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Asked: 2026-05-12T14:06:45+00:00

I have a C++ program (GCC) and when I add one or more int

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I have a C++ program (GCC) and when I add one or more int members to an abstract base class, the program starts crashing. In the case I’ve examined, it seems that by adding this member, a member in a derived class quits getting initialized (or gets stomped on at some point). If I add more members, it starts (not) working different. This is all really odd because the member is never used anywhere. I can comment out that one line and the program recompile just fine and runs without error.

The whole program is ~3KLOC and would be very hard to strip down.

I’m totally at a loss as to where to start looking. Any Ideas?

Update

I found the issue: free-ing malloc-ed memory and delete-ing new-ed memory is not safe in the same program.

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1 Answer

  1. Editorial Team

    Off the top of my head, without seeing any code (see comments on your question) I would suggest a rogue pointer which normally stomps on something you don’t notice, but introducing a new member makes it stomp on something you do notice.

    Try adding members of different sizes, or more (unused) int members, or maybe a string in the form: const char xxx[50]; to reserve more space.

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