How to: Reduce the Size of an MFC Debug Build
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The debug information for a large MFC application can take up a lot of disk space.
To reduce the size of debug information
Rebuild the MFC libraries using the /Z7, /Zi, /ZI (Debug Information Format) option, instead of /Z7. These options build a single program database (PDB) file that contains debug information for the entire library, reducing redundancy and saving space.
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Rebuild the MFC libraries without debug information (no /Z7, /Zi, /ZI (Debug Information Format) option). In this case, the lack of debug information will prevent you from using most debugger facilities within the MFC library code, but because the MFC libraries are already thoroughly debugged, this may not be a problem.
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Build your own application with debug information for selected modules only. For more information, see How to: Build an MFC Application with Debug Information for Selected Modules.