Ability to disable M32

Marlin/src/gcode/gcode.cpp

         case 28: M28(); break;                                    // M28: Start SD write
         case 29: M29(); break;                                    // M29: Stop SD write
         case 30: M30(); break;                                    // M30 <filename> Delete File
-        case 32: M32(); break;                                    // M32: Select file and start SD print
+
+        #if HAS_MEDIA_SUBCALLS
+          case 32: M32(); break;                                  // M32: Select file and start SD print
+        #endif
 
         #if ENABLED(LONG_FILENAME_HOST_SUPPORT)
           case 33: M33(); break;                                  // M33: Get the long full path to a file or folder

Marlin/src/gcode/gcode.h

   static void M31();
 
   #if ENABLED(SDSUPPORT)
-    static void M32();
+    TERN_(HAS_MEDIA_SUBCALLS, static void M32());
     TERN_(LONG_FILENAME_HOST_SUPPORT, static void M33());
     #if BOTH(SDCARD_SORT_ALPHA, SDSORT_GCODE)
       static void M34();

Marlin/src/gcode/sd/M32.cpp

 
 #include "../../inc/MarlinConfig.h"
 
-#if ENABLED(SDSUPPORT)
+#if HAS_MEDIA_SUBCALLS
 
 #include "../gcode.h"
 #include "../../sd/cardreader.h"
   }
 }
 
-#endif // SDSUPPORT
+#endif // HAS_MEDIA_SUBCALLS

Marlin/src/inc/Conditionals_adv.h

   #define HAS_PRINT_PROGRESS 1
 #endif
 
+#if ENABLED(SDSUPPORT) && SD_PROCEDURE_DEPTH
+  #define HAS_MEDIA_SUBCALLS 1
+#endif
+
 #if HAS_PRINT_PROGRESS && EITHER(PRINT_PROGRESS_SHOW_DECIMALS, SHOW_REMAINING_TIME)
   #define HAS_PRINT_PROGRESS_PERMYRIAD 1
 #endif

Marlin/src/sd/cardreader.cpp

 SdVolume CardReader::volume;
 SdFile CardReader::file;
 
-uint8_t CardReader::file_subcall_ctr;
-uint32_t CardReader::filespos[SD_PROCEDURE_DEPTH];
-char CardReader::proc_filenames[SD_PROCEDURE_DEPTH][MAXPATHNAMELENGTH];
+#if HAS_MEDIA_SUBCALLS
+  uint8_t CardReader::file_subcall_ctr;
+  uint32_t CardReader::filespos[SD_PROCEDURE_DEPTH];
+  char CardReader::proc_filenames[SD_PROCEDURE_DEPTH][MAXPATHNAMELENGTH];
+#endif
 
 uint32_t CardReader::filesize, CardReader::sdpos;
 
   #endif
   flag.sdprinting = flag.mounted = flag.saving = flag.logging = false;
   filesize = sdpos = 0;
-  file_subcall_ctr = 0;
+
+  TERN_(HAS_MEDIA_SUBCALLS, file_subcall_ctr = 0);
 
   workDirDepth = 0;
   ZERO(workDirParents);
   switch (subcall_type) {
     case 0:      // Starting a new print. "Now fresh file: ..."
       announceOpen(2, path);
-      file_subcall_ctr = 0;
+      TERN_(HAS_MEDIA_SUBCALLS, file_subcall_ctr = 0);
       break;
 
-    case 1:      // Starting a sub-procedure
+    #if HAS_MEDIA_SUBCALLS
 
-      // With no file is open it's a simple macro. "Now doing file: ..."
-      if (!isFileOpen()) { announceOpen(1, path); break; }
+      case 1:      // Starting a sub-procedure
 
-      // Too deep? The firmware has to bail.
-      if (file_subcall_ctr > SD_PROCEDURE_DEPTH - 1) {
-        SERIAL_ERROR_MSG("Exceeded max SUBROUTINE depth:" STRINGIFY(SD_PROCEDURE_DEPTH));
-        kill(GET_TEXT(MSG_KILL_SUBCALL_OVERFLOW));
-        return;
-      }
+        // With no file is open it's a simple macro. "Now doing file: ..."
+        if (!isFileOpen()) { announceOpen(1, path); break; }
 
-      // Store current filename (based on workDirParents) and position
-      getAbsFilename(proc_filenames[file_subcall_ctr]);
-      filespos[file_subcall_ctr] = sdpos;
+        // Too deep? The firmware has to bail.
+        if (file_subcall_ctr > SD_PROCEDURE_DEPTH - 1) {
+          SERIAL_ERROR_MSG("Exceeded max SUBROUTINE depth:", int(SD_PROCEDURE_DEPTH));
+          kill(GET_TEXT(MSG_KILL_SUBCALL_OVERFLOW));
+          return;
+        }
 
-      // For sub-procedures say 'SUBROUTINE CALL target: "..." parent: "..." pos12345'
-      SERIAL_ECHO_START();
-      SERIAL_ECHOLNPAIR("SUBROUTINE CALL target:\"", path, "\" parent:\"", proc_filenames[file_subcall_ctr], "\" pos", sdpos);
-      file_subcall_ctr++;
-      break;
+        // Store current filename (based on workDirParents) and position
+        getAbsFilename(proc_filenames[file_subcall_ctr]);
 
