Add makefile

Makefile

@@ -0,0 +1,45 @@
+PREFIX ?= /usr/local
+TARGET ?= lite
+
+OBJ_DIR ?= $(shell pwd)/build
+SRC_DIR := $(shell pwd)/src
+
+SRC_EXT := c
+OBJ_EXT := o
+
+SRCS := $(shell find $(SRC_DIR) -name *.$(SRC_EXT))
+
+SOURCES := $(foreach sname, $(SRCS), $(abspath $(sname)))
+OBJECTS := $(patsubst $(SRC_DIR)/%.$(SRC_EXT), $(OBJ_DIR)/%.$(OBJ_EXT), $(SOURCES))
+
+CC := gcc
+CFLAGS ?=
+LDLAGS ?=
+
+CFLAGS +=-Wall -O3 -g -std=gnu11 -fno-strict-aliasing -Isrc -fPIC
+LDFLAGS +=-lSDL2 -lm
+
+UNAME := $(shell uname -s)
+ifeq ($(UNAME_S),Linux)
+CFLAGS +=-DLUA_USE_POSIX
+endif
+
+all: $(TARGET)
+
+$(TARGET): $(OBJECTS)
+	$(CC) $^ -o $@ $(LDFLAGS)
+
+$(OBJ_DIR)/%$(OBJ_EXT): $(SRC_DIR)/%$(SRC_EXT)
+	mkdir -p $(dir $@)
+	$(CC) -c $(CFLAGS) $< -o $@
+
+clean:
+	-rm -f $(OBJECTS) $(TARGET)
+
+.PHONY: clean
+
+install: all
+	@echo Installing to $(DESTDIR)$(PREFIX) ...
+	@mkdir -p $(DESTDIR)$(PREFIX)/bin/
+	@cp -fp $(TARGET) $(DESTDIR)$(PREFIX)/bin/
+	@echo Complete.

README.md

@@ -35,8 +35,8 @@ You can build the project yourself on Linux with following prerequisites:
 #### Debian/Ubuntu
 
 ```
-sudo apt install libsdl2-dev gcc
-./build.sh
+sudo apt install libsdl2-dev gcc make
+make
 ```
 
 ### Windows

build.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-
+set -x
 cflags="-Wall -O3 -g -std=gnu11 -fno-strict-aliasing -Isrc"
 lflags="-lSDL2 -lm"