replaced variable name to CMDEXE from UNAME.

removed the rule that .d files are converted to .P files.

examples/make.mk

@@ -34,7 +34,7 @@ CXX = $(CROSS_COMPILE)g++
 OBJCOPY = $(CROSS_COMPILE)objcopy
 SIZE = $(CROSS_COMPILE)size
 MKDIR = mkdir
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 CP = copy
 RM = del
 else

examples/rules.mk

@@ -81,7 +81,7 @@ uf2: $(BUILD)/$(BOARD)-firmware.uf2
 OBJ_DIRS = $(sort $(dir $(OBJ)))
 $(OBJ): | $(OBJ_DIRS)
 $(OBJ_DIRS):
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 	@$(MKDIR) $(subst /,\,$@)
 else
 	@$(MKDIR) -p $@
@@ -111,15 +111,6 @@ vpath %.c . $(TOP)
 $(BUILD)/obj/%.o: %.c
 	@echo CC $(notdir $@)
 	@$(CC) $(CFLAGS) -c -MD -o $@ $<
-ifneq ($(UNAME),Windows)
-	@# The following fixes the dependency file.
-	@# See http://make.paulandlesley.org/autodep.html for details.
-	@# Regex adjusted from the above to play better with Windows paths, etc.
-	@$(CP) $(@:.o=.d) $(@:.o=.P); \
-	  $(SED) -e 's/#.*//' -e 's/^.*:  *//' -e 's/ *\\$$//' \
-	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:.o=.d) >> $(@:.o=.P); \
-	  $(RM) $(@:.o=.d)
-endif
 
 # ASM sources lower case .s
 vpath %.s . $(TOP)
@@ -140,7 +131,7 @@ size: $(BUILD)/$(BOARD)-firmware.elf
 
 .PHONY: clean
 clean:
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 	rd /S /Q $(subst /,\,$(BUILD))
 else
 	$(RM) -rf $(BUILD)

hw/bsp/adafruit_clue/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/arduino_nano33_ble/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/circuitplayground_bluefruit/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/feather_nrf52840_express/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/feather_nrf52840_sense/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/itsybitsy_nrf52840/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/nrf52840_mdk_dongle/board.mk

@@ -13,7 +13,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/pca10056/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/pca10059/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/pca10100/board.mk

@@ -14,7 +14,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

hw/bsp/raytac_mdbt50q_rx/board.mk

@@ -13,7 +13,7 @@ CFLAGS += -Wno-error=undef -Wno-error=unused-parameter -Wno-error=cast-align
 
 # due to tusb_hal_nrf_power_event
 GCCVERSION = $(firstword $(subst ., ,$(shell arm-none-eabi-gcc -dumpversion)))
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 ifeq ($(shell if $(GCCVERSION) geq 8 echo 1), 1)
 CFLAGS += -Wno-error=cast-function-type
 endif

tools/top.mk

@@ -2,10 +2,10 @@ ifneq ($(lastword a b),b)
 $(error This Makefile require make 3.81 or newer)
 endif
 
-# Detect windows or not
+# Detect whether shell style is windows or not
 # https://stackoverflow.com/questions/714100/os-detecting-makefile/52062069#52062069
 ifeq '$(findstring ;,$(PATH))' ';'
-UNAME := Windows
+CMDEXE := 1
 endif
 
 # Set TOP to be the path to get from the current directory (where make was
@@ -15,14 +15,14 @@ endif
 THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
 TOP := $(patsubst %/tools/top.mk,%,$(THIS_MAKEFILE))
 
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 TOP := $(subst \,/,$(shell for %%i in ( $(TOP) ) do echo %%~fi))
 else
 TOP := $(shell realpath $(TOP))
 endif
 #$(info Top directory is $(TOP))
 
-ifeq ($(UNAME),Windows)
+ifeq ($(CMDEXE),1)
 CURRENT_PATH := $(subst $(TOP)/,,$(subst \,/,$(shell echo %CD%)))
 else
 CURRENT_PATH := $(shell realpath --relative-to=$(TOP) `pwd`)