> Note though that this is not an assert. It just emits a message to
> stderr. Do you think a better error message is appropriate? I'm not
> sure the "some data files may have been removed" is an accurate
> description of the issue. Perhaps something like "Profile data file
> mismatch may indicate corrupt profile data"?

Well, we should figure out why sum_all starts to diverge.  If we had
problems mixing cc1 and cc1plus executions, we should get mismatches in
number of counters.  What happens after the miscompare?

Honza

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