Q199057: BUG: Expansion of __LINE__ Macro Is Incorrect When Using /ZI

Article: Q199057
Product(s): Microsoft C Compiler
Version(s): 6.0
Operating System(s): 
Keyword(s): kbCompiler kbVC600bug
Last Modified: 13-FEB-2002

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The information in this article applies to:

- Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 
- Microsoft Visual C++, 32-bit Professional Edition, version 6.0 
- Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
- Microsoft Visual C++.NET (2002) 
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SYMPTOMS
========

The results of the __LINE__ macro are incorrect when you use Debug Information
for Edit and Continue (/ZI). The problem may manifest itself as compiler,
linker, or run-time errors.

RESOLUTION
==========

To work around this problem, use the Program Database option (/Zi) instead of
Edit and Continue (/ZI).

STATUS
======

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

MORE INFORMATION
================

The following sample code demonstrates the problem:

     // TEST.CPP - Compile with /GX and /Zi or /ZI.
     #include <iostream>
     using namespace std;

     #define CONCAT(s1,s2) #s1 ## #s2
     #define MSG(n) cout << CONCAT(Message at line\x20,n) << endl;

     int main()
     {
     MSG(__LINE__);
     return 0;
     }

When compiled with the /Zi option, output is correct:

  Message at line 10

When compiled with the /ZI option, output is incorrect:

  Message at line (__LINE__Var+1)


Additional query words:

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Keywords          : kbCompiler kbVC600bug 
Technology        : kbVCsearch kbAudDeveloper kbVC600 kbVC32bitSearch
Version           : :6.0
Issue type        : kbbug
Solution Type     : kbpending

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