[LNT] Update timeit.sh to have the same return code as timeit when --append-exitstatus is used

[sbaranga]

Summary

When passing --append-exitstatus, timeit will write the exit status
to the output and return 0 (with some exceptions in some edge cases).
The exit status will then be checked as part of the output with fpcmp.

We need timeit.sh to do the same (otherwise we will wrongly record a
failure for some tests).

[jmolloy]

LGTM!

[sbaranga]

Thanks, r269912.

-Silviu

tools/timeit.sh

if [ "$OUTPUT" = "$ERRPUT" ]; then
   perf stat -o $PERFSTAT $@ < $INPUT >& $OUTPUT
 else
   perf stat -o $PERFSTAT $@ < $INPUT > $OUTPUT 2> $ERRPUT
 fi
 
 EXITCODE=$?
 if [ "$APPEND_STATUS" = "1" ]; then
   echo "exit $EXITCODE" >> $OUTPUT
+  # When --append-exitstatus is used, timeit will append the
+  # exit status to the output file and return 0. Model this
+  # behaviour here.
+  EXITCODE=0
 fi
 
 echo exit $EXITCODE > $REPORT
 awk -F' ' '{if ($2 == "task-clock") print "user",$1/1000; else if($2 =="seconds") print "real",$1;}' $PERFSTAT >> $REPORT
 
 exit $EXITCODE