build: add support for building tools targeting host machine

tools/tool-template.mk

@@ -0,0 +1,22 @@
+BUILD_DIR := $(TOOLS_BUILD_DIR)/$(TOOL_NAME)
+
+SRC := $(wildcard *.c)
+OBJ := $(addprefix $(BUILD_DIR)/,$(SRC:.c=.o))
+
+$(BUILD_DIR)/$(TOOL_NAME): $(OBJ)
+	@mkdir -p $(@D)
+
+	@printf "    \033[1;36mHOSTLD\033[0m \033[1mtools/$(TOOL_NAME)\033[0m\n"
+	@$(CC) $< -o $@ $(CFLAGS) $(LDFLAGS)
+
+$(BUILD_DIR)/%.o: %.c
+	@printf "    \033[1;32mHOSTCC\033[0m $(TOOL_NAME)/$^\n"
+	@mkdir -p $(@D)
+
+	@$(CC) $< -o $@ -c $(CFLAGS)
+
+all: $(TOOL_NAME)
+
+clean:
+	@printf "    \033[1;93mRM\033[0m     Deleting sandbox/$(TOOL_NAME)\n"
+	@rm -rf $(BUILD_DIR)