You may receive a "warning LNK4018" warning message when you link a debug version of your application in Visual C++ (146866)
The information in this article applies to:
- Microsoft Visual C++ 4.0
- Microsoft Visual C++ 4.1
- Microsoft Visual C++, 32-bit Enterprise Edition 4.2
- Microsoft Visual C++, 32-bit Enterprise Edition 5.0
- Microsoft Visual C++, 32-bit Enterprise Edition 6.0
- Microsoft Visual C++, 32-bit Professional Edition 4.2
- Microsoft Visual C++, 32-bit Professional Edition 5.0
- Microsoft Visual C++, 32-bit Professional Edition 6.0
- Microsoft Visual C++, 32-bit Learning Edition 6.0
- Microsoft Visual C++ 2005 Express Edition
- Microsoft Visual C++ .NET (2003)
- Microsoft Visual C++ .NET (2002)
This article was previously published under Q146866 SYMPTOMS When linking a debug version of your application, you may
get the following warning message: LINK : warning
LNK4018: too many type indexes in PDB "filename", discarding subsequent type
information NOTE: You will not be able to see the subsequent types in the
debugger. CAUSE The number of type indexes in the Program Database File
(.pdb file) for your project exceeded 64K for Visual C++ 4.x and 16M for later
versions. This is a limitation of the debugging format in a .pdb file. The
format uses a 16-bit field to store the number of types. This field was
increased to 24 bits in Visual C++ 5.0. RESOLUTION To avoid this warning, use one or more of the following
methods to decrease the number of type indexes in your .pdb file: - Compile modules that you do not need to debug, without
debugging information.
- Break your project into multiple Dynamic Link Libraries
(DLLs). You can use subprojects in Developer Studio to build the new libraries.
- Use the compile time option /Yd. It will cause the type information for only those symbols that
are referenced to be generated. This slows down builds somewhat but may lower
the total number of symbols below the 64K limit.
STATUS This behavior is by design. MORE INFORMATION You can review each object module to determine how many
symbols it contains by using dumpbin /headers <file>.obj. The first
section in the output tells how many symbols the object module contains.
With the introduction of Visual C++ 4.0, the size of the MFC
libraries increased significantly and debugging information for the C run-time
(CRT) libraries is now included in debug builds. These changes will increase
the total number of type indexes in your project's .pdb file from earlier
versions of Visual C++.
| Modification Type: | Major | Last Reviewed: | 1/11/2006 |
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| Keywords: | kbprb kbusage KB146866 kbAudDeveloper |
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