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Asked: 2026-05-13T16:52:20+00:00

I have an application that only crashes in -O2 optimization (compiled with gcc 4.2.4).

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I have an application that only crashes in -O2 optimization (compiled with gcc 4.2.4). When I step through the code and get to the spot that crashes and try to inspect the value, I get a “value optimized out” in gdb.

I read on the internet that this means that the value is stored in the register. I was wondering if my crash could be related to the fact that some information is placed in registers? Is there a way to print what is in the registers to see if it has been corrupted? Is there a way to keep optimizations but not use registers?

Thanks!

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1 Answer

  1. Editorial Team

    It’s 99% likely to be a bug in your code and 1% likely to be a compiler code generation bug. So spend a proportionate amount of time looking for latent bugs in your code but be aware that you just may have found a code generation bug (in which case you’ll need to study the compiler generated code carefully to see what the problem is).

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