[tools-compilers] Unnamed struct and SunStudio12

[Basabi Bhattacharya]

Using SunStudio12 on OpenSolaris (build 128a) and get warnings in unnamed 
struct with -features=extensions

struct xx {
        int y;
};

typedef struct y {
         int z;
} YY;

warning: unnamed struct member
 syntax error before or at: typedef

Not sure why I get error.

Thanks for the help.