Possible to build an IPA file on Linux/Window? Is it possible to build an IPA file with XCode on a non-Mac OS like Windows or (preferably) Linux and preferably without the use of a VM? If yes, what is required to do so?

I did do a basic search and even posted a question on Apple support forum (forums.developer.apple.com/message/11494#11494). I did not find any recent information on this so hence my question hoping you guys would provide faster answer than Apple.
No. 

Building an IPA requires Xcode which requires OS X.