| title | _DEBUG | Microsoft Docs | ||
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| ms.custom | |||
| ms.date | 11/04/2016 | ||
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| ms.topic | conceptual | ||
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| ms.assetid | a9901568-4846-4731-a404-399d947e2e7a | ||
| author | corob-msft | ||
| ms.author | corob | ||
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The compiler defines _DEBUG when you specify the /MTd or /MDd option. These options specify debug versions of the C run-time library.
For more information, see CRT Debugging Techniques.