Microsoft KB Archive/163369

= FIX: LDd Suppresses Implicit Definition of _DEBUG =

Article ID: 163369

Article Last Modified on 12/10/2003

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APPLIES TO


 * Microsoft Visual C++ 4.0 Standard Edition
 * Microsoft Visual C++ 4.1 Subscription
 * Microsoft Visual C++ 4.2 Enterprise Edition
 * Microsoft Visual C++ 5.0 Enterprise Edition
 * Microsoft Visual C++ 6.0 Enterprise Edition
 * Microsoft Visual C++ 4.2 Professional Edition
 * Microsoft Visual C++ 5.0 Professional Edition
 * Microsoft Visual C++ 6.0 Professional Edition
 * Microsoft Visual C++ 6.0 Standard Edition

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This article was previously published under Q163369



SYMPTOMS
When compiler option /LDd follows /MTd, /MDd or /MLd, _DEBUG is not defined. This happens only if it is compiled from the command line. The IDE adds this definition by default in the project settings for debug build.



RESOLUTION
Specify /LDd before /MTd, /MDd or /MLd.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This problem was corrected in Microsoft Visual C++ .NET.



MORE INFORMATION
When you use one of the compiler options /MTd, /MDd or /MLd, the symbol _DEBUG is automatically defined. However, if /LDd follows any of these options on the compiler command line, then _DEBUG is not defined automatically.

Steps to Reproduce Behavior
// x.cpp or x.c   // Compile options needed to reproduce: /c /MTd /LDd // Compile options for workaround: /c /LDd /MTd #ifdef _DEBUG # pragma message("_DEBUG is defined") #else # pragma message("_DEBUG is not defined") #endif

Keywords: kbbug kbfix kbnoupdate kbcompiler KB163369

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