Describe the bug

• llvm-config sees LLVM’s root directory as <vcpkg path>/packages/llvm_x64-windows-static/tools
• i.e. the command llvm-config --includedir incorrectly returns the value <vcpkg path>/packages/llvm_x64-windows-static/tools/include
• The following also return incorrect values:
  • llvm-config --libdir
  • llvm-config --bindir
  • llvm-config --obj-dir
  • etc.
• See https://releases.llvm.org/8.0.0/docs/CommandGuide/llvm-config.html for a complete list of flags

Environment

• OS: tested on Windows and macOS (probably applies to Linux as well)
• Compiler: revision current

To Reproduce
Steps to reproduce the behavior:

1. vcpkg install llvm:x64-windows-static
   • llvm:x64-osx on macOS
   • takes several hours to build
2. cd packages/llvm_x64-windows-static/tools/llvm
3. llvm-config --includedir

Expected behavior

• llvm-config should see its root directory as <vcpkg path>/packages/llvm_x64-windows-static
• i.e. llvm-config --includedir should return <vcpkg path>/packages/llvm_x64-windows-static/include

Failure logs
None

Additional context
vcpkg currently uses the option -DLLVM_TOOLS_INSTALL_DIR=tools/llvm to set the install directory. I’m not sure if LLVM even has options to set include, lib, etc. directories.