.PHONY: build/exe
SDL_FLAGS=`pkg-config sdl2 SDL2_image --cflags --libs`
FLAGS=-pthread -std=c++11 $(SDL_FLAGS) -Wall -Wextra
CC=g++ $(FLAGS)
CC_STATIC=$(CC) -fPIC
CC_SHARED=g++ -shared
CUR_DIR=$(shell pwd)

# get list of '.o' files to be generated for 'build/include/libxsdl.so' target
XSDL_O_FILES=$(shell ls -l xSDL/*.cpp | awk '{print $$NF}' | sed 's/^xSDL\/\(.\+\)\.cpp$$/build\/static\/\1.o/g')

prepare:
	test -d build/ || mkdir build/
	test -d build/static || mkdir build/static
	test -d build/include || mkdir build/include

clean:
	test -d build/ && rm -r build/ || true

run:
	LD_LIBRARY_PATH="$(CUR_DIR)/build/include/:$LD_LIBRARY_PATH" ./build/exe;

# build executable
build/exe: build/main.o build/include/libxsdl.so
	$(CC) -L$(CUR_DIR)/build/include/ -o $@ $< -lxsdl

# xSDL lib static objects
build/static/%.o: xSDL/%.cpp
	$(CC_STATIC) -c $^ -o $@

# xSDL shared (dynamic) library
build/include/libxsdl.so: $(XSDL_O_FILES)
	$(CC_SHARED) -Wl,-soname,libxsdl.so -o $@ $^

# xMario lib
build/xMario.o: xMario/*.cpp
	$(CC) -o $@ $^

# build main
build/main.o: main.cpp
	$(CC) -o $@ -c $^