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Asked: 2026-05-15T04:06:59+00:00

I was looking at some same code (a sample MS Visual Studio C++ project)

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I was looking at some same code (a sample MS Visual Studio C++ project) recently with multiple build configurations (Release/Debug, Win32/x64).

My question: What is the difference? I guess I understand Release/Debug (Release = finalized version of project, Debug = version used to run in debugger), but what things need to be considered when building different versions for Win32/x64 platforms? Is there any coding differences, or does this just affect how that same code is ultimately built into machine code?

I know there are different library files depending on whether you’re using a 32-bit or 64-bit system as well… Are all of these differences again just machine code? Would a 32-bit library file and its corresponding 64-bit library file be two files with exactly the same functions build from the same source code originally, and only differing in their machine code implementation?

Thanks!

–Russel

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  1. Editorial Team

    There can be differences in how the code is written, but with a bit of care most code is pretty easy to write so it compiles and runs fine as either a 32-bit or 64-bit executable. Most of the problems arise when/if you do things like assuming similarity between Windows types (e.g., that a DWORD will hold a pointer — true in 32-bit code but not in 64-bit code).

    Also note that the last few iterations of the 32-bit compiler have had a warning you could enable for code that wouldn’t port to 64-bit execution (and it seems pretty effective and accurate).

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