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MS VS 2010 C++ project - how to define DEBUG var?

Posted on 2012-12-30
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Last Modified: 2013-04-18
I have project and imported source regex.c

In this source I have
# ifdef DEBUG
.....


How to add this to project in order to get debugging information?

Where it prints?

Sources are attached.
regex.c
xregex.h
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Question by:longjumps
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by:AndyAinscow
ID: 38731122
When you select the DEBUG (as opposed to RELEASE) build then it is already defined for you.
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by:AndyAinscow
ID: 38731125
>>Where it prints?

If you use a TRACE command it prints to the output window (which is in visual studio)
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by:longjumps
ID: 38731186
How to use Trace command?
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by:AndyAinscow
ID: 38731250
eg.
      TRACE(_T("In put your function/class/whatever here"));

or
        TRACE(s);  //s is a string variable, eg with the value of some other variable in it
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by:longjumps
ID: 38732039
The question was related to
# ifdef DEBUG

and in the source I have already debugging printings like
DEBUG_PRINT1 ...

and others.

So the question is how should I compile and run this code in Visual Studio 2010 to see the existing printing and not adding new TRACEs?
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by:AndyAinscow
ID: 38732137
Build it as a debug build (see my original comment).Possibile build choices - Debug and ReleaseDEBUG is defined for you in a debug build
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by:longjumps
ID: 38732167
I don't see "Active Debug".

What should I do?

See attachment.
vs2010-no-active-debug.png
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Expert Comment

by:AndyAinscow
ID: 38732258
In my snapshot there are only two project configurations defined.  Debug and Release.  That show the currently selected (=active) one is debug.
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Author Comment

by:longjumps
ID: 38734073
Dear, if I need something define or add, please advice how.

I simply wants that in the lib code I compile and run get debugging printing, using already existing in the code

# ifdef DEBUG
.....

DEBUG_PRINT1 ...

and others.

I attached lib code to the original question.

Please advice.
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Accepted Solution

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AndyAinscow earned 500 total points
ID: 38734145
The following will define a symbol called DEBUG
#define DEBUG

(but for a debug build it is already defined so you do not need to do anything)


ps.  You can add that line of code to .h files or .cpp files anywhere you wish.  The symbol is only visible to the compiler AFTER it is defined.
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by:longjumps
ID: 38734436
But how to define DEBUG not from code, but compile variable?
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by:AndyAinscow
ID: 38734450
You can't.
It is a compiler directive to modify how code is compiled.
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by:longjumps
ID: 38827232
such precompiler directive should be pass from outside of code by compiler.
in Linux there is something -D<var>  can I do such thing in Win?
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by:AndyAinscow
ID: 38827345
You can define things in the command line to the compiler BUT it is not a variable.  They determine which blocks of code are compiled or not.  (See the project settings).
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by:longjumps
ID: 38884353
checking the solution
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