[midasuni]

From a standard system upgrade? Never happened to me in 20 years. Between OS versions sure, once every few years spend 20 minutes building from scratch

If it did happen, same as if your machine caught fire. restore from your backup

[xupybd]

For me it's when a library my app uses gets an update then my app fails.

[emteycz]

No need to update the library. Or keep both versions.