How to stringify a string which contains a comma?

Question

I want to pass a version string in the compile command:

$ g++ -Wall -D VERSION=\"2013-12-03 02:15:21, commit cb060df\" -o          


        

Answer 1

__VA_ARGS__ must be in each call:

#define _STRINGIZE(...) #__VA_ARGS__
#define STRINGIZE(...) _STRINGIZE(__VA_ARGS__)

Answer 2

You can write the TOSTR_ macro to take variable arguments:

#define TOSTR_(x...) #x
#define STRINGIFY(x) TOSTR_(x)
#define VERSION_STR STRINGIFY(VERSION)

This code has been tested and works on Apple LLVM version 5.0.