[LLVMdev] How to identify LLVM version?

[Kangkook Jee]

Hi, all

I'd like to write a code that can build different codes based on LLVM version. 
Like code snippets in the below. 

#ifdef __LLVM_29__
   PHINode *PN = Builder.CreatePHI (Type::getDoubleTy(getGlobalContext()), 2, "iftmp");
#elif __LLVM_28__
   PHINode *PN = Builder.CreatePHI (Type::getDoubleTy(getGlobalContext()), "iftmp");
#else
   assert ("wrong version");
#endif

I've been trying to find something like these (__LLVM_29__, __LLVM_28__), but I couldn't find them yet. 

Thanks for your help. 
Regard, Kangkook