How to debug a crashing solve?

[David Banas]

Hi all,

Newbie here needs help on best way to debug a crashing solve.

My code:

                dbg("About to run solver...");
                ceres::Solve(options, &problem, &summary);
                dbg("Solver complete.");

I see the first message, but the program crashes before I see the second.

I'm assuming that I should wrap the call to ceres::Solve() in a try/catch block.

What sort of things should I look at, inside my catch block?

Thanks!

-db

[Sameer Agarwal]

try compiling in debug mode.

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[David Banas]

Would that entail using an extra compiler flag, linker flag, both? Which flag(s)?

Also, this code isn't doing what I'd expect:

                dbg("About to run solver...");

                try {
                    ceres::Solve(options, &problem, &summary);
                } catch (exception& e) {
                    dbg(e.what());
                    throw;
                }
                dbg("Solver complete.");

I've confirmed that I am throwing an exception where I think I am (by putting a dbg(...) statement just before the throw(...) statement).

However, I'm not seeing anything in my debug log from that dbg(e.what());

Does a running solver intercept the normal C++ exception handling mechanism?

Thanks,

-db

[Sameer Agarwal]

David, 

The exact flags will depend on your build environment. Do you have a small reproduction that is causing the crash?

Sameer 

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[David Banas]

Hi Sameer,

Thanks for your reply.

I found my bug and fixed it.

-db

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