V3.18.0 breaks Qt precompiled headers

The attached project builds properly when configured from a 'VS' subdirectory using

cmake .. -G "Visual Studio 16 2019" -A x64

... in CMake v3.16.2, but when used with v3.18.0 it fails on compilation with the error:

C:\Users\stephem\Desktop\CMake3.18ErrorReproducer\VS\CommonPCH_Lib_autogen\mocs_compilation.cpp : fatal error C1083: Cannot open precompiled header file: 'C:/Users/stephem/Desktop/CMake3.18ErrorReproducer/VS/CommonPCH_Lib.pch': No such file or directory
2>

(N.B. To try this out yourselves you'll obviously need to change the definition of CMAKE_PREFIX_PATH given in CMakeLists.txt to point it to your own installation of Qt).

Edited Jul 16, 2020 by Brad King

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