Makefile uppercase/lower case conversion

gistfile1.txt

ORIGINAL_IP=Nrv32Sig
TARGET_IP=ssctrL

ORIGINAL_IP_LOWER  = $(shell echo $(ORIGINAL_IP) | tr '[:upper:]' '[:lower:]')
TARGET_IP_LOWER    = $(shell echo $(TARGET_IP) | tr '[:upper:]' '[:lower:]')
ORIGINAL_IP_UPPER  = $(shell echo $(ORIGINAL_IP) | tr  '[:lower:]' '[:upper:]')
TARGET_IP_UPPER    = $(shell echo $(TARGET_IP) | tr  '[:lower:]' '[:upper:]')


debug:
	@echo "ORIGINAL_IP       " $(ORIGINAL_IP)
	@echo "TARGET_IP         "   $(TARGET_IP)
	@echo "ORIGINAL_IP_LOWER " $(ORIGINAL_IP_LOWER)
	@echo "TARGET_IP_LOWER   "   $(TARGET_IP_LOWER)
	@echo "ORIGINAL_IP_UPPER " $(ORIGINAL_IP_UPPER)
	@echo "TARGET_IP_UPPER   "   $(TARGET_IP_UPPER)