Chapter 4: update Makefile

Makefile

@@ -1,4 +1,14 @@
+SOURCES = $(shell find ast lexer logger parser -name '*.cpp')
+HEADERS = $(shell find ast lexer logger parser -name '*.h')
+OBJ = ${SOURCES:.cpp=.o}
+CC = llvm-g++
+
+CFLAGS = -g -O3 -stdlib=libc++ -std=c++11 -I llvm/include -I llvm/build/include
+LLVMFLAGS = `/usr/local/Cellar/llvm/3.9.1_1/bin/llvm-config --cxxflags --ldflags --system-libs --libs core`
+
 .PHONY: compile
 
-compile:
-	llvm-g++ -g -O3 -stdlib=libc++ -std=c++11 `/usr/local/Cellar/llvm/3.9.1_1/bin/llvm-config --cxxflags --ldflags --system-libs --libs core` -I llvm/include -I llvm/build/include lexer.cpp -o lexer.out
+compile: ${OBJ}
+
+%.o: %.cpp ${HEADERS}
+	${CC} ${CFLAGS} ${LLVMFLAGS} -c $< -o $@