Function strchr

include/string.h:298–308

#  if __has_builtin(__builtin_strchr)
builtin_function(strchr) FAR char *strchr(FAR const char *s, int c)
{
  if (__builtin_constant_p(s))
    {
      return __builtin_strchr(s, c);
    }
  else
    {
      return __orig_strchr(s, c);
    }
}
#  endif

#  if __has_builtin(__builtin_strcmp)