llvm-project

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# get clang resource directory
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#
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# usage:
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#  get_clang_resource_dir(out_var [PREFIX prefix] [SUBDIR subdirectory])
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#
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# user can use `PREFIX` to prepend some path to it or use `SUBDIR` to
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# get subdirectory under clang resource dir
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function(get_clang_resource_dir out_var)
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  cmake_parse_arguments(ARG "" "PREFIX;SUBDIR" "" ${ARGN})
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  if(DEFINED CLANG_RESOURCE_DIR AND NOT CLANG_RESOURCE_DIR STREQUAL "")
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    set(ret_dir bin/${CLANG_RESOURCE_DIR})
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  else()
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    if (NOT CLANG_VERSION_MAJOR)
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      string(REGEX MATCH "^[0-9]+" CLANG_VERSION_MAJOR ${PACKAGE_VERSION})
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    endif()
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    set(ret_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION_MAJOR})
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  endif()
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  if(ARG_PREFIX)
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    set(ret_dir ${ARG_PREFIX}/${ret_dir})
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  endif()
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  if(ARG_SUBDIR)
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    set(ret_dir ${ret_dir}/${ARG_SUBDIR})
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  endif()
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  set(${out_var} ${ret_dir} PARENT_SCOPE)
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endfunction()
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