[all-commits] [llvm/llvm-project] 5a8a7e: [llvm][vfs] Preserve paths for fallback/fallthroug...

[Ben Langmuir via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5a8a7ee9d12d7cd3680c7bc14a4750bd44d99c56
      https://github.com/llvm/llvm-project/commit/5a8a7ee9d12d7cd3680c7bc14a4750bd44d99c56
  Author: Ben Langmuir <blangmuir at apple.com>
  Date:   2024-03-15 (Fri, 15 Mar 2024)

  Changed paths:
    M llvm/include/llvm/Support/VirtualFileSystem.h
    M llvm/lib/Support/VirtualFileSystem.cpp
    M llvm/unittests/Support/VirtualFileSystemTest.cpp

  Log Message:
  -----------
  [llvm][vfs] Preserve paths for fallback/fallthrough in RedirectingFileSystem (#85307)

When we lookup in the external filesystem, do not remove . and ..
components from the original path. For .. this is a correctness issue in
the presence of symlinks, while for . it is simply better practice to
preserve the original path to better match the behaviour of other
filesystems. The only modification we need is to apply the working
directory, since it could differ from the external filesystem.

rdar://123655660



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