I cant find any mac target in CCPlatformConfig.h,
does it mean the mac is not supported (yet?) by cocos2d-x ?
Yes, it is not supported. You can use simulator to develop.
I m targetting Ipad but releasing on mac with same code would be a great option. Is there a way to support mac target even if it requires some tweaks?
You should implements some classes under platform. You can refer iOS, android and other platforms.
I see what u mean, samples / guidelines / advices are welcomed