Try to suppress the use of clock_gettime on Darwin which apparantly

defines _POSIX_CPUTIME but doesn't support the clock_* functions.

I don't test the value of _POSIX_CPUTIME because the spec merely says
that if it is defined, the CPU-specific timers are available, whereas it
says that _POSIX_TIMERS must be defined and defined to a value greater
than zero. However, this may not work, as the POSIX spec clearly states:

  "If the symbolic constant _POSIX_CPUTIME is defined, then the symbolic
  constant _POSIX_TIMERS shall also be defined by the implementation to
  have the value 200112L."

If this doesn't work, I'll add more hacks for Darwin.

llvm-svn: 171565

llvm/lib/Support/Unix/Process.inc

@@ -69,7 +69,7 @@ static std::pair<TimeValue, TimeValue> getRUsageTimes() {
 }
 
 TimeValue self_process::get_user_time() const {
-#ifdef _POSIX_CPUTIME
+#if _POSIX_TIMERS > 0 && defined(_POSIX_CPUTIME)
   // Try to get a high resolution CPU timer.
   struct timespec TS;
   if (::clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &TS) == 0)