[C/C++] Anonymous field in struct

I have below code and try to bring under unit test with CppUtest in Linux.

typedef union {
  unsigned char Byte;
  struct {
    byte             :1; 
    byte             :1; 
    byte             :1; 
    byte             :1; 
  } Bits;

} foo;

And got compile error: "error: type of bit-field ‘<anonymous>’ is a GCC extension [-pedantic] "  with gcc.

Had a searching and it's said in gcc it's not supported. We can use g++ if we can to compile such kind of code.

See more in http://stackoverflow.com/questions/1972003/how-to-use-anonymous-structs-unions-in-c

Workaround I applied to the makefile is to force CppUtest use g++ for .c files: by adding  CC = g++  in it.