wristow added a comment. To check for whether we're in "generate a PCH file mode", I added a new flag (`GeneratePCHMode`) to `PreprocessorOptions`. If the `CompilerInstance` had been visible in lexical analysis, it would have been easy to do this without adding a new flag. Is there a better way to determine whether Clang is generating a PCH file? One alternative approach considered was to put a reference to `FrontendOptions` into the `Preprocessor` class (it already includes a reference to `LangOpts`, for example).
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