TRUE Makefile with automatic clear on mode change

c/tex_parser/Makefile

@@ -16,6 +16,7 @@ TARGET=tex_parser_test
 ifeq ($(mode),)
 	mode = debug
 endif
+
 ifeq ($(mode),debug)
 	CFLAGS = -O0 -g -std=gnu99 -pedantic -Wextra -Wconversion
 	LDFLAGS =
@@ -36,7 +37,7 @@ endif
 CFLAGS += -Wall
 LDFLAGS += -Wall $(LIBRARIES)
 
-all: $(TARGET)
+all: change_build_mode $(TARGET)
 
 ifneq ($(mode),debug)
 ifneq ($(mode),profile)
@@ -55,13 +56,21 @@ endif
 	@echo "LDFLAGS=$(LDFLAGS)"
 	@echo ".........................."
 
+OLD_BUILD_MODE=$(shell cat build_mode.out 2>/dev/null)
+change_build_mode:
+ifneq ($(mode), $(OLD_BUILD_MODE))
+	@echo CLEANING...
+	@make clean &>/dev/null
+	@echo $(mode) > build_mode.out
+endif
+
 %.o :
 	$(CC) -c $(CFLAGS) $(INCLUDE) -o $@ $<
 
 clean:
 	$(RM) *.o *.out callgrind.out.* *.gcno $(TARGET)
 
-.PHONY: all clean
+.PHONY: all change_build_mode clean
 
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