-    case 2:      // Resuming previous file after sub-procedure
-      SERIAL_ECHO_MSG("END SUBROUTINE");
-      break;
+        TERN_(HAS_MEDIA_SUBCALLS, filespos[file_subcall_ctr] = sdpos);
+
+        // For sub-procedures say 'SUBROUTINE CALL target: "..." parent: "..." pos12345'
+        SERIAL_ECHO_START();
+        SERIAL_ECHOLNPAIR("SUBROUTINE CALL target:\"", path, "\" parent:\"", proc_filenames[file_subcall_ctr], "\" pos", sdpos);
+        file_subcall_ctr++;
+        break;
+
+      case 2:      // Resuming previous file after sub-procedure
+        SERIAL_ECHO_MSG("END SUBROUTINE");
+        break;
+
+    #endif
   }
 
   endFilePrint();
   if (!isMounted()) return;
 
   announceOpen(2, path);
-  file_subcall_ctr = 0;
+  TERN_(HAS_MEDIA_SUBCALLS, file_subcall_ctr = 0);
 
   endFilePrint();
 
 void CardReader::fileHasFinished() {
   planner.synchronize();
   file.close();
-  if (file_subcall_ctr > 0) { // Resume calling file after closing procedure
-    file_subcall_ctr--;
-    openFileRead(proc_filenames[file_subcall_ctr], 2); // 2 = Returning from sub-procedure
-    setIndex(filespos[file_subcall_ctr]);
-    startFileprint();
-  }
-  else {
-    endFilePrint(TERN_(SD_RESORT, true));
 
-    marlin_state = MF_SD_COMPLETE;
-  }
+  #if HAS_MEDIA_SUBCALLS
+    if (file_subcall_ctr > 0) { // Resume calling file after closing procedure
+      file_subcall_ctr--;
+      openFileRead(proc_filenames[file_subcall_ctr], 2); // 2 = Returning from sub-procedure
+      setIndex(filespos[file_subcall_ctr]);
+      startFileprint();
+      return;
+    }
+  #endif
+
+  endFilePrint(TERN_(SD_RESORT, true));
+  marlin_state = MF_SD_COMPLETE;
 }
 
 #if ENABLED(AUTO_REPORT_SD_STATUS)

Marlin/src/sd/cardreader.h

   //
   // Procedure calls to other files
   //
-  #ifndef SD_PROCEDURE_DEPTH
-    #define SD_PROCEDURE_DEPTH 1
+  #if HAS_MEDIA_SUBCALLS
+    static uint8_t file_subcall_ctr;
+    static uint32_t filespos[SD_PROCEDURE_DEPTH];
+    static char proc_filenames[SD_PROCEDURE_DEPTH][MAXPATHNAMELENGTH];
   #endif
-  static uint8_t file_subcall_ctr;
-  static uint32_t filespos[SD_PROCEDURE_DEPTH];
-  static char proc_filenames[SD_PROCEDURE_DEPTH][MAXPATHNAMELENGTH];
 
   //
   // SD Auto Reporting

buildroot/tests/LPC1769-tests

            PRINTCOUNTER NOZZLE_PARK_FEATURE NOZZLE_CLEAN_FEATURE SLOW_PWM_HEATERS PIDTEMPBED EEPROM_SETTINGS INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT \
            Z_SAFE_HOMING ADVANCED_PAUSE_FEATURE PARK_HEAD_ON_PAUSE \
            LCD_INFO_MENU ARC_SUPPORT BEZIER_CURVE_SUPPORT EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES SDCARD_SORT_ALPHA EMERGENCY_PARSER
+opt_disable SD_PROCEDURE_DEPTH
 opt_set GRID_MAX_POINTS_X 16
 exec_test $1 $2 "Smoothieboard with many features"
 

platformio.ini

   -<src/gcode/probe/M951.cpp>
   -<src/gcode/scara>
   -<src/gcode/sd>
+  -<src/gcode/sd/M32.cpp>
   -<src/gcode/temp/M104_M109.cpp>
   -<src/gcode/temp/M155.cpp>
   -<src/gcode/units/G20_G21.cpp>
 G38_PROBE_TARGET        = src_filter=+<src/gcode/probe/G38.cpp>
 MAGNETIC_PARKING_EXTRUDER = src_filter=+<src/gcode/probe/M951.cpp>
 SDSUPPORT               = src_filter=+<src/gcode/sd>
+HAS_MEDIA_SUBCALLS      = src_filter=+<src/gcode/sd/M32.cpp>
 HAS_EXTRUDERS           = src_filter=+<src/gcode/temp/M104_M109.cpp> +<src/gcode/config/M221.cpp>
 AUTO_REPORT_TEMPERATURES = src_filter=+<src/gcode/temp/M155.cpp>
 INCH_MODE_SUPPORT       = src_filter=+<src/gcode/units/G20_G21.cpp>