[PATCH] D126289: [Clang][Driver] Fix include paths for `--sysroot /` on Linux

[Egor Zhdan via Phabricator via cfe-commits]

egorzhdan created this revision.
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Currently if `--sysroot /` is passed to the Clang driver, the include paths generated by the Clang driver will start with a double slash: `//usr/include/...`.
 If VFS is used to inject files into the include paths (for example, the Swift compiler does this), VFS will get confused and the injected files won't be visible.

This change makes sure that the include paths start with a single slash.

Fixes #28283.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126289

Files:
  clang/include/clang/Driver/ToolChain.h
  clang/lib/Driver/ToolChain.cpp
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/lib/Driver/ToolChains/Hurd.cpp
  clang/lib/Driver/ToolChains/Hurd.h
  clang/lib/Driver/ToolChains/Linux.cpp
  clang/lib/Driver/ToolChains/Linux.h
  clang/lib/Driver/ToolChains/WebAssembly.cpp
  clang/lib/Driver/ToolChains/WebAssembly.h
  clang/test/Driver/Inputs/basic_linux_libstdcxx_tree/usr/bin/.keep
  clang/test/Driver/Inputs/basic_linux_libstdcxx_tree/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8/crtbegin.o
  clang/test/Driver/linux-header-search.cpp

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