Added a memusage tool

tools/memusage/makefile

@@ -0,0 +1,42 @@
+CC=gcc
+
+TOY_OUTDIR=out
+
+IDIR+=. ../../source
+CFLAGS+=$(addprefix -I,$(IDIR)) -g -Wall -W -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
+LIBS+=-ltoy
+
+ODIR = obj
+SRC = $(wildcard *.c)
+OBJ = $(addprefix $(ODIR)/,$(SRC:.c=.o))
+OUTNAME=toy
+OUT=../../$(TOY_OUTDIR)/memusage
+
+all:
+	cp $(shell find ../../repl/repl_tools*) .
+	cp $(shell find ../../repl/lib*) .
+	$(MAKE) build
+
+build: $(OBJ)
+	echo $(OBJ)
+ifeq ($(shell uname),Darwin)
+	cp $(PWD)/$(TOY_OUTDIR)/lib$(OUTNAME).dylib /usr/local/lib/
+	$(CC) -DTOY_IMPORT $(CFLAGS) -o $(OUT) $(OBJ) $(LIBS)
+else
+	$(CC) -DTOY_IMPORT $(CFLAGS) -o $(OUT) $(OBJ) -Wl,-rpath,. -L$(realpath $(shell pwd)/../../$(TOY_OUTDIR)) $(LIBS)
+endif
+
+$(OBJ): | $(ODIR)
+
+$(ODIR):
+	mkdir $(ODIR)
+
+$(ODIR)/%.o: %.c
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+.PHONY: clean
+
+clean:
+	$(RM) -r $(ODIR)
+	$(RM) $(shell find ./repl_tools*)
+	$(RM) $(shell find ./lib*)