Q195386: PRB: C4786 After Porting from Version 5.0 to Version 6.0

Article: Q195386
Product(s): Microsoft C Compiler
Version(s): WINNT:6.0
Operating System(s): 
Keyword(s): kbCompiler kbSTL kbVC600
Last Modified: 17-JUL-2001

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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 
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SYMPTOMS
========

When building a project with Visual C++ 6.0 that compiles without a C4786
warning in Visual C++ 5.0, you may receive C4786 warnings, sometimes followed
by:

  Fatal Error C1033: cannot open program database 'vc60.pdb'.

RESOLUTION
==========

In Visual C++ 5.0, using the following

     #pragma warning (disable : 4786)

after including STL headers, disables the warning:

  C4786:'identifier' : identifier was truncated to 'number' characters in the
  debug information.

However, this method does not disable all such warnings in Visual C++ version
6.0. The occurrence of many C4786 warnings may result in the following:

  C1033 error: cannot open program database 'vc60.pdb'.

Use the pragma directive before you include any STL headers to disable the
warnings.

STATUS
======

This behavior is by design.

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

Steps to Reproduce Behavior
---------------------------

     // compile options required: /Zi /GX
     #include <iostream>
     #include <string>
     #include <map>

     // move this pragma before the includes above to disable the
     //C4786 warnings
     #pragma warning (disable : 4786)

     int main () {
        using namespace std;
        map<int,string> m;
        m[0] = "hello world";
        cout << m[0] << endl;

        return 0;
     }

REFERENCES
==========

For additional information, please see the following articles in the Microsoft
Knowledge Base:

  Q122539 BUG: C4786 or C1067 Caused by Long Identifier and /Zi

  Q167355 BUG: C4786 Warning Is Not Disabled with #pragma Warning

Additional query words: kbDSupport

======================================================================
Keywords          : kbCompiler kbSTL kbVC600 
Technology        : kbVCsearch kbAudDeveloper kbVC32bitSearch kbVCPE600 kbVCEE600 kbVCLE600
Version           : WINNT:6.0
Issue type        : kbprb

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