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Ccache uses exceptions for both truly exceptional events (such as I/O
error) and non-exceptional events (such as unsupported compiler
arguments). Regardless of the nature of the event, at most one
statistics counter can be incremented.
Improve this by:
- Using nonstd::expected instead of exceptions internally in the main
code flow. This makes the code easier to reason about.
- Adding support for communicating several statistics counter updates
both for success and failure code paths. This is in preparation for
future improvements of statistics related to secondary storage.
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