llvm-project

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# Mimick `GNUInstallDirs` for one more install directory, the one where
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# project's installed cmake subdirs go.
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# These functions are internal functions vendored in from GNUInstallDirs (with
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# new names), so we don't depend on unstable implementation details. They are
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# also simplified to only handle the cases we need.
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#
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# The purpose would appear to be making `CACHE PATH` vars in a way that
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# bypasses the legacy oddity that `-D<PATH>` gets canonicalized, despite
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# non-canonical `CACHE PATH`s being perfectly valid.
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macro(_GNUInstallPackageDir_cache_convert_to_path var description)
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  get_property(_GNUInstallPackageDir_cache_type CACHE ${var} PROPERTY TYPE)
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  if(_GNUInstallPackageDir_cache_type STREQUAL "UNINITIALIZED")
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    file(TO_CMAKE_PATH "${${var}}" _GNUInstallPackageDir_cmakepath)
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    set_property(CACHE ${var} PROPERTY TYPE PATH)
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    set_property(CACHE ${var} PROPERTY VALUE "${_GNUInstallPackageDir_cmakepath}")
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    set_property(CACHE ${var} PROPERTY HELPSTRING "${description}")
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    unset(_GNUInstallPackageDir_cmakepath)
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  endif()
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  unset(_GNUInstallPackageDir_cache_type)
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endmacro()
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# Create a cache variable with default for a path.
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macro(_GNUInstallPackageDir_cache_path var default description)
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  if(NOT DEFINED ${var})
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    set(${var} "${default}" CACHE PATH "${description}")
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  endif()
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  _GNUInstallPackageDir_cache_convert_to_path("${var}" "${description}")
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endmacro()
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_GNUInstallPackageDir_cache_path(CMAKE_INSTALL_PACKAGEDIR "lib${LLVM_LIBDIR_SUFFIX}/cmake"
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  "Directories containing installed CMake modules (lib/cmake)")
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