Original release notes
cmake: leave the timestamp out of precompiled headers on clang (#28816)
Clang stores the modification time of the precompiled header sources inside the header and refuses the header when they differ. A cached header restored from another checkout carries the timestamps of that checkout, so the build fails. The option covers the compilers ccache treats as MSVC while they are clang underneath, clang-cl and the Intel LLVM drivers.
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