simpliest c++ example

makefile

@@ -1,44 +1,32 @@
 CXX = g++
-ARGS = -std=c++17 
+ARGS = -std=c++17
 BISON = /opt/homebrew/opt/bison/bin/bison
 FLEX = flex
 
 TARGET = build/py2rb
 
-$(TARGET): build/lexer.o build/parser.o build/ParserCtx.o  build/main.o build/config.o
+$(TARGET): build/parser.o build/lexer.o build/main.o
 	$(CXX) $^ -o $@
 
-build/lexer.hpp build/lexer.cpp: src/lexer.l build/parser.hpp build
-	$(FLEX) --header-file=build/lexer.hpp -o build/lexer.cpp src/lexer.l 
+build/parser.cpp build/parser.hpp: src/parser.y | build
+	$(BISON) -d -o build/parser.cpp src/parser.y
 
-build/parser.hpp build/parser.cpp: src/parser.y build
-	$(BISON) -d -v -o build/parser.cpp src/parser.y
+build/lexer.cpp build/lexer.hpp: src/lexer.l build/parser.hpp | build
+	$(FLEX) --header-file=build/lexer.hpp -o build/lexer.cpp src/lexer.l
 
-build/lexer.o: build/lexer.cpp build
-	$(CXX) -c $(ARGS)  $< -o $@
+build/%.o: build/%.cpp
+	$(CXX) -c $(ARGS) $< -o $@
 
-build/parser.o: build/parser.cpp build
-	$(CXX) -c $(ARGS)  $< -o $@
-
-build/ParserCtx.o: src/ParserCtx.cpp build
-	$(CXX) -c $(ARGS)  $< -o $@
-
-build/main.o: src/main.cpp build
-	$(CXX) -c $(ARGS)  $< -o $@
-
-build/config.o: src/config.cpp build
-	$(CXX) -c $(ARGS)  $< -o $@
+build/main.o: src/main.cpp | build
+	$(CXX) -c $(ARGS) $< -o $@
 
 build:
 	mkdir -p build
 
-clean: 
+clean:
 	rm -rf build
 
 run: $(TARGET)
 	$(TARGET)
 
-run_lexer: $(TARGET)
-	$(TARGET) -l
-
 .PHONY: clean run