Re-factored sandbox into a single executable

sandbox/Makefile

@@ -1,13 +1,33 @@
-SANDBOX_DIR_LIST := $(filter-out ./include/,$(sort $(dir $(wildcard ./*/.))))
+THIS_FILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
+SANDBOX_PROG_MAKEFILE_PATH := $(abspath $(firstword $(MAKEFILE_LIST)))
+SANDBOX_BASE_DIR := $(patsubst %/,%,$(dir $(THIS_FILE_PATH)))
+SANDBOX_PROG_DIR := $(patsubst %/,%,$(dir $(SANDBOX_PROG_MAKEFILE_PATH)))
+BUILD_DIR := $(SANDBOX_BASE_DIR)/../build/sandbox
 
-all:
+include $(SANDBOX_BASE_DIR)/../tools/make/gcc-host.mk
+EXEC_NAME := sandbox
+DIR_LIST := memblock vm base
+INCLUDE_DIRS := $(foreach dir,$(DIR_LIST),"-I$(dir)/include")
+SRC := $(foreach dir,$(DIR_LIST),$(wildcard $(dir)/*.c))
+OBJ := $(addprefix $(BUILD_DIR)/,$(SRC:.c=.o))
+
+CFLAGS := $(INCLUDE_DIRS) -g
+
+all: $(BUILD_DIR)/$(EXEC_NAME)
 	@for prog in $(SANDBOX_DIR_LIST); do \
 		$(MAKE) -C $$prog; \
 	done
 
-clean:
-	@for prog in $(SANDBOX_DIR_LIST); do \
-		$(MAKE) -C $$prog clean; \
-	done
+$(BUILD_DIR)/$(EXEC_NAME): $(OBJ)
+	@mkdir -p $(@D)
 
-.PHONY: all clean
+	@printf "    \033[1;36mHOSTLD\033[0m \033[1mbuild/sandbox/\033[35m$(EXEC_NAME)\n"
+	@$(CC) $^ -o $@ $(CFLAGS) $(LDFLAGS)
+
+$(BUILD_DIR)/%.o: %.c
+	@printf "    \033[1;32mHOSTCC\033[0m sandbox/$<\n"
+	@mkdir -p $(@D)
+
+	@$(CC) $< -o $@ -c $(CFLAGS)
+
+.PHONY: all