The best option for c/c++ compiler set to XCode ?

I would love to know the best option of compiler being set to XCode which the code we write will be compatible on other platforms when we port some code onto them.

Please take a look at the attached image.

Additional question : What’s the “Compiler Default” refer to ?


Screen Shot 2012-02-09 at 9.27.20 PM.png (25.5 KB)

You must trust that Apple LLVM would be the best choice for iOS, after all, it’s made by Apple.

Is there any possible case that chosen LLVM to develop and put the code to built on PC, or Android (which use another set of compiler) will broken somehow ?

I would believe it will be minor, but better to ask.