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Editorial Team
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Asked: 2026-05-15T14:18:33+00:00

How can you create a compiler warning (in the model of #error, except as

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How can you create a compiler warning (in the model of #error, except as a warning) on purpose in Visual C++ that will show up on the Error List with the correct file and line number?

GCC and other compilers offer #warning, but the MSVC compiler does not.

The “solution” at http://support.microsoft.com/kb/155196 does not parse in the Visual Studio error list.

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1 Answer

  1. Editorial Team

    Just add this to your common include file (ex, stdafx.h):

    #define __STR2__(x) #x
#define __STR1__(x) __STR2__(x)
#define __LOC__ __FILE__ "("__STR1__(__LINE__)") : warning W0000: #pragma VSWARNING: "
#define VSWARNING(x)  message(__LOC__ x)

    Use this like:

    #pragma VSWARNING("Is this correct?!?!")

    The compiler will output:

    c:\dir\file.h(11) : warning W0000: #pragma VSWARNING: Is this correct?!?!

    And the Error List tab will show the warning nicely in the table: 

    Type       Num   Description                                             File    Line
[Warning]  13    warning W0000: #pragma VSWARNING: Is this correct?!?!   file.h  11

    exactly like a normal Visual Studio compiler warning.

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