[all-commits] [llvm/llvm-project] 4f6174: [clang] support relative roots to vfs overlays

[Richard Howell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4f61749e16f63b0c9ebd9bdd1f8bf4f570a31692
      https://github.com/llvm/llvm-project/commit/4f61749e16f63b0c9ebd9bdd1f8bf4f570a31692
  Author: Richard Howell <rhow at fb.com>
  Date:   2022-01-19 (Wed, 19 Jan 2022)

  Changed paths:
    A clang/test/VFS/Inputs/vfsoverlay-root-relative.yaml
    A clang/test/VFS/vfsoverlay-relative-root.c
    M llvm/include/llvm/Support/VirtualFileSystem.h
    M llvm/lib/Support/VirtualFileSystem.cpp
    M llvm/unittests/Support/VirtualFileSystemTest.cpp

  Log Message:
  -----------
  [clang] support relative roots to vfs overlays

This diff adds support for relative roots to VFS overlays. The directory root
will be made absolute from the current working directory and will be used to
determine the path style to use. This supports the use of VFS overlays with
remote build systems that might use a different working directory for each
compilation.

Reviewed By: benlangmuir

Differential Revision: https://reviews.llvm.org/D116174