libcxxrt: Fix diagnostics for derived classes
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Authored by emaste on Jun 24 2026, 3:23 PM.

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theraven
dim

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rGfe0d7d6ba549: libcxxrt: Fix diagnostics for derived classes
rGab1af7bd2f42: libcxxrt: Fix diagnostics for derived classes
rG3a5c2899fc7b: libcxxrt: Fix diagnostics for derived classes

Summary

In terminate_with_diagnostics the cast_to arguments were swapped, so it
always failed.  The diagnostic handler produced output like "Terminating
due to uncaught exception 0x24891e08000 of type std::runtime_error".
Now e->what() will actually be included in the output, e.g. "Terminating
due to uncaught exception 0x2bba49208000 'Model file doesn't exist' of
type std::runtime_error".

Event:          Halifax Hackathon 202606
Sponsored by:   The FreeBSD Foundation

Also to be upstreamed.

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rG FreeBSD src repository

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emaste requested review of this revision.Jun 24 2026, 3:23 PM

emaste created this revision.

Hm, I remember something similar occurring when I was attempting to debug that std::ios ABI issue. This would also throw some exceptions during initialization, and it resulted in strange messages from libcxxrt. I didn't have the time then to investigate, but it could very well have been this issue.!

This revision is now accepted and ready to land.Jun 24 2026, 5:01 PM

Closed by commit rG3a5c2899fc7b: libcxxrt: Fix diagnostics for derived classes (authored by emaste). · Explain WhyJun 24 2026, 5:36 PM

This revision was automatically updated to reflect the committed changes.

emaste added a commit: rG3a5c2899fc7b: libcxxrt: Fix diagnostics for derived classes.

Herald added a subscriber: imp. · View Herald TranscriptJun 24 2026, 5:36 PM

Please can you submit this upstream as well?

emaste added a commit: rGab1af7bd2f42: libcxxrt: Fix diagnostics for derived classes.Jul 10 2026, 2:01 AM

emaste added a commit: rGfe0d7d6ba549: libcxxrt: Fix diagnostics for derived classes.