Argyrios Kyrtzidis c4b5b60d00 [Driver/ClangImporter] Changes for the driver to recognize -pch-output-dir and propagate to the frontend invocations ...

For the multiple-files mode -emit-pch is still invoked in separate frontend invocation but with using a persistent PCH.
Subsequent frontend invocations use the persistent PCH but they don't need to validate it.

For all-files mode (e.g. WMO) the frontend invocation uses a persistent PCH that it also validates.

2017-05-11 11:44:12 -07:00

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