[PATCH] D70701: Fix more VFS tests on Windows

[Adrian McCarthy via Phabricator via cfe-commits]

amccarth created this revision.
amccarth added reviewers: rnk, vsapsai, arphaman, Bigcheese.
Herald added subscribers: dexonsmith, hiraditya.
Herald added a project: LLVM.

Since VFS paths can be in either Posix or Windows style, we have to use a more flexible definition of "absolute" path.

The key here is that FileSystem::makeAbsolute is now virtual, and the RedirectingFileSystem override checks for either concept of absolute before trying to make the path absolute by combining it with the current directory.


https://reviews.llvm.org/D70701

Files:
  clang/test/VFS/vfsroot-include.c
  clang/test/VFS/vfsroot-module.m
  clang/test/VFS/vfsroot-with-overlay.c
  llvm/include/llvm/Support/VirtualFileSystem.h
  llvm/lib/Support/VirtualFileSystem.cpp

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