SUPPORT)
+  /**
    * Plan an arc in 2 dimensions
    *
    * The arc is approximated by generating many small linear segments.
@@ -7432,11 +7437,11 @@ void prepare_move() {
    * larger segments will tend to be more efficient. Your slicer should have
    * options for G2/G3 arc generation. In future these options may be GCode tunable.
    */
-void plan_arc(
+  void plan_arc(
     float target[NUM_AXIS], // Destination position
     float* offset,          // Center of rotation relative to current_position
     uint8_t clockwise       // Clockwise?
-) {
+  ) {
 
     float radius = hypot(offset[X_AXIS], offset[Y_AXIS]),
           center_X = current_position[X_AXIS] + offset[X_AXIS],
@@ -7563,7 +7568,8 @@ void plan_arc(
     // motion control system might still be processing the action and the real tool position
     // in any intermediate location.
     set_current_to_destination();
-}
+  }
+#endif
 
 #if HAS_CONTROLLERFAN
 

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/Hephestos/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/K8200/Configuration_adv.h

@@ -461,6 +461,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/TAZ4/Configuration_adv.h

@@ -463,6 +463,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/WITBOX/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

@@ -457,6 +457,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -457,6 +457,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -456,6 +456,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -461,6 +461,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -457,6 +457,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25
 

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -455,6 +455,7 @@
 // @section extras
 
 // Arc interpretation settings:
+#define ARC_SUPPORT  // Disabling this saves ~2660bytes
 #define MM_PER_ARC_SEGMENT 1
 #define N_ARC_CORRECTION 25