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When linking a debug version of your application, you may get the following warning message:
NOTE: You will not be able to see the subsequent types in the debugger.
LINK : warning LNK4018: too many type indexes in PDB "filename", discarding subsequent type information
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.
To avoid this warning, use one or more of the following methods to decrease the number of type indexes in your .pdb file:
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++.
Article ID: 146866 - Last Review: February 24, 2014 - Revision: 4.0