Build: MINGW can be used to build/upload apm hex

mk/board_avr.mk

@@ -85,11 +85,14 @@ HARDWARE_CORE :=	$(shell grep $(BOARD).build.core $(BOARDFILE) | cut -d = -f 2)
 UPLOAD_SPEED :=	$(shell grep $(BOARD).upload.speed $(BOARDFILE) | cut -d = -f 2)
 
 # User can define USERAVRDUDEFLAGS = -V in their config.mk to skip verification
+USERAVRDUDEFLAGS ?= 
 #make sure the avrdude conf file is referenced correctly in cygwin
 ifneq ($(findstring CYGWIN, $(SYSTYPE)),) 
   USERAVRDUDEFLAGS := -C $(ARDUINO)/hardware/tools/avr/etc/avrdude.conf
-else
-  USERAVRDUDEFLAGS ?= 
+endif
+#make sure the avrdude conf file is referenced correctly in mingw
+ifneq ($(findstring MINGW, $(SYSTYPE)),) 
+  USERAVRDUDEFLAGS := -C $(ARDUINO)/hardware/tools/avr/etc/avrdude.conf
 endif
 
 ifeq ($(UPLOAD_PROTOCOL),)

mk/find_tools.mk

@@ -10,19 +10,20 @@ ifeq ($(SYSTYPE),Darwin)
   TOOLPATH :=  $(ARDUINOS)/hardware/tools/avr/bin
   # use BWK awk
   AWK =  awk
+  FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1),$(TOOLPATH))))
 endif
 ifeq ($(SYSTYPE),Linux)
   # expect that tools are on the path
   TOOLPATH :=  $(subst :, ,$(PATH))
+  FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1),$(TOOLPATH))))
 endif
 ifeq ($(findstring CYGWIN, $(SYSTYPE)),CYGWIN) 
   TOOLPATH :=  $(ARDUINO)/hardware/tools/avr/bin
+  FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1).exe,$(TOOLPATH))))
 endif
-
-ifeq ($(findstring CYGWIN, $(SYSTYPE)),) 
-FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1),$(TOOLPATH))))
-else
-FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1).exe,$(TOOLPATH))))
+ifeq ($(findstring MINGW, $(SYSTYPE)),MINGW) 
+  TOOLPATH :=  $(ARDUINO)/hardware/tools/avr/bin
+  FIND_TOOL    =  $(firstword $(wildcard $(addsuffix /$(1).exe,$(TOOLPATH))))
 endif
 
 NATIVE_CXX     :=  g++