[DependencyScan] Correct setup clang VFS for dependency scanning #86104
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Currently, dependency scanner is not reporting the redirecting files that are baked inside swift-frontend for platform support. This causes dependency scanner returns virtual path for those files, and swift-driver/build-system will not be able to correct validate the files on incremental build, causing incremental build to be almost clean builds. This behavior issue is caused by the dependency scanning file system layer inside clang dependency scanner that caches stats. If the redirecting files are created underneath the layer, the real path is lost. This fixes the issue by moving the redirecting files above the caching layer using `-ivfsoverlay` option. In addition to that, this commit also unifies how clang importer and clang dependency scanner initiate the VFS, making the logic much simpler.
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Currently, dependency scanner is not reporting the redirecting files that are baked inside swift-frontend for platform support. This causes dependency scanner returns virtual path for those files, and swift-driver/build-system will not be able to correct validate the files on incremental build, causing incremental build to be almost clean builds.
This behavior issue is caused by the dependency scanning file system layer inside clang dependency scanner that caches stats. If the redirecting files are created underneath the layer, the real path is lost. This fixes the issue by moving the redirecting files above the caching layer using
-ivfsoverlayoption.In addition to that, this commit also unifies how clang importer and clang dependency scanner initiate the VFS, making the logic much simpler.