BUG: You receive a "fatal error C1852" error message when combining compiler switches /Yc and /Yu with the /YX option in Visual C++

   fatal error C1852: <PCH_file_name> is not a valid precompiled
      header file
   Error executing cl.exe.
					

MORE INFORMATION

Steps to Reproduce Problem

This problem can be demonstrated using the SCRIBBLE, step 7, project; it uses the /Yc and /Yu switches.

1. Add a new C++ (.cpp) source file to the project.
2. In the Project Settings dialog box for the new file, select the C/C++ tab and the Precompiled Headers category.
3. Click the Automatic Use of Precompiled Headers box.
4. Choose the OK button at the bottom of the Project Settings dialog box.

When the build engine processes the newly added source file, it will rebuild the default PCH file. Compilation of the next source file that depends on the default PCH file will fail because the default PCH file no longer matches up to the original sources. The C1852 error listed in the SYMPTOMS section above will be generated.

NOTE: If the source file added to the SCRIBBLE project is a C source file, not a C++ source, the error build error generated will be as follows: