StackOverflow2013

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2013-10-25T23:09:26.570
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You seem to be hung up on finding the iteration on which it breaks, but the answer from <a href="https://stackoverflow.com/users/126769/nos">nos</a>, above, clearly states how to do this. Run your program in GDB, wait for the code to crash (at which point GDB will grab it), and then work out which iteration it's crashed in by printing the value of the index variable using <code>print i</code> at the GDB prompt. Edit: Ok, I think I understand. When you say the code "breaks", you mean it's breaking in such a way that allows it to continue to be executed: it's not crashing, and GDB isn't automatically catching it. In this case, there's no way to determine where to set the breakpoint you want. You simply don't know when the problem is occurring. How are you determining that the program is breaking? Are there any variables you could print the value of to show when the breakage occurs? If so, you could have GDB print the values during each iteration (rather than writing debug directly into the code). You can do this using the <code>commands</code> option. There's an example of how to do this in <a href="https://stackoverflow.com/questions/10748501/automating-gdb-sessions">this</a> thread. On each iteration print the value of <code>i</code> and also the value of whichever variable you're using to track the breakage. This should then give you the iteration on which the breakage occurs, and you can go back and set a breakpoint in the right place.
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1. POHow to use GDB inside giant loops
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1. USRichard Horrocks
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