Make dynamic library work on macos

sdlpp/Makefile

@@ -1,12 +1,24 @@
 CXX ?= g++
 CPPFLAGS = -std=c++14 -Wall -Wextra -pedantic
-LIBRARYFLAGS = -fPIC
 
 MAJOR ?= 1
 MINOR ?= 0
 RELEASE ?= 0
 
+ifeq ($(OS),Windows_NT)
+UNAME_S := Windows
+else
+UNAME_S := $(shell uname -s)
+endif
+
+ifeq ($(UNAME_S),Linux)
 SDLPPLIBRARY = libsdlpp.so.${MAJOR}.${MINOR}.${RELEASE}
+LIBRARYFLAGS = -fPIC
+endif
+ifeq ($(UNAME_S),Darwin)
+SDLPPLIBRARY = libsdlpp.dylib
+LIBRARYFLAGS =
+endif
 
 OBJECTFILES = sdlpp_circlecolider.o sdlpp_circlerenderer.o sdlpp_collision.o sdlpp_common.o sdlpp_font.o sdlpp_linerenderer.o sdlpp_rectcolider.o sdlpp_rectrenderer.o sdlpp_renderer.o sdlpp_renderobject.o sdlpp_scene.o sdlpp_textrenderer.o sdlpp_texture.o sdlpp_window.o
 
@@ -15,13 +27,20 @@ all: ${SDLPPLIBRARY}
 %.o: %.cpp
 	${CXX} ${CPPFLAGS} ${LIBRARYFLAGS} -c $< -o $@
 
+ifeq ($(UNAME_S),Linux)
 ${SDLPPLIBRARY}: ${OBJECTFILES}
 	${CXX} ${CPPFLAGS} -shared -Wl,-soname,libsdlpp.so.${MAJOR}\
 		-o ${SDLPPLIBRARY} $^
 	ln -sf ${SDLPPLIBRARY} libsdlpp.so
 	ln -sf ${SDLPPLIBRARY} libsdlpp.so.${MAJOR}
+endif
+ifeq ($(UNAME_S),Darwin)
+${SDLPPLIBRARY}: ${OBJECTFILES}
+	${CXX} ${CPPFLAGS} -dynamiclib -install_name ${SDLPPLIBRARY}\
+		-current_version ${MAJOR}.${MINOR} $^ -lSDL2 -lSDL2_image -lSDL2_gfx -lSDL2_ttf -o $@
+endif
 
 clean:
-	${RM} *.so* *.o
+	${RM} *.so* *.o *.dylib
 
 .PHONY: all clean test