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Update _DEBUG macro reference #5600

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fea358f
Add mention of `/LDd` in `_DEBUG` macro reference
Rageking8 Jul 30, 2025
68fef1a
Add backticks in `_DEBUG` macro reference
Rageking8 Jul 30, 2025
26d3f78
Simplify and add links in `_DEBUG` macro reference
Rageking8 Jul 30, 2025
84740f3
Update metadata in `_DEBUG` macro reference
Rageking8 Jul 30, 2025
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12 changes: 6 additions & 6 deletions docs/c-runtime-library/debug.md
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---
description: "Learn more about: _DEBUG"
title: "_DEBUG"
ms.date: "11/04/2016"
description: "Learn more about: _DEBUG"
ms.date: 11/04/2016
helpviewer_keywords: ["DEBUG macro", "_DEBUG macro"]
ms.assetid: a9901568-4846-4731-a404-399d947e2e7a
---
# `_DEBUG`

The compiler defines `_DEBUG` when you specify the /MTd or /MDd option. These options specify debug versions of the C run-time library.
The compiler defines `_DEBUG` when you specify the [`/MTd`](../build/reference/md-mt-ld-use-run-time-library.md), [`/MDd`](../build/reference/md-mt-ld-use-run-time-library.md), or [`/LDd`](../build/reference/md-mt-ld-use-run-time-library.md) option. These options specify debug versions of the C run-time library.

For more information, see [CRT debugging techniques](./crt-debugging-techniques.md).
For more information, see [CRT debugging techniques](crt-debugging-techniques.md).

## See also

[Control flags](./control-flags.md)
[Control flags](control-flags.md)\
[Predefined macros](../preprocessor/predefined-macros.md)