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Editorial Team
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Asked: 2026-05-16T18:18:22+00:00

I’d like to pass a MSVC++ 2008 macro into my program via a /D

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I’d like to pass a MSVC++ 2008 macro into my program via a /D define like so

/D__HOME__="\"$(InputDir)\""

then in my program I could do this 

cout << "__HOME__ => " << __HOME__ << endl;

which should print something like

__HOME__ => c:\mySource\Directory

but it doesn’t like the back slashes so I actually get:

__HOME__ => c:mySourceDirectory

Any thoughts on how I could get this to work?

UPDATE: I finally got this to work with Tony’s answer below but note that the $(InputDir) contains a trailing backslash so the actual macro definition has to have an extra backslash to handle it … hackery if ever I saw it! 

/D__HOME__="\"$(InputDir)\\""
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1 Answer

  1. Editorial Team

    You can convert your macro to a string by prefixing it with the stringizing operator #. However, this only works in macros. You actually need a double-macro to make it work properly, otherwise it just prints __HOME__.

    #define STRINGIZE2(x) #x
#define STRINGIZE(x) STRINGIZE2(x)
cout<< "__HOME__ => " << STRINGIZE(__HOME__) << endl;

    Incidentally macros containing double underscores are reserved to the implementation in C++, and should not be used in your program.

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