[Bug bootstrap/50982] gthr reorganization breakage

[dje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982

--- Comment #14 from David Edelsohn <dje at gcc dot gnu.org> 2011-11-04 
14:59:50 UTC ---
AIX /usr/include/sys/types.h refers to pthread_once_t

typedef struct
{
#ifdef __64BIT__
        long    __on_word[9];
#else
        int     __on_word[28];
#endif /* __64BIT__ */
}
pthread_once_t;

also with extern "C" wrapper.