The command line compile process uses busybox on windows systems.

tenbaht · tenbaht · commit a33a0278de0a · 2018-12-11T11:50:12.000+01:00
Just busybox and a make binary is enough now, no need for a full set of
msys2 tools anymore.
diff --git a/sduino/Arduino.mk b/sduino/Arduino.mk
@@ -1136,6 +1136,10 @@ ifneq (,$(findstring AVR,$(shell $(SIZE) --help)))
     # and the elf to get nice output.
     avr_size = $(SIZE) $(SIZEFLAGS) --format=avr $(1)
     $(call show_config_info,Size utility: AVR-aware for enhanced output,[AUTODETECTED])
+else ifneq (,$(findstring map,$(shell $(SIZE) --help)))
+    # We have a script for SDCC. pass it the map file instead of the hex file
+    avr_size = $(SIZE) $(2:ihx=map)
+    $(call show_config_info,Size utility: SDCC compatible script,[AUTODETECTED])
 else
     # We have a plain-old binutils version - just give it the hex.
     avr_size = $(SIZE) $(2)
diff --git a/sduino/sduino.mk b/sduino/sduino.mk
@@ -65,8 +65,9 @@ ifeq ($(OS),Windows_NT)
         # for Windows always assume the tools to be in this dir tree
         SDCC_PATH := $(ARDUINO_DIR)/hardware/sduino/tools/sdcc/bin
     endif
-#    SHELL := $(ARDUINO_DIR)/hardware/sduino/tools/win/dash
-    SHELL := dash
+    SHELL := $(ARDUINO_DIR)/hardware/sduino/tools/win/busybox.exe
+    .SHELLFLAGS=ash -c
+    SIZE := $(ARDUINO_DIR)/hardware/sduino/tools/wrapper/sdsize.sh
 #    PATH  := $(realpath $(ARDUINO_DIR)/hardware/sduino/tools/win):$(PATH)
 else
     # Linux (and Mac): expect SDCC to be in /opt/sdcc
@@ -81,7 +82,7 @@ OVERRIDE_EXECUTABLES=yes
     CC      = $(SDCC_PATH)/sdcc
     AS      = $(SDCC_PATH)/sdasstm8
     AR      = $(SDCC_PATH)/sdar
-    SIZE    = /usr/bin/size
+    SIZE    ?= /usr/bin/size
 
 
 ARDUINO_SKETCHBOOK	= /tmp	# temporarly, to prevent usage of the real libs
