How to detect LLVM and its version through #define directives?

Question

The question is quite clear I think. I\'m trying to write a compiler detection header to be able to include in the application information on which compiler was used and whi

Answer 1

The __llvm__ and __clang__ macros are the official way to check for an LLVM compiler (llvm-gcc or clang) or clang, respectively.

__has_feature and __has_builtin are the recommended way of checking for optional compiler features when using clang, they are documented here.

Note that you can find a list of the builtin compiler macros for gcc, llvm-gcc, and clang using:

echo | clang -dM -E -

This preprocesses an empty string and spits out all macros defined by the compiler.