Is it possible to read a file at compile time?

Question

I am wondering if it is possible in C++11/14 to actually read files at compile time. For example the following code will only compile if it can successfully read the file.

Answer 1

#define STR(x) #x

const char* a =
{ 
#include "foo.glsl" 
};

and foo.glsl should enclose its content in STR( ... )

upd. This will properly handle commas

#define STRINGIFY(...) #__VA_ARGS__
#define STR(...) STRINGIFY(__VA_ARGS__)