Using .PCH Files Across Projects in Visual Workbench

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1. Copy the header file into the common directory you want, and then delete it from the individual project directories. When using applications generated by AppWizard, the STDAFX.H file is the same for all applications, so it is a good candidate for a shared precompiled header.
2. For each .CPP file that includes the file being used for precompiled headers, give an explicit path to the header. For example, suppose that the .CPP file contains the following:

         #include "stdafx.h"
   						

   If the new location of the header file is C:\MSVC\CMN_HDR, then this statement should be changed to the following:

         #include "c:\msvc\cmn_hdr\stdafx.h"
   						

   Repeat this step for each project that uses a common header file.
3. For each project, choose Project from the Options menu.
4. Choose the Compiler command button to change the compiler options
5. Choose Precompiled Headers from the Category list box.
6. In the Precompile through Header edit box, enter the complete path of the common headers.
7. Choose Debug Options from the Category list box.
8. Put the bullet on the Full (C7 Compatible) radio-control box. This directs the compiler not to place any of the precompiled header information into the .PDB file, which keeps inconsistency errors from occurring in that file.
9. Choose the "OK" button to accept these changes and then choose the "OK" button again to close the Project Options dialog box.
10. For each project, choose Scan All Dependencies from the Project menu before rebuilding the project so that the compiler will use the new common header file.